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S509 Alpha Analysis User`s Manual

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1. 3 Plotting all channels 97 Pole zero automatic 14 Polynomial order energy full 29 Populate energy fecal 32 Post NID processing command 90 Power manager Acquisition delay 16 Modesicoe cias rr aia wy ee ee 16 Standby delay 17 Power mode control 16 Preferences Calibration is i e ae ed a a a oa 19 Display oec ea ee ee eee ee aes 60 Preset O as 9 72 Computational 8 72 COUNTS 20 ido ee Ae Rw OB 9 73 119 Intestale va see ge ee Ra Bone eG 8 72 MCS 6 24 28 tse 2 So ee babes 9 73 Sweepcounts 9 73 TIME io ae 8 es We oo Ss ON Ra SE a oe 8 72 Previous group 2 4 112 Print spectrum command 95 PUR control io ccoo a a 14 Reagent correction Critical level test 83 Menucommand 82 Recalculate energy 31 Ref peak function o 30 Reject zero area peaks 79 Report window options 111 Reporting activity units 95 Reporting phase o 94 Resetting the HVPS 15 Resizing the rubber rectangle 57 ROI limits peak area 79 ROIs Adding cer bei ee Ok we ee eB as 59 Automatically adding 59 Deleting 2 0 54 G4 04 hee aw ew as 59 Loading p sy 4 22 Be ee a a 60 SOMME 2 4 Ss a ne e
2. A certificate file is typically used when the NID analysis results are unavailable or are suspect and there is some a priori knowledge about the measured source that is al ready documented in the certificate file Nuclide Library Select the Nuclide Library button to specify a nuclide NLB library as the source of true energies A nuclide library is typically used when the NID analysis results are unavailable or are suspect and there may or may not be some a priori knowledge about the measured source Iteratively selecting likely nuclides and assessing the results until good matches are achieved can sometimes be a successful strategy for empirically determining what nu clide s are evident in the spectrum even when excessive gain shift precludes success ful NID analysis True Energies Nuclide The True Energies list box lists the energies and their associated nuclides in the Source of True Energies you selected By default all of the energies from the NID Analysis Results or from a Certificate File are initially selected none of the energies from a Nu clide Library are initially selected e The Select All button selects all of the listed energies e The Clear button deselects all of the listed energies e Click on a single energy to select or deselect it The Data Plot Data points for all matched peaks are displayed and plotted as True Energy X axis vs Energy Shift Y axis The energy shift plotted at each matched tr
3. Activity Units The selected Activity Unit determines the activity units used for reporting in the Peak Information window 69 Alpha Acquisition and Analysis When you choose one of the standard activity units uCi pCi Bq kBq mBq the cor rect Conversion Factor referenced to 1 uCi is automatically supplied If none of the standard units is acceptable select Other then type a label in the text box and enter the unit s Conversion Factor Analyze Menu The Analyze menu lets you select and execute or abort stop a predefined sequence of analysis phases or a single analysis phase such as Acquisition A phase includes all of the parameters the needed for its successful execution A sequence is a list of phases including the algorithms for a given phase processing parameters required for each algorithm and so forth needed to perform a given set of analyses and generate reports Execute Sequence Select Execute Sequence to see a cascade menu of all currently defined analysis se quences on your system Figure 47 shows the factory installed sequences Selecting one of the sequences will execute it Please refer to Analysis Sequence on page 99 for information on creating and editing a sequence 1 Execute Sequence 2 Auot Sequence amp Acquisition B Peak Locate C Peak Area D Area Correction E Reagent Correction E Efficiency Correction G Nuclide Identification H Detection Limits Figure 47
4. Cancel Abort Help Print Report Now Return to Setup Save Figure 36 Auto Gain Adjust Status Clicking the Cancel Abort button enabled only if a gain adjustment is in progress stops the routine and returns to the setup dialog Any adjustment already performed will only be retained after saving Canceling or closing the setup dialog without saving will cause hardware settings to revert to their original values Print Report Now Only the data from the last iteration is saved to the datasource after leaving the AGA Status window data from previous iterations is not retained To create a record of all iterations click the Print Report Now button Calibrate Return to Setup Save Click the Return to Setup Save button enabled only when a gain adjustment is not in progress to Return to the AGA setup screen where you can Save the current settings and parameters Adjustments are retained only when the Save button in the setup screen is clicked General Information The upper part of the AGA Status screen displays general information about the cur rent AGA session Status current status may be In Progress Completed Successfully or Failed iteration limit reached or communication failure Initiated the date and time when the adjustment was started Acquisition the current live time and preset Iteration the current iteration and iteration limit Gain Shift the current percent gain shift and percent
5. Workspace file This workspace file contains the spe cific datasources detectors and or spectrum files that will be loaded which datasource will be the currently displayed datasource and other display settings Alpha Acquisition and Analysis Select Open Workspace Figure 4 to open a workspace file which will set up the Alpha Acquisition and Analysis AAA window See Workspace Files on page 113 for a detailed description of a workspace file Look in a CAMFILES Edy W Cernipf qws MER DETOL gws File name Files of type Gamma Workspace Files qws y Cancel yy A Figure 4 The Open Workspace Dialog Or you can click on an Alpha Workspace AWS file in Windows Explorer to auto matically start the AAA application and load the selected workspace file Save Workspace Select Save Workspace to save the current workspace file If the workspace file al ready exists you will be asked to confirm that you want to overwrite it Delete Workspace Select Delete Workspace to delete the selected workspace file You will be asked for confirmation before the file is deleted Exit Select Exit to close the Alpha Acquisition and Analysis window You will be asked if you want to save a changed open datasource if it has not already been saved MCA Menu MCA Menu The MCA menu which is available only when the currently selected datasource is a Detector Input contains the set of operations to be performed on
6. When you ve finished select OK to save this as a full CTF certificate file and re turn to the Calibrate by Nuclide List screen You ll see that all nuclides which have Additional Nuclide Information added are marked by a double asterisk If you are satisfied that all data in the Calibrate by Nuclide List screen is correct you can select this screen s OK to load the file into the energy line editor Editing the List When you select OK you ll see the Energy Calibration Full screen which allows you to examine and if necessary edit the data in any of the lines Please refer to En ergy Calibration Full on page 29 for an illustration and explanation of this screen By Calibration File Choosing to calibrate By Calibration File displays a dialog box Figure 20 which lets you select a Calibration File defining the list of energies to be used for calibration Load Calibration File Look in A Calfiles y c Eg E naidemo cal a nbsstd cal sa test cal File name TSS Files oftype Calibration Fies can a a Help I Append to Existing Calibration Info Figure 20 Calibrate by Calibration File 26 Calibrate Info The Info button displays descriptive information for the selected file Append to Existing Calibration When adding energy points to the current datasource from a file such as in construct ing a composite efficiency file there may be common e
7. 8 Starting data acquisition 7 Status HVPS control como css 15 Reporti sas a e iie aa a 17 Status page Marker NfO s usara e 67 Status report Asterisk fe o cca iae aai a e ed eG 17 Clearing an error o 17 Updating ios daa e aa 17 Step contin r e secs sri ssvir iu 20 Stopping data acquisition T Store ROIS 34 c dad a e awada ee ba wo 60 Strip FUNCION es si ke ra e S 106 Super fine gain os s sose o 13 Sweep counts preset oo c cca a ocras resa 9 Tail curve selectionof 20 Template name in analysis reports 94 Time preset pac wee Sete bh 8 72 Tolerance values useof 19 Toolbar setup Preferences 65 TRP preamp setup 15 Type of datasource 4 2 ULD control ADC 10 Unidentified second difference peak locate 73 User specified peak locate 74 V Z VFS Zero AMO oda a G a a ea 57 ADC control oe eina E a e ai 10 Lin at s sea ee ae a A ee E 57 Centroid control o e aas cea are a 12 LOG seg oe e Gh OR tc A ed 57 Mode control ees o eei a e e i 12 Manual c s ea don a b pg eee d 57 Spacing control 020 12 Window control 12 W Workspace file format 113 121 A CANBERRA Warranty Canberra we us our warrants to the customer you your that for a period of ninety 90 days from the date of shipment so
8. IV Real Time Expand Update Spectrum Labels I 2 Ayis Gridline I Anis Ticks Labels IT Axis as Energy I Y Axis Gridline I Y Axis Ticks Labels E Peak Labeling Ascending TF Display Peak Information Nuclide Identification Source Library Lines I Display Nuclide ID on Spectrum De Analysis Result MCA View I MCA only menus Control Panel Shown IV Status Page Shown Toolbar Setup Status Pages Operations I Ask to Save on Clear E Energy Units Ce G kev C MeV C Other Cancel Interactive NID Default Save Help Figure 42 Display Preferences Dialog Save You can Save these preferences so that your display will always be set the way you want it to be In addition to the settings shown on this screen selecting Save will save the display s Scale Type page 57 the chosen Status Pages page 66 and the Report Window s size page 111 Display Menu OK Selecting OK will use the settings only during the current session they will not be saved for future use Default The Default button resets all parameters to the factory default state Edit Colors You can change the displayed colors for the e Spectrum background e Reference Spectrum e Compare Spectra e ROI type e Peak Labels ROI Type Selecting an ROI type by number allows you to select both the color of each type and the type itself For instance selecting type 3 means that all of the
9. ROI then the FWHM Area and estimated Activity is also displayed Operations If Ask to Save on Clear is enabled you Il be asked to save changes when clearing a de tector s spectrum If this option is disabled then the clear will be done unconditionally Display Menu Interactive NID The Interactive NID Setup dialog Figure 46 lets you choose a nuclide library to be used for the Nuclide Identification Source page 63 as well as setting the tolerance for searching that library and the activity units to be used in the Peak Information window Tolerance 7 00 keV Energy C FWHM NID Library C GENIE2K CAMFILES STDLIB NLB Select Activity Units uci C Bq C Other pCi C kBg MBq Conversion factor 1 0 Cancel Help Figure 46 Interactive NID Setup Tolerance This is used to specify the value to be used in deciding if an energy line in the given li brary matches the peak being searched for Energy FWHM The energy units for the Peak Match Tolerance value Choose Energy for a fixed tol erance or FWHM for a variable tolerance Peak Match Enter the Tolerance value for peak matching If you choose Energy Units enter the value in keV If you choose variable the tolerance becomes the number entered multi plied by the FWHM calculated at the energy of the peak NID Library Select the default Nuclide Library to be used when you select Library Lines for the Nuclide Identification Source page 63
10. When the compare spectrum is enabled the VFS scroll bar controls the compare spec trum s scale With the reference spectrum enabled VFS box returned to its original color the VFS scroll bar controls the reference spectrum s scale Off Select Off to disable the compare mode and return to the current display mode normal or expanded whichever was in effect before Compare was turned on VFS When Compare has been turned on selecting VFS will let you position the compare spectrum vertically within the spectral display as described in Move the Compare Spectrum on page 58 It also allows independent VFS control of the compare spec trum ROls The choices offered by the ROI menu are Add or Delete an ROL Clear All ROIs and Load or Store ROI file Add ROls Select Add ROIs or press the keyboard s INS key to enter an ROI between the current marker positions The ROI will be of the current ROI type as defined in the Prefer ences dialog page 60 Auto ROI Select Auto ROI or press the keyboard s CTRL INS key to add an ROI at the current cursor position The ROI s width will be determined by the current energy and shape calibration The left channel will be 2 FWHM and 1 Low Tail to the left of the cursor The right channel will be 2 FWHM to the right of the cursor The ROI will be of the current ROI type defined in the Preference s dialog Delete ROIs Select Delete ROIs or press the keyboard s DEL key to delete
11. or both The Info button displays a dialog box which shows descriptive informa tion for the currently selected file if any is available More The More button lets you define or customize a dialog which allows editing of addi tional sample information parameters The content format of this dialog screen is de fined via a FDS file named AAAINFO FDS this must be in the directory defined by the environment variable EXEFILES Only CAM sample class parameters are sup ported by this mechanism If the required FDS file is not present in the required di rectory the More button will not be shown on the Edit Sample Information dialog screen Note Ifan FDS file is defined that contains sample parameters already present on the main edit sample information dialog any value entries for those du plicate parameters will be overridden by values entered in the main dialog screen Analysis Sequence The Analysis Sequence command allows you to create or edit analysis sequences that you can use to automatically analyze your spectra Figure 69 99 100 Alpha Acquisition and Analysis The Editor s window defaults to a minimum size but can easily be dragged to a larger size yw Edit Analysis Sequence E Step Selection r Edit Steps Current Steps Peak Locate Insert Step Peak rea Area Correction Efficiency Correction Nuclide Identification GainE valuator ParentD aughterCorrection Detection Limits Post NID Processing
12. putational presets Sample Info The Sample Info status page includes sample related information Title ID sample type quantity and units sample geometry geometry id and buildup type Calibration Info The Calibration Info status page includes energy and shape calibration information energy equation FWHM equation low tail equation and efficiency error at cursor po sition Display Info The Display Info status page includes data related to the current display window and the current ROI defined by the markers the display window s start and end channels and their energies and the display VFS The current ROI s width net cps and total cps are also shown If Expand is on the display window data is for the expanded window If Compare is on and the compare spectrum is currently selected the data is for the compare spec trum Input Info The Input Info status page includes data related to the configuration of the currently open input number of channels acquisition mode and the type of MCA Amp ADC and HVPS User Info The User Info status page includes six extra CAM parameters which can be used for special purposes CAM_T_DISSTR1 through CAM_T_DISSTRO If none of these CAM parameters have been defined this screen will be blank Nuclide Info The Nuclide Info status page includes estimated nuclide information for the current cursor channel Nuclide Energy Half life and Percent Yield If the cursor is within an
13. s a ic sl da RO OB eee ee ee ee Ee 111 Datasource Menus soos see iw ge ak a A a Gwe Gow ROG wo ae ad ew OG w Gs 112 Next GTOUD ane ee eke le wade Gok ee a ee ee ea em a og wed ew 112 Previous GLOUp y ia Gk oe ees aoe Be ea ee a ae E ee ee 112 Show All DatasQurces s er ecs eredt ertam epea ua Ee uD EE E EE 113 Workspace KllesS 20 00 ss eee 4G e RR a r ed a ON E 113 Example Alpha Spectroscopy Files a scs a c a acd ea a oo a a ee 115 MEX 00 eS ck we a a AA aaa a 117 Alpha Acquisition and Analysis This operations reference for Genie 2000 s Model S509 Alpha Option lists all of its commands and their functions by menu and submenu For a description of the application s user interface please refer to The Genie 2000 Tutorials Manual File Menu The File menu lets you open close or save a datasource save it under another name save as print or copy a plot of the current spectrum print the contents of the Report Window open save or delete workspace files and exit the program Open Datasource The Open Datasource command displays a dialog Figure 1 which allows you to open a datasource Look in gt CAMFILES y D 411000 cnt D Naidemo cnf A Test_spc cnf 2 Amblank cnf D Nbsstd cnf a Th1000 cnf D Bkgd1 cnf a Put000 cnf 2 Thblank cnf a Cal cnf a Publank cnf a U1000 cnf la Cernipf cnf la Test_bkg cnf la Ublank cnf Name CNF Source Detector File I Read Only Cancel Ty
14. 68 Interactive NID caos ahs ee a AA eels Bee ae ale 69 Analyze Menis e a aia BOE AS OR DR A a ae Ma dee MO ecw ee 70 Execute Sequence p eime pa ak RE EES ERE RRR EERE HEE REDE 70 Abort Seguen COs os a oe eat eel as nd oh ea ee eee pea ee eee pee 71 Analysis Phase Selection 2 4 44 6 ec sR ed ee eR eee eR AA 71 AGUIS vs au a a de Ay ine a E ks bt Sead a ne ee 72 Peak Locates e iio Gb ld Deed Hh Wide Bad a BI al ae lc wy 73 Unidentified Second Difference s ccce erreren erg ee Eia peu ERa 73 User Specified sos w s scis o ew ee A ew a ee aa 74 Library Locate Simple o o 75 P ak Aed eiee de e ease yas a ea RA 76 Sum Non Linear Least Squares Fit Peak Area 2 o o TI Area COMmeChON cce e d eee aue RE RE OER PRLS REP EER e Ow EE Hx 79 Alpha Background Subtract e 80 Standard Background Subtract o o o ee 81 Reagent Correction o eose so repa de HERE HERE OH OD OR ER eS 82 Efficiency Correction ds A088 eg MM ae we ee ee ee A 83 Nuclide Identifications usaras a A oe eee ae eae 85 Tentative NID s e sites ot ay td A eee ow oe AO ee oe wh he aA 85 Nr or eae ee ee eran ae eye os a ws eee ae e 86 NID with Interference Correction gt os esce o 0000020000000 00048 87 Detecuon mis pocitos Bet ears et HA Bhs Spee arenes Geeta eee 88 Post NID Processing sos a 4 fica aaa Bla de a A ed GT eh e ats 90 Action Level Calculations se oe ce ag 64 664886 8b Rew EES ERE RR OS 90 Control
15. Acquisition information 108 Analysis information 109 Delay ACQUISIUON sr a ee be n a e e 16 Standby s ea eoa toe eaaa 4 Hem oO 17 Deleting A sequence Step 101 AM ROM y o i ade Bane Se Ba ee 59 Detection limits Currie MDA and KTAMDA 88 Display Allplotchannels 97 Preferences cs bbe en eee ee ese 60 Selecting the scale 57 Display men o o 55 Display update rate 64 Drop peak function 29 118 E G Edit Sample information 98 Edit Colors 5 434 fae eee ee ae Care ws 61 Efficiency calibration 38 Auto function o o 39 Data sets total used 38 Efficiency correction 83 Energy Calibrate cursor method 30 Calibrate marker method 30 Coefficients calibration 22 Drop peak function 29 Energy only calibration 21 Full calibration 22 29 Order of the polynomial 29 Recalculate succi n sae a de 31 Recalibration auto function 32 Tolerance units s sace gi Mag ai i ai o 19 Units selection 19 Energy units Preferences Y ir 63 Error multiplier in analysis reporting 94 Example alpha spec files 115 Execute analysis sequence 70 Expand Command s s eck a ai 55 Offcommand 5
16. Buildup Type None Deposition Irradiation Random Begin Date at Error Sample Date 9 1 1978 at 6 00 00 AM pete OK Cancel Help Load Cal Cancel Hee tomcat Figure 68 Editing Sample Information 98 Edit Menu The Text Fields The text fields allow you to enter descriptive data for your sample You can enter up to 64 characters in the Sample Title field and all four of the Sample Description fields You can enter up to 16 characters in the Sample ID Type and Sample Geometry fields and up to 24 characters in the Collector Name field This dialog also asks for the sample Quantity its Uncertainty and its Units and the user defined percent Random Error and percent Systematic Error all of which are used in calculating the uncertainty for the nuclide line activity as described in the Basic Calculations section of the Algorithms chapter in the Genie 2000 Customiz ation Tools Manual Buildup Type Selecting None will allow entry of the Sample Date and time that is the time you col lected the sample The Begin Date is not available for this Type Selecting Deposition or Irradiation lets you enter the Begin Date and time and End Date and time for your sample s deposition or irradiation time Load Cal The Load Cal button lets you load a calibration file CAL into the datasource You have the option of loading the source s Energy Shape calibration Efficiency calibra tion
17. CNF CAM file or type in any detector name prefixing it with DET For example C genie2k camfiles Nbsstd cnf or DET DET1 or MHOTLABIWDET Ge2 Note that since the vertical scale should be automatically determined for printed com parisons Auto must be selected in the VFS Max Counts box 96 Analyze Menu Full Channel Display The normal method of spectrum plotting compresses adjacent channels to simplify the graph Check the Full channel display box to display every channel in the range of channels being plotted This option is only effective for a range of more than 1024 channels Save Datasource This phase specifies the save location for an open datasource If the phase is invoked from the Analyze menu the save will occur immediately after you click the Execute button Note Although analysis sequences can be executed in a command line environ ment using REXX or ANALYZE EXE directly the Save Datasource step will only work in that environment if automatic file naming has been en abled in the Sequence Preferences dialog on page 103 In an Analysis Sequence File the phase can appear more than once as a step The Save Datasource window in Figure 67 will appear once for each step when the sequence begins execution This lets you specify the save parameters separately for each in stance of the step The save parameters you specify for each instance will be used when that instance is executed in th
18. Efficiency Calibration on page 38 for an illustration and explanation of this screen By Entry Choosing to calibrate By Entry displays a dialog box Figure 30 which lets you man ually enter energy efficiency and percent error values to be used in generating the ef ficiency calibration Note that you can use up to 45 calibration data sets for calibration any more than that will be ignored Calibration by Entry Energy keV Channel FWHM Low Tail Energy Delete Channel Change PWHM Clear Low Tail IV Append to Existing Calibration Figure 30 Calibrate by Entry Add Button To create any entry in the list box type an energy value in the Energy text box then the corresponding Efficiency and Percent Error values in their text boxes When the values have been entered select Add You can add these energy channel pairs in any order they will always be displayed in ascending energy order Delete Button To remove a line and all its values from the list box highlight the line then select the Delete button Change Button To change any of the values for a line highlight the line edit any of the values then select the Change button to move the changes to the list box 37 Alpha Acquisition and Analysis Clear Button Instead of editing the values one by one you can remove all values from the text boxes for the highlighted line by selecting the Clear button This will clear all entries at the
19. Energy or variable FWHM which defines how large a difference can be allowed between a tracer peak and a peak in the current datasource and still be consid ered the same peak This information is not required if you chose Simple Efficiency Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase Analyze Menu Nuclide Identification The nuclide identification step contains the algorithms to perform the nuclide identifi cation and activity calculations Note that the MDA Confidence Factor is used both here and in the Detection Limits step page 88 If the Confidence Factor is changed here the Detection Limits calcula tions are affected too unless the factor is changed again before performing the MDA calculation Tentative NID The Tentative Nuclide Identification NID algorithm Figure 58 will generate a ten tative nuclide identification The algorithm looks at each of the peaks established by the Peak Area step of the analysis and attempts to find a match in the specified nu clide library It uses the specified tolerance to perform the search all nuclides that sat isfy that tolerance are recorded for reporting The nearest match will be reported first followed by any more distant matches
20. In addition the ADC must allow computer controlled adjustments and its zero adjustment must have been specified during setup Otherwise only the gain will be ad justed Calibrate Ideally the certificate file should list only those energies that correspond to all of the found peaks However the number of input true energies must be no more than twice the number of found energies and contain energies that actually correspond to most of the found peaks If the number of input true energies is more than twice the number of found peak ener gies peak matching and gain adjustment will fail The routine can t resolve more than one nuclide at the same energy in the source of true energies so matches will not be made at any true energy that is repeated Best re sults will be obtained if all of the input true energies have a relative separation of at least several FWHM It is also desirable to have peaks that span the full range of the spectrum Peak Search ASF Selects the Analysis Sequence ASF file to be used for the gain adjustment calcula tions For successful execution of AGA the selected sequence must include at least a peak locate step and a peak area step such as Peak_sho asf installed with Genie 2000 Ensure that the peak search parameters are optimized to locate those peaks that corre spond to the true energies in the specified certificate file while locating as few extrane ous peaks as possible If the specified ASF incl
21. RECOVELy a a ea acct ee eye 8 ere ee Gee eat poe ad a jes 92 Gain Fvaliator s vaca fa edad hee Pes eS eS eo Eee ee Oe 92 Reporting eate a Bete Gn Pare See AG ee i tee 94 Standard csi ok A Se de eA eB we a ee 94 Print Spect es s ce eee eR ER ER EE A RE aE 95 A sre ts ete Eye eee A Gayo Beeps ee 97 EditiM entl lt ada See es we a ed a Se O ek a Se ee 98 Sample ING vac s s aie oe ek ee ee hw Hoke a Bet ae hoe ae aoe a e aa a 98 Analysis Sequence gs 6c ei eee Fk we ow be a SE ee A A 99 Insert SteD es ee be eee veh ee SRE Re OEE HEE OE OEE REE Se eS 101 Delete Step s s ahah aie at ee a Et es AA a 101 Select Algorithm a 4 aS deen a a a mw aa G 101 Setup Algorithm s 4 466562 84 ee ERE RA 102 Sequence Preferences i keke Gh So Bh eee a ee aE OE he 102 Loidi aa Oe diets a ee PERS ARA AA Bale Begs 104 MOE avn Ge aes Gh wee ee es OO ab EE eee Ge eas ac 104 IPXOCULC ws M5468 hee end es Wee we A Beek ete TS eee oA eee ed E A 105 Options MEDU e424 ee bee ER ER HERE ARA OE ES 105 Change Operator Name 105 Interactive NID 4 24d vis ae be wade AAA 105 SUID ses eee RE he AE SR ES a Ce SOLE Se CREO eS eS RE ee ee ee x 106 SMO 66 5 e bE foe eee ale See ede BS ek a dee a 107 Datasourc e OVervieW s lt coore bbe RR RHE RR Re REE R EES 108 Acquisition Data a Sss a o sae wh e ee a ee a 108 Analysis Data 6 oa fe 3 OR ba Oo es DASA ede a AA e 109 Calibration Data e e sas See OS RR EA RR eR Re OE OE Se Ces 110 Report WindOW
22. ROIs you enter from now on will be known as type 3 You may use any combination of the four types and colors for ROIs which you add to the spectrum Note that the Peak Area Analysis algorithm sets regions around the peaks when it is run If you selected Show ROIs in MCA View in the algorithm s dialog box these ROIs will replace the currently displayed ROIs The type and color of each of these ROIs depends on the Peak Area Analysis algorithm used Peak Area on page 76 dis cusses the Peak Area routines and describes how they use ROI colors Peak Labeling You can add two kinds of peak information to the spectral display e Nuclide 1D labels which appear on ROIs identified by the Nuclide Identification Source page 63 e The Peak Information bubble which appear when the peak cursor is in an ROL The color of the Nuclide ID labels text can be changed but the color of the Peak Information bubble s text cannot 61 Alpha Acquisition and Analysis Display Nuclide ID on Spectrum Check the Display Nuclide ID on Spectrum checkbox to add a Nuclide ID label above every identified peak Multiple labels will be attached to a peak if more than one nu clide can be associated with that peak Note When data acquisition is active the label will appear only at the peak cur sor Figure 43 shows Nuclide ID labels on the peaks and Peak Information data for the sec ond Co peak in the NBS Standard spectrum Ascending C
23. Select I Perform MDA Test F Inhibit Acquisition Time Decay Correction f NID Confidence Tolerance 1 00 key patra 0 30 Energy C FWHM MDA Confidence factor 5 00 I Generate Report Cancel Help Execute Figure 59 The NID Setup NID Range The identification is limited to the specified NID Range only peaks within those lim its will be considered for identification Note that though the stop channel initially de faults to a large value the algorithm will only search to the spectrum s highest channel NID Library Type in the fully specified name of a library NLB file to be used in the identification or click on Select then choose a file from the file open dialog box 86 Analyze Menu Perform MDA Test The Perform MDA Test is not normally used with Alpha spectra In Alpha spectros copy it is most useful in cases where a nuclide has many peaks with small branching ratios that would result in peaks that are below the MDA level such as in most low ac tivity samples Enabling this function will ignore small peaks when calculating the identification confidence so that expected peaks below the MDA will not penalize the confidence test results Inhibit Acquisition Time Decay Correction If this option is enabled decay correction will not be performed during the count time Decay correction will still be performed for wait time the time between sample time and the start of the coun
24. Select Data to remove all spectral data including the time information in channels one and two from the display Select Data amp ROIs to remove both the data and all ROIs from the display Adjust Adjust allows you to adjust the controls of the current hardware datasource s pro grammable front end electronics This section shows typical adjust screens but only those which are applicable to the current datasource will be available to you and the controls they show will not necessarily be those shown in the illustrations As adjustments are made in the dialog box the new values are sent to the hardware To save the adjustments to the datasource s CAM file use the File Save command so that the next time this datasource is selected the proper setting will be loaded into the MCA The Next and Previous buttons at the left side of the dialog box are used to move to the next or previous page of the controls when there are more control elements than will fit in the basic box Alpha Acquisition and Analysis ADC Click on the ADC button to see the dialog box in Figure 6 which shows a typical ADC adjust screen The controls you see on your adjust screen may vary depending on which ADC you assigned to this datasource LLD threshld LLD ULD 1024 3 44 1 18 100 00 E RT T A ee all 3 gt Hep 2048 0 0 6 0 0 0 100 0 0 0 110 0 Figure 6 Typical ADC Adjust Dia
25. Subtraction of Alpha Environmental Background section of the Algorithms chapter in the Genie 2000 Customization Tools Manual UN Setup for Alpha Bkg Subtract x Bka File Select PT 95 Critical level test FT Generate Report Cancel Help Execute Figure 54 The Alpha Background Subtract Setup Background File Type in the fully specified name of a Background File to be used in the subtraction or click on Select then choose a file from the file open dialog box 95 Critical Level Test If the 95 Critical Level is enabled the net peak area of a peak after the background is subtracted must exceed the 95 Critical Level value as described in Critical Level Testing section of the Algorithms chapter in the Genie 2000 Customization Tools Manual Peaks that do not pass this test are discarded If the Critical Level test is not enabled all peaks are retained even if their areas are zero or negative after the background sub tract 80 Analyze Menu Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase Standard Background Subtract The Standard Background Subtract algorithm Figure 55 allows you to subtract back ground peak areas from matching peak areas i
26. The Analysis Sequences Analyze Menu Abort Sequence Selecting Abort Sequence allows you to abort execution of the current sequence Note that the sequence may not stop immediately it will continue until the analysis step already in progress has finished Analysis Phase Selection Choosing one of the analysis phases in Figure 48 lets you select an algorithm to asso ciated with that phase then assign and save the algorithm s parameters execute the al gorithm or do both U 232 Tracer Analysis Mo Tracer Alpha Analysis Am 243 Tracer Analysis wi IPF Pu 242 Tracer Analysis Th 228 Tracer Analysis Amc243 Tracer Analysis Figure 48 Phase Selection The following sections discuss each of the phases their algorithms and the required parameters For more detailed information on the algorithms refer to the Algorithms chapter in the Genie 2000 Customization Tools Manual gt The following sections discuss each of the phases their algorithms and the required parameters For more detailed information on the algorithms refer to the Algorithms chapter in the Genie 2000 Customization Tools Manual OK Selecting OK in the algorithm s setup screen saves the setup parameters you selected but does not execute the algorithm Execute Selecting Execute starts the algorithm using the defined parameters 71 Alpha Acquisition and Analysis Acquisition The Acquisition phase dialog box in Figure 49 allows you to define defaul
27. The routine completes successfully e The specified maximum number of iterations is reached e An acquisition is manually aborted 45 46 Alpha Acquisition and Analysis Setting Up AGA The Auto Gain Adjust Setup screen is used to select the parameters to be used by the routine Figure 35 Auto Gain Adjust Setup and Saye D2K_8164 Certificate File r Convergence a1 81642 CTF y Select G Singe Peak Search ASF C Double AGA_PK_ONLY ASF y Select Iteration Limit Preset Live Percent Gain Shift Time Tolerance 100 E V Adjust Zero DA Transfer IV Before J After BA File AGAexample v Select Cancel Save Help Figure 35 Auto Gain Adjust Dialog Certificate File Selects the Certificate File CTF to be used for the gain adjustment calculations The certificate file contains the energies and emission rates of the calibration source If the detector datasource is efficiency corrected by the specified Peak Search ASF the emission rate data will be used as an aid in properly matching true energies with found peaks Successful gain adjustment requires that the true energies listed in the specified certifi cate file correlate to at least half of the peaks found by the specified peak search ASF Successful ADC zero adjustment requires that at least one low energy less than 1 3 that of the highest certificate energy in the certificate file be matched with a found peak
28. U232 ctf sa Cal ctf rese IEEE Files of type far Certificate Files CT Cancel Help Info J Append to Existing Calibration m Figure 26 Calibrate by Certificate File Append to Existing Calibration When adding energy points to the current datasource from a file such as in construct ing a composite energy file there may be common energy points in the two files If the Append to Existing Calibration checkbox is selected the system will ask if you want to append to the existing calibration If you answer yes 1t will tell you each time it finds a duplicate entry Editing the List When the values for all nuclides have been entered select OK to move to the Effi ciency Calibration screen This screen allows you to examine and if necessary edit any of the lines Please refer to Efficiency Calibration on page 38 for an illustration and explanation of this screen 33 Alpha Acquisition and Analysis By Nuclide List Calibrating By Nuclide List lets you choose a nuclide list Figure 27 as a source of nuclide lines You can accept all nuclides in the list by choosing OK to move to the Efficiency Calibration screen which allows you to examine and if necessary edit the data in any of the lines Please refer to Efficiency Calibration on page 38 for an illustration and explanation of this screen E Calibrate by Nuclide List Library Stalib nib y Nuelides Save as Certificat
29. allows you to analyze the qual ity of the current datasource energy calibration and gain settings assesses the impact on NID analysis and make corrective data adjustments including file gain adjustments and saving the calculated energy calibration Gain Evaluator Setup Figure 64 asks you to specify the actual true energies ex pected to occur in the spectrum by selecting lines from the current NID results a cer tificate file or a nuclide library file These true energies are matched to peaks found in the resident peak search analysis results 92 Analyze Menu Gain Evaluator Engine Setup Source of True Energies Current NID Analysis Results C Certificate File z 1 1 1 C Nuclide Library z 1 1 I Generate Report Koi 764 49 Bl 214 Cancel Help Figure 64 Gain Evaluator Setup Output includes the reliability of the peak matching the percent gain shift and the re sulting energy shift in each found peak as a fraction of the local peak width The specified datasource must already contain a spectrum acquired from a source with known true energies Note Use generic nuclide libraries with caution since extraneous true energies can result in unreliable results and excessive calculation time Use of a source specific certificate file or nuclide library is recommended Generate Report Selecting the Generate Report button generates a report containing a table of data for all true and all found
30. and Analysis Simple Library Peak Locate Setup x Search Region Start channel fi Stop channel 4096 Nuclide Library CAGENIE2K4CAM FILESSSTDLIB NLB Select Tolerance 1 00 keV Energy C FWHM I Add to existing results TI Auto generate ROIs ROI Width 1 00 PwHM J Check for adjacent peaks I Generate Report Figure 52 The Simple Library Locate Setup Add to Existing Results and Tolerance If the Add to existing results box is checked peaks outside the specified Tolerance either fixed Energy or variable FWHM of a peak in the datasource s peak results ta ble will be added to the table Peaks within the Tolerance of an existing peak will not be added If the Add to existing results box is not checked the current peak results table will be replaced by this search Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase Auto Generate ROIs If this option is selected then the peak locate algorithm will automatically generate ROIs based on the FWHM calibration You can also specify a multiplier to be applied to the ROI width In addition an option for checking for adjacent peaks can be en abled this will flag any peak ROI that may be affecte
31. and explanation of this screen Energy Show Selecting the Energy Show menu item or the Show button on some screens will dis play the calculated energy calibration curve as a graph as seen in Figure 22 You can select the Energy button to show the energy curve or you can select the Shape button to show the FWHM and Low Tail curves Calibrate Energy Calibration Curves x Measured Calculated Ee C Shape EE Peak Drop PR 512 1024 1536 2048 2560 3072 3584 4096 Channel Datasource D ni eee w Energy 1 020e 001 keV PWHM 9 211e 001 ke a Bere rie E 22 Lo Tail 8 235e 001 keV 3 900e 004 Cancel Help Figure 22 A Typical Energy Show Display The Show Energy Calibration Curves display contains a Peak text box so that you can eliminate outlying peaks one at a time Enter the number of the peak to be dropped then select Drop Pk The peak will be deleted from the list and both the curve and the equation will be regenerated You may repeat Drop Peak until satisfactory results are obtained but you can t reduce the number of data points to less than two Note that the Order of the polynomial is limited by the number of data points pres ent For instance at least two points are required for a first order curve and at least four points are required for a third order curve The Order of the polynomial field is enabled for the energy curve only Click on the button to incr
32. another application such as a word processor or a presentation program Clear Contents Selecting this command will remove all data from the Report Window Load Existing Report This command loads a selected RPT file into the Report Window If there is already a report in the window the loaded file will overwrite it Execution of this command re quires that the Report Window not be minimized Default Size If you have changed the size of the Report Window either by dragging a window bor der or by using one of the sizing commands in this menu this command will return the window to its original size Maximize The Maximize command will enlarge the Report Window to full screen allowing you to read the data more easily Minimize This command removes the Report Window from the display and maximizes the spec tral display 111 Alpha Acquisition and Analysis Datasource Menu The Datasource menu doesn t appear in the Menu Bar until at least one datasource has been opened It can show up to eight datasource file names If more than eight datasources are currently open the More item will be added to the menu Selecting More brings up a list of all open datasources letting you choose the one of interest Fig ure 79 The maximum number of datasources which can be open at one time is 32 When one of the datasource file names is selected the spectral display area changes to show the selected datasource 1 nbsst
33. any adjusted hardware settings to the current detec tor s MID file Any adjustment already made will be retained only after saving Canceling or closing the dialog without saving will cause hardware settings to revert to their original values Cancel If the current parameters have not yet been Saved clicking the Cancel button will re set all parameters to their initial values and close the dialog 49 50 Alpha Acquisition and Analysis Auto Gain Adjust Status The Auto Gain Adjust Status window Figure 36 shows you a live time update of the gain adjustment while it s in progress Analysis results from each iteration acquisition are listed in order in the Data Text Box in the lower half of the window If you would like a record of the contents of the Data Text Box described on page 51 click the Print Report Now button Status Initiated Acquisition Iteration Matching is Sufficient Completed successfully Gain Shift 0 0 10 0 r Zero Gain 02 03 2004 2 23 57 PM Initial 64 600 Initial 0 000e 000 5 of 5 seconds Current 64 600 Curent 0 000e 000 1 2 Calculated 64 580 Calculated 4 183e 002 required matches 2 output matches Output is reliable Current Gain Recommended Gain Percent Gain Shift Tolerance Percent Gain Shift Datasource Energy Calibration E 2 13E 000 1 245E 001 Ch 0 000E 000 Ch 2 Calculated Energy Calibration E 1 71E 000 1 255E 001 Ch 0 000E 000 Ch 2 4
34. datasource in seconds minutes or hours Live time is mutually exclusive with real time but can be combined with any one computational preset Real time preset for the current hardware datasource in seconds minutes and hours Real time is mutually exclusive with live time but can be combined with any one computational preset External Start Stop These controls are enabled when a hardware datasource is opened that supports trig gering of collect via an external source When selected the chosen operation will be acted upon when the external source is triggered For example if external start is en abled and OK is selected collect will not start until the external collect trigger is re ceived Input Size The Input Size control lets you alter the input size in channels of the current detector input up to the maximum number of channels as defined in the MID file Computational Presets The Computational Presets are available only when the MCA is set to PHA mode or LFC mode None turns off computational presets only the time preset will be used Integral is a computational preset for the integral of any one ROI The integral value and the ROI s Start and Stop channels must be specified The ROI channels will de fault to the current computational preset if there is one otherwise the default ROI channels will be 1 to the highest channel number You may replace the default by en tering Start and Stop channel values or by using
35. e section name Within each section entries are formed of two parts separated by an equal sign The first part is the key name or entry name The second part is the string for the key value i e key name string key value The workspace file follows this format 113 Alpha Acquisition and Analysis Datasource This section contains key information about the datasource sections to follow the show all display option and the datasource that was being displayed OpenNames DSpn This key name value pair contains information about the names of the datasource sec tions to follow The value is a comma delimited list of strings used to uniquely iden tify the section names for datasource information Each string is made up of a DS string and a unique number i e OpenNames DS1 DS2 ShowAll 1 On 0 Off This key name value pair represents a on off switch for the Show All datasource dis play option A 1 represents a On value and a 0 is Off i e ShowAll 0 See Show All Datasources on page 113 for more detail CurrentDS datasource file name or Detector name The datasource name CurrentDS should contain the name of the datasource to be opened when the workspace file is loaded The name can be either a detector name or a fully qualified CAM file name i e CurrentDS c genie2k camfiles naidemo cnf DataSource DSx This section is used to specify information for a given datasource including the datasource name the
36. energies all matched energies and all found energies and a sum mary of the analysis results Source of True Energies Select the source of energies to be used in performing the Gain Evaluation All of the energies listed in the specified source will be used e The Current NID Analysis Results e A Certificate File e A Nuclide Library File Current NID Analysis Results Select the Current NID Analysis Results button to specify the Nuclide ID analysis results of the current spectrum as the source of true energies Certificate File Select the Certificate File button to specify a certificate CTF file as the source of true energies 93 Alpha Acquisition and Analysis Nuclide Library Select the Nuclide Library button to specify a nuclide NLB library as the source of true energies Reporting The reporting phase contains standard routines to output analysis results and other in formation contained in the datasource as well as a routine for printing spectra Standard The functions of the Standard reporting dialog are explained in the following para graphs The Genie 2000 Report System is covered in detail in the Report Module and Template Files chapter of the Genie 2000 Customization Tools Manual Template Name and Section Name To output the analysis results choose both a Template Name and a Section Name within that file as shown in Figure 65 note that a section named lt all gt is available if you want to use the
37. entire template file Error Multiplier Though uncertainty values are always calculated and stored at 1 sigma errors can be reported at a different sigma level by entering a specific Error Multiplier here For in stance if you d like errors to be reported at 3 sigma type in 3 as the Error Multiplier Start On You should check one of the boxes in the Start on section e Page One means that the first page of the next report section will be numbered as one e New page means that the new results will be appended to existing results and start on a new page e New file means that any previous report file spectrum file name with an extension of RPT will be overwritten if this box is not checked the data will be appended to the existing file 94 Analyze Menu Template Name Directory C GENIE2K CTLFILESS Section Name Header y Error multiplier 1 000000 Start on Output to J Page One T New Page IV Screen M New File J Printer Activity Units uCi Multiplier fi Cancel Help Figure 65 The Standard Report Setup Output To The report is always written to a disk file the default path is C GENIE2K REPFILES name RPT where name is the name of the datasource being reported on In addition the Output to box lets you also send the file to the Screen or to a Printer or to both Activity Units and Multiplier Activity Units is normally Ci if you want to use another unit for report
38. for those nuclides that were not identified and therefore had no activity values calcu lated If not selected the action level calculations will not include those nuclides for which no activity was found Use Upper Level Values When this checkbox is selected the activity plus its error or the MDA value plus its error will be used as the upper bound value for the action level calculation If not se lected action level calculations will simply use activity or MDA values Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name as sociated with this phase 91 Alpha Acquisition and Analysis Control Recovery The Control Recovery algorithm calculates the chemical recovery of a control sample Figure 63 w Setup for Control Recovery x Control Certificate File Select Control Volume mM OK Cancel i F Execute Figure 63 Control Recovery Setup Control Certificate File Select browse for or type in the fully specified pathname of the Control Certificate file Control Volume Enter the value in mL of the volume of the control added to the sample Gain Evaluator The Gain Evaluator can be used with both file datasources and detector datasources It does not perform any hardware adjustments Instead it
39. found by the peak locate method in use Peaks that are close to each other are au tomatically grouped into multiplet ROIs and analyzed as multiplets The method of de termining the ROIs is described in more detail in the Determination of Peak Region Limits section of the Algorithms chapter in the Genie 2000 Customization Tools Manual If the peak locate results already contain ROI definitions such as after a User Spec ified Peak Locate these ROIs will be used without changes No multiplet analysis will be performed If the peak locate results do not contain ROI definitions that is they in clude peak centroids only the ROI limits will be calculated automatically Peak Area Region You can limit the region to be searched by specifying the Start and Stop channels 77 Alpha Acquisition and Analysis Continuum This parameter is normally set to 0 for Alpha spectra When used the specified num ber of continuum channels or FWHM multiples are used on both sides of the peak to establish the continuum under the peak ROIs this value can also be specified within Calibrate Setup If you have two peaks that are close together reducing the number of continuum channels may give better results If you have poor peak statistics and there are no other peaks nearby increasing the number of continuum channels estab lishes the continuum more accurately but makes it more likely that close lying peaks will be considered as a multiplet inst
40. gain shift tolerance Gain Initial the amplifier gain before any adjustments are made not changed by AGA Current the gain which was used to acquire the data displayed in the report changes with each iteration Calculated the gain to be used on the next iteration changes with each iteration Zero Initial the ADC zero before any adjustments are made not changed by AGA Current the ADC zero value which was used to acquire the data displayed in the report changes with each iteration Calculated the ADC zero value to be used on the next iteration changes with each iteration Data Text Box The text box in the lower half of the AGA Status screen Figure 36 displays the con catenated data from all iterations as tabular data and gain adjustment data Tabular Data e True and Found energies in the first two columns with unmatched energies indicated by dashes e Matches are aligned showing the resulting gain Correction Factor in the third column 51 52 Alpha Acquisition and Analysis e The fourth column lists the ratio of the energy shift calculated from the evaluated energy calibration versus the current energy calibration to the local FWHM Gain Adjustment Data Input is considered sufficient if the number of supplied true lines is at least half the number of found peaks This makes it likely that the true pattern will be dominant reducing the chances of false matches Matching
41. in order wi Tentative NID Analysis Setup Ea Tolerance 1 00 keV NID Library Select PT Generate Report Cancel Help Execute Figure 58 The Tentative NID Setup NID Library This selection specifies the file whose nuclide library information is to be searched for each of the peaks You can use the Select button to browse for nuclide libraries Tolerance This is used to specify what value is to be used to decide if an energy line in the given library matches the peak being searched for The tolerance can be a fixed energy in keV or variable If you choose variable FWHM the tolerance becomes the number entered multiplied by FWHM calculated at the energy of the peak 85 Alpha Acquisition and Analysis Generate Report If checked a report will automatically be generated and displayed in the report win dow after the analysis has executed The name of the report template file and the name of section to be used are defined in the Analysis Engine File NID If the current spectrum already includes peak area and efficiency correction results the Nuclide Identification NID algorithm Figure 59 identifies the spectrum s nuclides as described in the Basic Calculations section of the Algorithms chapter in the Genie 2000 Customization Tools Manual UY Nuclide Identification NID Setup NID range Start channel fi Stop channel 4096 NID library le geniepc camfiles S TDLIB NLB
42. is considered sufficient when the number of peak line matches is considered statistically significant Statistical significance is determined when the number of successful matches compared to the number of possible matches true energies supplied exceeds that expected for a normal distribution within the determined number of standard deviations The determined number of standard deviations is provided by the listed Tolerance Factor The required threshold for statistical significance has a maximum of 0 75 to allow for up to 25 spurious input true energy lines Output is considered reliable when both the Input and Matching are sufficient Reliability must be established before Auto Gain Adjust performs any hardware adjustments in a given iteration Tolerance Factor is the minimum number of standard deviations of the energy uncertainties required to obtain the maximum number of unambiguous peak line matches The higher the tolerance factor the greater the number of standard deviations required for the matches the less stringent the matching process and the more likely that inappropriate matches might be made and therefore the more restrictive the criteria to consider Matching sufficient Average Shift FWHM Fraction gives the average from all of the listed energies and indicates the required NID Tolerance FWHM to be able to perform a successful NID analysis While this gives the average value for all of the found energies as a general characteri
43. of the found peaks and no more However to get reliable results and avoid excessive computational time the number of input true energies should be no greater than twice the number of found energies and contain energies that actually correspond to most of the found peaks The routine can t resolve more than one nuclide at the same energy in the source of true energies so matches will not be made at any true energy that is repeated Best re sults will be obtained if all of the input true energies have a relative separation of at least several FWHM It is also desirable to have peaks that span the full range of the spectrum Current NID Analysis Results Select the Current NID Analysis Results button to specify the Nuclide ID analysis of the current spectrum as the source of true energies Using the current NID analysis results as the source of true energies will be successful only if any gain shift was small enough to be accommodated by the NID energy toler ance during analysis Unexpected or low quality NID analysis results may indicate an excessive gain shift that would be better evaluated using a different source of true energies In this case selecting only expected nuclide energies from a nuclide library or certificate file is rec ommended perhaps requiring some trial and error experimentation Certificate File Select the Certificate File button to specify a certificate CTF file as the source of true energies Calibrate
44. once Append to Existing Calibration When adding energy points to the current datasource from a file such as in construct ing a composite efficiency file there may be common energy points in the two files If the Append to Existing Calibration checkbox is selected the system will ask if you want to append to the existing calibration If you answer yes it will tell you each time it finds a duplicate entry Editing the List When the values for all nuclides have been entered select OK to move to the Effi ciency Calibration screen This screen allows you to examine and if necessary edit any of the lines Please refer to Efficiency Calibration on page 38 for an illustration and explanation of this screen Efficiency Calibration Efficiency Calibration Figure 31 allows you to enter Energy values Efficiency val ues and appropriate Error estimates in order to calculate the average efficiency You can use up to 45 calibration data sets for calibration any more than that will be ignored UN Efficiency Calibration p Peak Edits Efficiency Enor 2 Energy kev Efficiency jo Delete Error o Cross over 88 00 00000 122 00 00000 279 00 00000 392 00 00000 662 00 00000 835 00 00000 898 00 00000 1115 00 00000 1173 20 00000 1332 60 00000 1836 00 00000 gt eo0000000000f T Perform Cascade Correction OK Cancel Show Help Use results Figure 31 Efficien
45. phases are described in detail under Analyze Menu starting on page 70 Sequence Preferences After you have begun editing an analysis sequence press the Sequence Preferences button to set a group of preferences for that sequence Figure 71 Analysis Sequence Preferences F Edit sample information Alierta P F Import calibration at execution T Prompt to select datasource Prompt C Specify now F Automatic file naming for Save Datasource steps Cascade Correction I Enable Cascade Correction Prompt for Geometry Use on Composer file Figure 71 Analysis Sequence Preferences Edit Sample Information If the Edit sample information box is checked you will be prompted to edit sample information when the sequence begins execution If the box is not checked there will be no prompt Note No prompt will be issued if the analysis sequence is executed in a command line environment using ANALYZE EXE directly or via REXX regardless of this preference setting 102 Edit Menu Prompt to Select Datasource If you check the Prompt to select datasource box you ll be prompted to choose a datasource when the sequence begins execution If the box is not checked the analysis sequence will use the detector or file datasource that is open and active when the analysis sequence is run Note No prompt will be issued if the analysis sequence is executed in a command line envir
46. spectra Auto Button The Auto button performs an automatic peak locate on the reference spectrum The list box is then populated with those energies found in both the populate file and the reference spectrum with their associated channel values Use Results Buttons The Use results button will retrieve energy channel FWHM tail results directly from the current data source and populate the list box This button will be disabled if peak area analysis results are not present Energy Recalibration Selecting Energy recal displays a dialog box Figure 24 which lets you recompute the energy vs channel calibration curve Shape calibrations FWHM and Low Tail are not affected by this command note that the FWHM energy and Low Tail energy pairs used by the shape calibration curves are zeroed out g Energy Calibration Recalibration x Energy key Channel Populate Auto Cancel Help Figure 24 The Energy Recal Dialog 31 Alpha Acquisition and Analysis Populate The Populate button invokes a dialog screen similar to the one in Figure 25 which allows you to populate the list box with the energies from the current datasource a certificate file or a previously stored calibration file 7 Calibration File O Certificate File Figure 25 The Populate Screen If the certificate or calibration population option is invoked when the list box already contains energies there may be a duplication of energy entries If a
47. step from the sequence highlight the step in the Current Steps list that you want to remove then click on the Delete Step button Select Algorithm To choose an algorithm for the current step press the Select Algorithm button For in stance if you had inserted and highlighted the Peak Locate phase step pressing the Select Algorithm button would bring up a window similar to Figure 70 which shows the Peak Locate phase s algorithms To associate one of the algorithms with the phase highlight the algorithm then press OK to save the association Bi Peak Locate ET Algorithms Unidentified 2nd Diff YMS Standard Peak Search User Specified Cancel Help Figure 70 Peak Locate Algorithms 101 Alpha Acquisition and Analysis Note that the Peak Locate and Peak Area algorithms Start Channel and Stop Channel parameters and all Report algorithm parameters can be specified differently each time one of those algorithms occurs in a sequence the Report algorithm s Standard step has an asterisk beside it to indicate this All other algorithms steps and parameters cannot be specified independently This means that each time one of those is used in a sequence a common set of parameters will be used Setup Algorithm After you have associated an algorithm with the phase press the Setup Algorithm button and verify or change the algorithm s parameters The setup screens and parame ter choices for each of the analysis
48. the List When you select OK you ll see the Efficiency Calibration screen which allows you to examine and if necessary edit the data in any of the lines Please refer to Effi ciency Calibration on page 38 for an illustration and explanation of this screen By Calibration File Choosing to calibrate By Calibration File displays a dialog box Figure 29 which lets you select a Calibration File defining the list of energy efficiency error triplets to be used for calibration The Info button displays descriptive information for the selected file Load Calibration File Look in ls naidemo cal a nbsstd cal sa test cal ferme Files of type Calibration Files CAL Cancel Help Info J Append to Existing Calibration Figure 29 Calibrate by Calibration File Append to Existing Calibration When adding energy points to the current datasource from a file such as in construct ing acomposite efficiency file there may be common energy points in the two files If the Append to Existing Calibration checkbox is selected the system will ask if you want to append to the existing calibration If you answer yes it will tell you each time it finds a duplicate entry Calibrate Editing the List When the values for all nuclides have been entered select OK to move to the Effi ciency Calibration screen This screen allows you to examine and if necessary edit any of the lines Please refer to
49. the MCA and elec tronic front end hardware Acquire Start Select Acquire start or press the F4 key to initiate data acquisition on the current datasource This command is disabled for datasources that are already acquiring data Acquire Stop Select Acquire stop or press the F4 key to issue an unconditional Stop command to a currently collecting datasource Acquire Setup Selecting Acquire setup displays a dialog box Figure 5 which allows you to define default acquisition parameters to be used when starting data collection on hardware datasources W Acquire Setup x m Mode m Time Preset 7 r External 9 Live Time 1000 F Start PHA LFC C Real Time Sec F Stop C LFC C Min MCS CHr MCS m Computational Preset Input Size None Value oS C Integral i Start Chan 1 18192 raros Y l C Counts Stop Chan 8 256 8192 ROI Selection Current Cancel Help Figure 5 Typical PHA Acquire Setup Alpha Acquisition and Analysis Mode The available acquisition modes depend on the MCA being used and the time and computational preset options depend on the current acquisition mode For instance time and computational presets are available only in PHA or LFC mode MCS presets not shown in Figure 5 are available only in MCS mode Time Presets The Time Presets are available only when the MCA is set to PHA mode or LFC mode Live time preset for the current hardware
50. the ROI between the markers The item is disabled if the markers are not positioned at the limits of a previ ously defined ROI Clear All Selecting the Clear All command clears all ROIs in the current database 59 60 Alpha Acquisition and Analysis Load Selecting Load displays a dialog box which lets you select a datasource whose ROIs are to be loaded into the current datasource These ROIs will replace the currently de fined ROIs if there are any Select the By Energy check box to load ROIs by en ergy This will attempt to use the energies stored in the ROI file rather than the channel values If the check box is not selected or those values are not defined then the ROIs will be loaded by channel value Note that only ROI files stored using Store ROIs will contain energy values Store Selecting Store displays a dialog which lets you select the name of a datasource which will be used to store the currently defined ROIs Note that ROI files created using Store ROIs will now store ROIs by energy and channel This allows you to load ROIs using the energy values if so desired Display Preferences Select Preferences to reconfigure the display with your own settings Figure 42 Display Preferences Plot Mode Update Information Normal ell Update Rate 0 secs C Reference Spectrum C Compare Spectra C ROL type 1 Peak Labels Green Blue Coe o ia gt C Full Enyelope C Fill
51. the calibration as shown in Figure 33 The measured vs calculated efficiencies are listed to show how accurately the curve follows the measured points g List Peaks Value Calculated Measured Pk Index keV Efficienc Efficienc 88 04 0 00480 0 00478 if O URS WS 3 165 85 0 00587 0 00578 4 279 19 0 00408 0 00409 Hse Figure 33 The List Peaks Dialog 40 Calibrate You can leave the list on screen while working in the Show Efficiency Calibration Curve dialog box so that you can easily change the graph s scale or drop peaks If you highlight a peak in the List Peaks box its peak number will automatically be placed in the Peak text box so that you can easily drop it Print Select the Print button to send an output of the currently displayed curve s to the de fault print queue Gain Evaluator The Gain Evaluator Figure 34 which can be used with both file datasources and de tector datasources does not perform any hardware adjustments Instead it allows you to analyze the quality of the current datasource energy calibration and gain settings to assess the impact on NID analysis and to make corrective data adjustments including file gain adjustments and saving the calculated energy calibration The specified datasource must already contain a spectrum acquired from a source with known true energies When the Evaluator window opens the evaluation results are populated using the datasource NID analysis results for
52. type of datasource and whether the datasource is to be opened as read only There should be a section like this for each name in the OpenNames section list DSName datasource file name or Detector name The datasource name DSName should contain the name of the datasource to be opened when the workspace file is loaded The name can be either a detector name or a fully qualified CAM file name i e DSName C GENIE2K CAMFILES Naidemo cnf DSCType 769 Detector 1 NativeSpect file Currently there are two types of datasources a detector or a file If the datasource is a detector then type value should be 769 If the datasource is a file then type value should be 1 DSReadOnly 1 On 0 Off This value is the flag to open that datasource as read only or not A 1 means On open as read only and 0 means Off open as read write Display This section contains the available Acquisition and Analysis datasource display options Each key name corresponds to a display option that affects how the datasource data is viewed All the key values except for CompareDS are On Off values 1 for On and 0 for Off Example Alpha Spectroscopy Files ScaleIsAuto 1 On 0 Off Set ScalelsAuto 1 to change the display s vertical full scale VFS automatically page 57 Set ScalelsAuto 0 to require that the VFS be set manually ScaleisLinear 1 On 0 Off Set ScaleIsLinear 1 to define the display s scale as Linear page 57 Set ScaleIsLi
53. will copy the current spectral display including expand window cursors markers to the Windows clipboard as a bitmap This image may then be pasted into other applications such as word processors and paint programs This com mand may also be invoked using the accelerator key CTRL C Alpha Acquisition and Analysis Data Plot The Data Plot command sends a plot of the data in the spectral display to the printer device The scale type linear or log and VFS are determined by the current settings of the spectral display Customizing Your Plot You can choose one of four plot styles any of three customization check boxes and ei ther a range of channels or the full spectrum Figure 3 Selecting any checkbox will preview that selection on the four sample plots Data Plot rvu ha ha ha ha Y Log Scal ly lu ES a noe E Channel C Chanel C Channel C Channel TX Energy Scale O m Range 4 Full Spectrum Start Channel fi End Channel 4096 Cancel Help Figure 3 The Data Plot Dialog Plot Styles Although any style will work well with any printer Styles 2 and 3 are intended for color printers and Styles 1 and 4 are intended for black and white printers 1 Solid black spectrum line ROIs filled with hatching 2 Solid black spectrum line with colored ROIs 3 Solid black spectrum line ROIs filled with colors 4 Solid black spectrum line Grid Check the Grid box to add X and Y grid lines to the pl
54. 2 56 39 PM Unidentified 2nd Diff Sum Non Linear LSQ Fit Efficiency Correction Standard Nuclide Identification NID ww Interf Corr Figure 77 Analysis Overview Analysis Sequence Description Analysis Sequence Description data names the analysis sequence file ASF used to analyze the spectrum If no sequence file was executed the Description will be blank Analysis Files Any additional files used to perform analysis steps such as NLB and CNF files will be listed here Note An entry in the Analysis Files section does not necessarily mean that the step has been performed on the datasource 109 Alpha Acquisition and Analysis Analysis Steps The Analysis Steps section lists the analysis steps performed on the datasource The list of steps is derived from an Analysis Sequence File ASF selections from the An alyze menu or both A grayed out algorithm name indicates that analysis step has not been executed Calibration Data The Calibration Data view Figure 78 displays the current energy and efficiency cali bration data for the foregound datasource Datasource Overview Acquisition Analysis r Energy Energy 1 020e 001 ke 4 567e 001 Ch FWHM 9 211e 001 keV 3 867e 002 E 1 2 Low Tail 8 235e 001 keV 3 900e 004 E r Efficiency Type Dual Order of Low Energy Poly 0 Order of the Polynomial 6 In Eff 3 390e 002 2 912e 002 In E 1 042e 002n E 2 1 9908 001 n E 3 2 14
55. 34 Partials zos 26 a 4 ora 24 34 Certificate save as 2 2 eee 24 34 Chemical recovery 92 Clear Data time automatically 73 HVPS latches e coi ra 15 Closing a datasource o o 3 Coarse gain amplifier 13 Coefficients energy i accs yoe ars ai 22 117 Compare Command r 4 3 84 9 ey eee eb ese 57 Moving the spectrum 58 Offcommand 59 VFS command 59 Compare another datasource 96 Computational preset 8 72 Continuum Peak area channels 78 Peak areafunction 78 Selecting the typeof 20 Control panel Expand off sus aoe ana a na aae a 56 Expand on button 56 Control panel mode 65 Control recovery algorithm 92 Conversion gain ADC 10 Counts preset ss ec carus te ee eee 9 73 Critical level test Alpha background subtraction 80 Areacorrection 81 Peak area oc ca oca morea made rauk 78 Reagent correction 83 Data plotting o da vas a ir PE a 4 Datasource Clos is os rs a 3 Comparingtwo 96 Men oi ab Ba eke ed Gg ws 112 OPE a c g bee ee ee ee ee eS 1 Sayit a sik dak She ae Seog w aara 3 Show alls c sacri cha h4 oa gad wo 113 TYPO OLS 4 oth kb Stee oe OE 2 Using more thanone 1 Datasource overview
56. 6 External start stop 00 0 8 File into ig ets e RS He a eS ARE aaa 3 Fine gain amplifier 13 Fit singlets peak area 78 Fixed parameters peak area 78 Full certificate file 24 34 Full channel plot display 97 Full energy calibration 22 29 Gain Centroid control 11 Mode stabilizer 0 12 Spacing stabilizer 12 Window stabilizer 12 Gainevaluator 04 41 analysis phase s s s o so ecco e ai a 92 Group A E ee 112 PHEVIOUS ass eco a ee 112 H N High voltage Automatic turn on o 15 Clear latches e isc ed e ae 15 HVPS output control 15 ICB latch reset eximir mis 15 Inspector reset se sssr o o 15 SUS o ia a s a 15 Voltage control 15 HVPS See High voltage Info button o ee ee ee 2 Integral preset s o 6 ssa bee eee ono 8 72 Interactive NID Option ori ee es 105 Labels Peaks co 4 SE Bo Gee da a 61 SPECWUM ss ra e 64 Library peak locate simple 75 Linear COnN ira ae 20 Vertical full scale 57 LLD control ADC 10 Load Calibration 2 4 64 48 be ek eee 99 Command s se ee a Re a e 18 ROIS og sei poe dc oe ee wk RS a 60 Log scale command 57 Low tail Curve values 4 27 Selection OT as eG Swe ae a
57. 9e 000n E 4 1 247e 001 n E 5 3 042e 003n E 6 p Peak to Total Order of Low Energy Poly 2 Order of the Polynomial 2 InfEff 1 861e 000 6 834e 001 InfE 7 6818 002n E 2 i InfEff 8 260e 001 1 120e 001 InfE 2 761e 002In E 2 Figure 78 Calibration Overview Energy The Energy data includes the energy FWHM and Low Tail equations Efficiency The Efficiency data includes the efficiency equation model type and the order of both the low energy peak and the polynomial Peak to Total The Peak to Total data includes the peak to total calibration equations the order of the low energy peak and order of the polynomial 110 Options Menu Report Window The Report Window menu item lets you choose among several commands three of these are for the window s contents the others control the window s size The window size you choose can be saved as a permanent setting see Preferences on page 60 You can create a PDF file of the Report Window s contents with the File Export Re port to PDF command page 5 Copy Highlighted Contents to Clipboard This command copies the highlighted contents of the Report Window to the system clipboard so you can paste the data in another application such as a word processor or a presentation program Copy Contents to Clipboard This command copies the entire contents of the Report Window to the system clip board so you can paste the data in
58. Calibration o ee 2 38 Show do A 39 Gain Evaluator di a e ia GE e ap 41 Source of True Energies a sorces ooo ose ss 42 The Data Plot ooo a a Se Doe da A don ae 43 Data Text BOX he oth ow oe a a e a A ee ee a 44 Fix Flle Gait ange t ecoa Ra HEHE ERR aa OE RE 44 pave New MAL Pile o oa aan ee aye Bet oe pe caw a4 eee oe vies E S 44 ReFyaluate 4 24 2444 022886 ug See dow oh de edhe hae AAA 44 Auto Gal AQUUSt sac E arte e ao A ae ee A ae a oe Re a a 45 Certificate Pile 3 200 Ace ed BA a A Ee ee er Ge a a 46 Peak Search ASF ps cme RR ERE ESE HEHE i prigen kee eig 47 Single Double Convergence merina vatia e a a a we ee se a i 47 Iteratiom Limit sasaa hee eS oie ee we Ae ahh ee Ase ae a Koala amp Ae Ged ia 47 Preset Liye Times s s mane eae det Seige ES oy de ds da Gh am oa ae 48 Percent Gain Shift Tolerance 2 o ee ee 48 Adjust ZOO foe ke OR OH REE RR ERE DER EO RES EE OE RE Ee ES 48 QA Transfer Before After co secr ouine a a a a a 48 E ROCUIE a e aie a a hg Gi Bose a aa on Bes ae 49 Saves fb weak PLS REO S RHE REEDED ED LG Ee we le A Reo 49 Cancel moto al oo ere Se oth spice tae es en xt ge ate eee Geiger de we ee ce bae 49 Auto Gain Adjust Status s soe m e 6 eae cae Re ee eR eee OR AAA 50 Cancel ADOL tol A he ee ag oR eee Bree SOAR be aie GOLEM Ole OR ee ee 50 Print Report NOW s ers u 3 2444 aaa PO Gee Be 8 we AS ee es 50 Return to Setup Save si r abe ed ee eRe Lew ERD HERD RR a 51 Gen
59. Efficiency Correction phase s Alpha algorithm calculates either the Simple aver age Efficiency from the calibration or the effective Tracer Efficiency from a tracer peak If average efficiency is available from the calibration and the tracer peak infor mation is provided the chemical recovery factor will be calculated as well Figure 57 shows that you can choose either Tracer Efficiency correction or Simple Ef ficiency correction 83 84 Alpha Acquisition and Analysis Y Setup for Alpha Efficiency Correction x Tracer Efficiency Simple Efficiency Tracer Certificate File Select Tracer Quantity 0 32 mL Pk Match Tolerance 1 00 FWHM C Energy FWHM Generate Report Cancel Help Execute Figure 57 The Efficiency Correction Setup Tracer Certificate File If you chose Tracer Efficiency this text box allows you to type in the fully specified name of a tracer certificate CTF file to be used for the tracer peak or click on Select then choose a certificate file from the file open dialog box This information is not re quired if you chose Simple Efficiency Tracer Quantity If you chose Tracer Efficiency this text box allows you to type in the amount of the tracer solution added to the sample in mL This information is not required if you chose Simple Efficiency Peak Match Tolerance If you chose Tracer Efficiency this text box allows you to type in a tolerance value either fixed
60. I Width Selecting this checkbox extends the MDA ROI to the left and right of the expected lo cation of the energy line by the number of expected FWHM s entered in the ROI Width text box If not selected 4 0 FWHM will be used for Curie MDA calculations or 1 25 FWHM for KTA MDA calculations 89 Alpha Acquisition and Analysis ROI Width This parameter establishes the width of the ROI as plus and minus the specified num ber of FWHMs from the expected location of an unidentified peak The minimum set ting is 0 8 FWHM Use Variable MDA Constants Selecting this checkbox allows the user to specify the values for the Add Constant and the Multiplier used in the MDA calculations as described in the Curie MDA section or the KTA MDA section of the Algorithms chapter in the Genie 2000 Customiz ation Tools Manual If the checkbox is not selected the normal equation of L k 2L is used At the typical 95 confidence level the normal equation is equivalent to specifying 2 71 for the Add Constant and 3 29 for the Multiplier Add Constant This parameter specifies the Add Constant used in the MDA calculation if the Use Variable MDA Constants option has been checked Multiplier This parameter specifies the Multiplier used in the MDA calculation if the Use Vari able MDA Constants option has been checked Generate Report If the Generate Report box is checked a predefined report will be genera
61. Inhibit latches are set After the fault condition has been cleared click on Clear Ov In Latches to reset the latches 15 16 Alpha Acquisition and Analysis Power Manager Click on the PwrMgr button to see the dialog box in Figure 11 which shows a typical power manager adjust screen The controls you see on your adjust screen may vary depending on which power manager you assigned to this datasource C HVPS Pwiign C Gain C Filter Next Standby delay 10min Prev Jl 0 250 Figure 11 Typical Power Manager Adjust Dialog Power Mode Click on a Power mode button to select one of the device s power modes The Battery Full mode keeps the system electronics on at all times using power from the device s batteries The Battery Save mode minimizes battery drain by turning off some of the device s circuits whenever possible When data acquisition is initiated the system changes to the Battery Full mode and data acquisition begins after the Acquisition Delay time has elapsed which allows time for the high voltage to reach its preset value and for the internal electronics to become thermally stable When acquisition is finished the system returns to the Battery Save mode In the AC Full mode the device operates from battery port A If the AC Power Adapter is connected to this port it will supply power to the device The AC Adapter s User s Manual tells you how to connect it to the battery port with the
62. Model 509 Genie 2000 Alpha Analysis Option User s Manual 9230875H V3 0 ISO 9001 SYSTEM CERTIFIED Copyright 2004 Canberra Industries Inc All rights reserved The material in this document including all information pictures graphics and text is the property of Canberra Industries Inc and is protected by U S copyright laws and international copyright conventions Canberra expressly grants the purchaser of this product the right to copy any material in this document for the purchaser s own use including as part of a submission to regulatory or legal authorities pursuant to the purchaser s legitimate business needs No material in this document may be copied by any third party or used for any commercial purpose or for any use other than that granted to the purchaser without the written permission of Canberra Industries Inc Canberra Industries 800 Research Parkway Meriden CT 06450 Tel 203 238 2351 FAX 203 235 1347 http www canberra com The information in this document describes the product as accurately as possible but is subject to change without notice Printed in the United States of America Genie is a trademark of Canberra Industries Inc Table of Contents Alpha Acquisition and Analysis 6 22 1 File Men e se as beable e wb oe A ee i a ek ee a Bk ww Ay ee ai 1 Open Datasource e gan cede ba eG AAA Ga es 1 CLOSE a ose RHE DEED EEE ORE A AA 3 DAVE sah eB wee we AMA e
63. NG NEGLIGENCE STRICT LIABILITY OR OTHERWISE REPAIR OR REPLACEMENT OF THE SOFTWARE OR EQUIPMENT DURING THE APPLICABLE WARRANTY PERIOD AT CANBERRA S COST OR IN THE CASE OF DEFECTIVE SERVICES REPERFORMANCE AT CANBERRA S COST IS YOUR SOLE AND EXCLUSIVE REMEDY UNDER THIS WARRANTY EXCLUSIONS Our warranty does not cover damage to equipment which has been altered or modified without our written permission or damage which has been caused by abuse misuse accident neglect or unusual physical or electrical stress as determined by our Service Personnel We are under no obligation to provide warranty service if adjustment or repair is required because of damage caused by other than ordinary use or if the equipment is serviced or repaired or if an attempt is made to service or repair the equipment by other than our Service Personnel without our prior approval Our warranty does not cover detector damage due to neutrons or heavy charged particles Failure of beryllium carbon composite or polymer windows or of windowless detectors caused by physical or chemical damage from the environment is not covered by warranty We are not responsible for damage sustained in transit You should examine shipments upon receipt for evidence of damage caused in transit If damage is found notify us and the carrier immediately Keep all packages materials and documents including the freight bill invoice and packing list Software License When purchasing our s
64. Reporting Save Datasourer Sequence Preferences Execute Figure 69 A Typical Edit Analysis Sequence Dialog In the Algorithms and Current Steps lists you ll see some steps with an asterisk before their names such as Reporting Standard These steps have parameters that con trol how the sequence s output will be presented Note An Analysis Sequence file can also be created or edited with the standalone Analysis Sequence Editor which is described in detail in the Using the Analysis Sequence Editor chapter in the Genie 2000 Operations Manual Unique Parameters Note that the steps listed in the following table have parameters that can be defined uniquely each time they occur in a sequence Step Parameters Peak Locate and Peak Area Start channel and Stop channel Save Datasource File name Save as type and Descrip tion Report All parameters other than Activity Units and Multiplier Edit Menu Common Parameters All other sequence step parameters are common they cannot be specified independ ently If there are multiple instances of one of these steps in a sequence all instances of that step will have the same parameters Insert Step To add a step to the sequence highlight a step in the Step Selection list box then click on the Insert Step button The step will be added to the Current Steps list Delete Step To remove a
65. a 20 Manual scale command 57 Marker info status page 67 MCA MOD ca Go a a PS T MCA only menus 65 MCS preset sss cea eee ay 9 73 MDA confidence factor 88 Modes power manager 16 Moving The compare spectrum 58 The rubber rectangle 56 Next SfoUp su co es 4 50 be eee ew es 112 Nuclide identification Interference correction method 87 MDA confidence factor 88 Standard method 86 Tentative method 85 Opening a datasource 1 Operatorname 105 Order of the polynomial 29 Overrange clearing 13 Partial certificate file 24 34 Peak area Region so a i ei des ba bebe ee os 77 Sum non linear LSQ method 71 Peak labels gue as a Bh Hee ae 61 Peak locate Simple library method 75 Unidentified second difference 73 User specified method 74 Phase Acquisition os e e o e 72 Areacorrection 79 Detection Limits 88 Efficiency correction 83 Gainevaluator 4 92 Nuclide identification 85 Peak area ss 8 vce ba oe Se eee ee 76 Peak locate vor a a GES 73 Post NID processing 90 Reporting e coe esca EY ae eS 94 Plotcommand 44664 6008 46 40 4 4 Plot to Clipboard o
66. a computational preset for the area of any one ROI The area Value and the ROIs Start and Stop Channels must be specified The area preset can t be used with any other computational presets but can be combined with either time preset Analyze Menu Counts is a computational preset for total counts in any one channel within the range specified by the Start Channel and Stop Channel The Value which must be specified indicates the number of counts which will stop acquisition The counts preset can t be used with any other computational preset but can be combined with either time preset MCS Preset Since MCS is not normally used with Alpha spectra Sweep Count should be set to 0 If MCS is used Sweep Count selects the number of sweeps to be made during multi channel scaling data acquisition Both Time and MCS Presets can be set here but which is used depends on the Mode Setup of the hardware input you acquire data from Clear Data Time Select Clear Data Time at Start of Acquisition to automatically clear both data and elapsed time at the start of acquisition Peak Locate The Peak Locate phase contains the algorithms which locate the peaks of interest in the spectrum Unidentified Second Difference The generalized second difference method Figure 50 locates all peaks in the Search Region that are significantly above the continuum as described in the Generalized Second Difference Method section of the Algorithm
67. accept all nuclides in the list by choosing OK to move to the Energy Calibration Full screen which allows you to examine and if necessary edit the data in any of the lines Please refer to Energy Calibration Full on page 29 for an illustration and explanation of this screen E Calibrate by Nuclide List Library Stalib nib y Nuelides Save as Certificate H IV Append to Existing Calibration OK Cancel Help Figure 18 Calibrate by Nuclide List Save as Certificate If you highlight one or more nuclides then choose Save as Certificate you ll create a partial certificate file CTP which can be used for energy calibration This certificate file is similar to the full certificate file CTF created in the Certifi cate File Editor lacking only the assay date and time and the activity units for each nuclide 24 Calibrate You can select OK to save this limited data as a partial certificate file If you want to add the missing information making this a full certificate file highlight one or more nuclides then choose Additional Info to bring up the screen shown in Figure 19 Additional Nuclide Information General Information Assay Date at Activity Units JuCi ne Conversion Factor Nuclide Uncertainty Name Activity In Activity m Nuclide Activity 0 000 Uncertainty 0 00 OK Cancel Help Figure 19 Editing Additional Nucl
68. ae BA a oo 60 Rubber rectangle Moving the 56 IRCSIZING s 3 oes cara 57 Sample changer advancing the 18 Sample info Buildup type 99 Editing v o ea btw e tea ee ds 98 Text fields osa Gea eg So a A 99 Save as certificate s ccce coe i e 24 34 Saving a dataSQUIC8 o 3 Scale Display isk wg Bh a A BSR ke eS 57 Ment sn a eee ee ae oe be ae eyo 57 Screen update Tate 64 Section name in analysis reports 94 Selecting an analysis algorithm 101 Setting The assay date 25 35 The high voltage 15 Up an analysis algorithm 102 Settings calibration 19 Shaping control amplifier 13 Show 120 All datasources 113 Efficiency calibration 39 Energy coefficients 22 Energy full ocioso Hee ee ao 28 Smooth FUNCHON sgn ee we ew ee 107 How it WOrKS o 108 Spectrum Copying i e cc a awe Be eS 3 Spectrum labels 64 Spectrum plottinga o 4 Stabilizer Adjustmentof 11 Gain ce tr id s e o ss esearo recut 11 Mode controlS o o cessas a waa 12 Overrange condition 13 Spacing controls 0 12 Window controls 12 LETO centroid cons Re 12 Standby delay o oo 17 Start Stop external o
69. analysis sequence file can point to the correct files background reagent blank nuclide identification library etc as and where they exist in your Genie 2000 installation You can gain additional insight into how the example Analysis Sequence Files work by taking the time to reanalyze one or more of the supplied field samples Index A Acquire Setup command 7 Startcommand 7 Stopcommand 7 Acquisition Delay control js 2 4 6 ns 2 a5 16 Parameters defining 7 Phase vas 62 6 eRe SESE HEA 72 Action level calculations 90 Activity units report 2 o o 95 Activity units choosing 35 ADC Adjustment of sce esmi saduras 10 Conversion gail 10 LEDa aa E 10 ULD 00 rena n E a HH 10 ZO A a ASEO A d 10 Adding an ROD oeii 6 eri a 59 Adjust ADELA inh otk o Es SES A 10 Amplifier o n 204 sh eee So ea he 13 Programmable controls 9 Stabilizer a ee g carr oR eR ES 11 Advance sample changer 18 Algorithm selection 71 Alpha background critical level 80 Alpha spec files example 115 Amplifier Adjustment sc se ees ae we ae 13 Coarse Palit iis ge a de 13 Fine gain moss ha eG a eee 13 Pole ZerO iros Ew Ga SS 14 PUR conttol os pora ia eRe eae a 14 Shaping control o 13 Super fine ga o 13 Analysis sequence Denne Ap soa 4
70. and Analysis Advance Selecting Advance issues an advance command to a sample changer assigned to the current hardware datasource If this datasource does not have a sample changer as signed to it in the MID configuration file the command will not be issued Load If you are displaying a Detector hardware datasource and you have at least one CAM File datasource open you can copy spectral data and optionally energy calibration information from the selected CAM File datasource to the Detector datasource Selecting Load displays the dialog box in Figure 13 Use the Load from list box to choose one of the open CAM File datasources If you want to copy the energy calibra tion information as well select the Include Energy Calibration check box Load x Load from nbsstd cnf ae Include Energy Calibration Cancel Help Figure 13 Load From a Datasource Calibrate The Calibrate menu provides several options for calibrating the energy and efficiency of the datasource graphically displaying the calibration setting preferences for the calibration and loading and storing calibration files 18 Calibrate Setup The Calibration Setup dialog Figure 14 allows you to select preferences and calibra tion settings to be used throughout the calibration and analysis processes Ea Calibration Setup Preferences Calibration Settings m Energy Units r Tolerance Energy Cal 1 500e 000 keV Eff Ma
71. ansfer data from the first iteration to the specified QA File Check the After box to transfer data from the successfully completed iteration to the specified QA File You may check either box or both boxes Specifying the Before box allows tracking the amount of pre correction gain shift with the first iteration Specifying the After box allows tracking any residual post correc tion gain shift with the successfully completed iteration Specifying both allows track ing of the amount of correction actually applied Calibrate QA File Enabled only if the Model S505 Quality Assurance Software is installed on your sys tem Use this field to Browse for the QA file to which the adjustment data is to be transferred This file determines which CAM parameters are extracted from the datasource for archiving For more information please refer to the Model S505 Quality Assurance Software User s Manual Execute When you click the Execute button you ll be told that executing this routine will overwrite your existing certificate file data with the data in the specified certificate file When you click OK the routine will start and the Auto Gain Adjust Status win dow page 49 will open Note The routine can usually determine which ampifier you re using If it can t you ll be asked to specify the amplifier type Save After executing the AGA routine click the Save button to save the current parameters both current setup parameters and
72. ays a dialog box which shows descriptive information for the currently selected file 54 Display Menu Store Selecting Store displays a dialog screen which prompts you to save the current cali bration into a CAL file Figure 39 This file can later be retrieved through Cali brate Load An Efficiency Geometry ID is required and must be entered You can enter an optional Calibration Description to be saved with the file asl Save in I CALFILES e ex En Save as type Calibration Files CAL Cancel Help Description Eff Geom ID temp Figure 39 Store Calibration Dialog Display Menu The Display menu contains several functions for the data display Expand Scale Compare ROIs and Preferences Expand The expanded display shown in Figure 40 is a split screen display with the whole spectrum in the lower half of the display and the expanded portion in the upper half The Expand window may be resized by placing the mouse over the splitter bar be tween the main spectrum window and the expand window Then click on the left mouse button and move the mouse while holding the button down 55 Alpha Acquisition and Analysis W Alpha Am1000 cnf File MCA Calibrate Display Analyze Edit Options Datasource Help o mi a lullujaj lolalala Acquire ROI Index Datasource Prey Next r TIME INFO Acq Start 7 22 94 11 29 00 AM Elapsed Preset Next Dead Ti
73. box Figure 16 If you edit an existing calibration curve any points previously used to generate that curve will be deleted and will not be available for further Populate operations on the current datasource y Energy Calibration Coefficients Ei meV faseren Th 0 TH2 fp th 3 FWHM oorteont kev aereo LoTal 9235001 keV 29008004 E Figure 16 The Energy Coefficients Dialog Show Button Select the Show button to display the energy calibration curve as a graph Please refer to Energy Show on page 28 for a complete discussion of this function Energy Full When you select Energy Full its cascade menu lets you choose how energies are to be entered for spectrum calibration e By Certificate File which allows you to select a certificate file containing the energies e By Nuclide List which allows you to select a list of nuclides and their energies from a specified library e By Calibration File which allows you to select a calibration file defining the list of energies e By Entry which lets you manually enter each energy its channel number and its FWHM and Low Tail values 22 Calibrate By Certificate File Calibrating By Certificate File lets you choose either of two types of a certificate file Figure 17 as a source of calibration energies full or partial The partial certificate file CTP is similar to the full certificate file CTF lacking only the assay date and time and
74. brary Lines the bubble s Activity values will be estimated Analysis Results Choose Analysis Results to display the Activity from the current NID results for this detector Energy Units Select the Energy Units to be used for reporting energy in the display Select Other to use the calibration units and conversion factor stored in the current datasource Plot Mode Normal shows a maximum of 1024 data points For example in a 4K spectrum the plot routine considers groups of four channels at a time and displays the channel in each group which has the highest number of counts Note that for spectra with more than 1024 channels selecting Full will slow down the display update rate e Full shows a data point for every channel in the spectrum being viewed e Envelope shows the normal plot with the data points connected 63 Alpha Acquisition and Analysis e Fill shows the envelope plot with a color fill of the data Update Information The Update Rate can be set for the number of seconds between screen updates of spectral data during data acquisition The range is 0 as quickly as possible to 60 sec onds with the actual rate affected by how busy the processor is at the end of any given update interval A value of 3 to 5 is usually best allowing an operator s key presses or mouse movements to be serviced promptly Real Time Expand Update If the Real Time Expand Update checkbox is selected the expand window will re fres
75. cy Calibration Calibrate Since Efficiency Calibration always executes the Peak Locate and Peak Area algo rithms you should first choose the algorithms you want to use from the Analyze Menu pages 73 and 76 If you don t specify your own choices Efficiency Calibration will use the first Peak Locate and Peak Area algorithms it finds in the spectroscopy appli cation s AEF file which may not always be the ones you want to use Note that the chosen peak algorithms are applied to all open datasources Accept Button The Accept button verifies the entered values and displays them in the list box The Delete Button The Delete button is used to delete the highlighted entry from the list box Auto Button If population has been done from a certificate file the Auto button will perform a peak locate with area analysis for each peak in the current datasource The list box is then populated with the peak areas in the datasource that match those in the certificate file Note that the peak locate and peak area analysis algorithms are determined by the analysis sequence selected from the Calibration Setup dialog page 19 If NONE was selected then the algorithms default to the ones last chosen from the Analyze Menu CAUTION Analysis sequence ASF files contain their own algorithm definitions It is up to the user to make sure that the algo rithms called in these sequences are the same as the algo rithms used for efficiency calibra
76. d cri 2 m 000 cnt 3 Amblank cnt 4 Bkodl cnf 5 Cal crif 6 Cerniph cat Pa 1000 crf 8 Test_bkog cnf Nestor Fi Eres lanai Shite Show All Datasources Figure 79 The Datasource Menu Next Group Select Next Group to index to and display the next memory group This menu item is available only if the datasource is a multi memory group input For example if you open a Detector Input called MULTI 1 4 the spectral displays will display the first memory group Selecting Next Group will display memory group 2 and the Title Bar will show MULTI 2 4 and so on Previous Group The Prev Group menu item which is available only if the datasource is a multi memory group input indexes to and displays the previous memory group 112 Workspace Files For example if you open a Detector Input called MULTI 1 4 the spectral displays will display the first memory group Selecting Prev Group will display memory group 4 and the Title Bar will show MULTI 4 4 and so on Show All Datasources Show All Datasources is available only if more than one datasource is open Selecting it will simultaneously display up to eight open datasources The name of each datasource will be shown in the top right corner of the datasource s display The ac quisition status of each hardware datasource will be shown in the top left corner You can list the next set of eight either by using F6 next datasource or by selecting the Datasource More menu
77. d by an adjacent peak Peak Area The peak area phase contains the algorithms to calculate the net peak areas of all peaks found by the peak locate phase independent of the peak locate method Analyze Menu Sum Non Linear Least Squares Fit Peak Area Selecting Sum Non Linear LSQ Fit brings up the setup screen shown in Figure 53 w Sum Non Linear LSQ Fit Setup Start channel fi T Use fixed FWHM Stop channel 4036 IV Use fixed tail parameter E Fit singlets Continuum fa Channels I Display ROIs Channels C FWHM J Reject zero area peaks Continuum function Step X Es Search E Area Region J 95 Critical level test J Perform Search Threshold 4 00 Minimum separation FWHM fico Max Num PwHMs for left limit Max Num FaHMs for right limit i T Generate Report Limits Determination Figure 53 The Sum Non Linear LSQ Fit Setup The Peak Area Non Linear Least Squares Fit algorithm calculates peak areas of multiplets using the fitting method described in the Peak Area for Multiplets section of the Algorithms chapter in the Genie 2000 Customization Tools Manual It normally calculates the peak areas of single peaks using a summation method de scribed in the Peak Area for Single Peaks section of the Algorithms chapter but you can choose the peak fitting method instead This method also automatically determines the region of interest ROI around each peak
78. dialog with an OK a Energy Calibration Energy Only Calibration Energy Peak Edits keV Channel Energy l keV Channel _ Delete Gian Approximate FHM OK _Cancel zrs He curve will be supplied Figure 15 Energy Only Calibration Manual Method To add an entry to the list box type an energy value into the Energy text box and the corresponding channel number in the Channel text box then select Accept You can add these energy channel pairs in any order they will always be displayed in ascend ing energy order Cursor Method To use this method there must be a spectrum in the Spectral Display area and its cur sor must be on the peak that is being used for calibration Select the Cursor button to add the window s cursor channel position to the Channel text box Now enter an energy value in the Energy text box and press Accept to add the data to the list box Show This function is available only when at least two energy channel pairs have been en tered either by you or by the system When you select the Show button the energy calibration curve will be displayed as a graph Please refer to Energy Show on page 28 for a complete discussion and an illustration of this function 21 Alpha Acquisition and Analysis Delete To remove a line and its values from the list box highlight the line then select the De lete button Energy Coefficients Selecting Energy Coefficients displays a dialog
79. duplicate is found you will be asked if you want to replace the existing energy entry Auto The Auto button performs an automatic peak locate on the reference spectrum The list box is then populated with those energies found in both the populate file and the reference spectrum with their associated channel values Show Button Select the Show button to display the energy calibration curve as a graph Please refer to Energy Show on page 28 for a complete discussion and an illustration of this function Efficiency When you select Efficiency its cascade menu lets you choose how energies are to be entered for spectrum calibration e By Certificate File which allows you to select a certificate file containing the energies e By Nuclide List which allows you to select a list of nuclides and their energies from a specified library 32 Calibrate e By Calibration File which allows you to select a calibration file defining the list of energies e By Entry which lets you manually enter each energy and its Efficiency and Error values By Certificate File Calibrating By Certificate File lets you choose a certificate file Figure 26 as a source of calibration energies and their efficiencies When you have highlighted the certificate file name you want to use you can either select Info to see more informa tion on the file or OK to load the file into the energy line editor Open Certificate File a Am243 ctf an
80. e H IV Append to Existing Calibration OK Cancel Help Figure 27 Calibrate by Nuclide List Save as Certificate If you highlight one or more nuclides then choose Save as Certificate you ll create a partial certificate file CTP which is similar to the full certificate file CTF created in the Certificate File Editor lacking only the assay date and time and the ac tivity units for each nuclide To save this as a full certificate file to use for efficiency calibration you ll have to add the missing information Highlight one or more nuclides then choose Additional Info to bring up the screen shown in Figure 28 Calibrate E Additional Nuclide Information General Information Assay Date at Activity Units JuCi RE Conversion Factor 37000 Nuclide Uncertainty Name Activity In Activity Nuclide Activity 0 000 Uncertainty 0 00 OK Cancel Help Figure 28 Editing Additional Nuclide Data Append to Existing Calibration When adding energy points to the current datasource from a file such as in construct ing a composite efficiency file there may be common energy points in the two files If the Append to Existing Calibration checkbox is selected the system will ask if you want to append to the existing calibration If you answer yes it will tell you each time it finds a duplicate entry Additional Nuclide Information In addition to entering the
81. e Type in the fully specified name of a background CNF file to be used in the subtrac tion or click on Select then choose a background file from the file open dialog box Tracer Certificate File Type in the fully specified name of a tracer certificate CTF file to be used for the energy of the tracer peak or click on Select then choose a certificate file from the file open dialog box Tolerance Enter a tolerance value either fixed Energy or variable FWHM to define how large a difference can be allowed between a peak in the current datasource and a peak in the background datasource and still be considered the same peak 95 Critical Level Test If the 95 Critical Level test is enabled the net peak area of a peak after the back ground is subtracted must exceed the 95 Critical Level value as described in Criti cal Level Testing section of the Algorithms chapter in the Genie 2000 Customization Tools Manual Peaks that do not pass this test are discarded If the Crit ical Level test is not enabled all peaks are retained even if their areas are zero or nega tive after the background subtract Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase Efficiency Correction The
82. e An asterisk next to the pa rameter means that the setting read from the device was different than expected Though the majority of the entries in the Status Report are direct reflections of the MCA Input Definition Editor settings or the spectral display Adjust settings a few of them are explained in greater detail in the Status Screen Entries section of the Tech nical Information appendix in the Genie 2000 Operations Manual The Update button sends all programmable parameters to the devices and verifies them updates the Status Screen and if the Status field had been changed to red be cause an error was detected on the datasource changes the field to white if the re ported error has been corrected remember that a datasource includes an MCA and various front end devices You ll find more information on possible errors in Genie 2000 Input Datasource Errors in the Genie Error Codes chapter of the Genie 2000 Customization Tools Manual w MCA Front End Hardware Status Type 12K Serial No 1111 MCA Hardware version v1 0 Type 12K DSt Serial No 0 Zero correct 1 Gain centroid 7680 ch Gain window 8 chs Gain spacing 64 chs Gain rate div 1 Correction mg Ge Gain mode Off Gain correct 0 Gain overrange Clear Gain ratio 1 000 2 Type 12K Hi Serial No 0 Voltage 1300 0 Inh signal Positive Polarity Positive Status On Update Help Figure 12 Typical Status Report 17 Alpha Acquisition
83. e NID Dialog 105 106 Alpha Acquisition and Analysis As you may move the cursor in the spectrum window Interactive NID will attempt to find the closest matching line within tolerance in the nuclide library and select that line in the list box Alternatively you may select a line in the list box and this will au tomatically move the spectrum cursor if possible to that energy The nuclide information for the currently selected line will also be displayed in the Nuclide Info status page If the cursor is within an ROI an activity will be calculated using the current efficiency calibration and displayed in that page Sort By Nuclide or Energy The list can be sorted either by nuclide name or by line energy Use these radio but tons to toggle between the two modes Show Confirming Lines If the Confirming Lines box is checked the energies of any other lines for the selected nuclide will be marked in the spectrum window Setup The Setup button lets you change the Interactive NID preferences This includes nu clide library tolerance and activity units Strip The Strip command Figure 74 lets you choose the Background Datasource which is multiplied by the constant entered in the text box then is subtracted from the Current Datasource channel by channel The Background Datasource is chosen by clicking on one of the Datasource Type buttons then selecting a CNF file using the Files list and Directories list in the cen
84. e question marks will be replaced with an integer e The original file will be retained in its native format e The converted file will be opened by the application The supported types are InterWinner CAM Oxford AccuSpec v 4 1 Unpacked ae Aptec PCMCA S100 File Ortec GammaVision Silena V 6 31 7 02 EasySpec Intertechnique Nucleus Ortec ADCAM Sampo 90 PC ToolKit Gamma AT IEC 1455 Spectran AT The Info Button Press the Info button Figure 1 to display information about the currently selected CAM File datasource File Menu Close Selecting Close lets you close the current datasource If the open datasource has been changed but not saved you will be asked if you want to save it Save Save allows you to save the datasource with all related information to its original lo cation Save as Save as displays a dialog box Figure 2 which prompts you for a file name to save the current datasource to The Description text field lets you add a file description of up to 32 characters to be saved with the file A 2x Save in SI CAMFILES lt a ex EJ i E BNbsstd Thblank Bpruiooo Burooo E Publank Bublank E Test_bkg Test_spc Th1000 Save as type CAM Files CNF Cancel Description Figure 2 The Save As Dialog This information which you l see in the File Descriptor field in the Open Datasource dialog box makes it easier to identify this specific data file Plot to Clipboard
85. e sequence Save in 1 CAMFILES ea eE i gt 0000001 CNF Ei Test_spe cnt Ei Test_bkg cnf E Nbsstd cnf Naidemo cnf y Cernipf cnf File name ooo Save as type cam Files CNF Cancel Help Description Figure 67 Save Datasource Dialog 97 Alpha Acquisition and Analysis Save as Type The Save as type box lets you select the file format you ll save as CAM CNF Toolkit TKA or IEC455 IEC If you type in the file name without an extension the selected Save as type extension will automatically be appended To save a file with an extension other than those associated with the file filters type the file name and extension surrounded by double quotes filename abc into the Save as type box Description For CAM files you can enter an optional description of up to 32 characters Edit Menu The Edit Menu allows you to enter and edit Sample Information define and edit Anal ysis Sequences Sample Info Sample info presents you with a dialog screen Figure 68 for entering sample infor mation for the current datasource This is the same dialog you ll see if you select the Edit Sample Info menu item in the spectral display application W Edit Sample Information Sample Title GENIE 2k Spectrum No 1 SampleID NBS Std Collector Name Type Point Source Sample NBS Standard Source Quantity Description Uncertainty Units m Sample Geometry
86. e zero to function properly the incoming counts should be between 25 and 100 of full scale For a 0 2 MeV setup this generally means that at 500 keV or higher the incoming count rate in this window should be greater than 100 cps The maximum count rate over the full ADC range should be lt 2 kcps If the pole zero fails to converge check for the proper count rate The pole zero adjustment will be more accurate if the spectrum contains a significant count rate above 70 of full scale After adjusting the pole zero you can see the current pole zero setting by selecting a different Adjust screen such as ADC then reselecting Amp This will update the number above the slider control If after performing an Auto P Z and refreshing the screen the setting has changed significantly try to do another Auto P Z cycle the P Z circuits may need more time to find the optimum setting Manual P Z In some situations the auto pole zero may fail to converge to an optimal value so a slider control is provided which allows you to manually adjust the pole zero setting The adjustment procedure is described in detail in the Manual Pole Zero section of Appendix D Technical Information in the Genie 2000 Operations Manual MCA Menu TRP Preamps When a Transistor Reset Preamp TRP is used the pole zero is fixed at 0 but you may have to make an adjustment on the TRP preamp so that the amplifier and ADC are gated off during the preamp s reset ti
87. ead of as a singlet Continuum Function None should always be selected when calculating the peak area of Alpha spectra The Linear and Step functions are available but are not normally used for Alpha spectra Linear is adequate when a spectrum s continuum is relatively flat It is a simple straightforward equation that estimates the continuum under the peaks as a trapezoid The Step function should be chosen if there are any regions in a spectrum where the continuum is significantly higher on the left side of a peak region than on the right side this function automatically reduces to a flat line if the continuum is flat 95 Critical Level Test If the 95 Critical Level test is enabled the net peak area of a singlet is examined to see if it exceeds the 95 Critical Level value as described in the Critical Level Testing section of the Algorithms chapter in the Genie 2000 Customization Tools Manual Peaks that do not pass this test will be deleted from the peak results table If the Criti cal Level test is not enabled all peak areas are accepted regardless of their size even negative areas Fixed Parameters Selecting the Fixed FWHM Parameter or Fixed Tail Parameter check box causes the chosen parameter s to be used for all multiplet peaks instead of allowing the value to vary for best fit If either or both of these check boxes is not checked the specified pa rameter will be allowed to vary Fit Singlets Normally
88. ease decrease the order value Select the Print button to send an output of the currently displayed curve s to the de fault print queue Energy Calibration Full The Energy Calibration Full dialog Figure 23 allows you to mark calibration peaks in a reference spectrum then calculate the energy vs channel FWHM vs en ergy and tail vs energy curves You can enter Calibration peaks into the list box by the Cursor Method or the Marker Method described in the following subsections 29 Alpha Acquisition and Analysis Wy Energy Calibration Full Energy r Peak Edits keV Channel l 88 04 OD Ey Db E A 165 85 K i Cursor Delete 279 19 y i i EE 391 69 A i A Ref Pk 514 00 Markers e Auto Use results Figure 23 The Energy Calibration Full Dialog Peak Edits In the Peak Edits box you ll see the Cursor button which is used with the Cursor Method the Markers button which is used with the Marker Method and for both methods the Accept button used to add the entry in the Energy text box to the list box and the Delete button used to delete the highlighted entry from the list box You ll also see the Ref Pk button which selects deselects the currently highlighted entry in the list box as the reference peak Only one peak from a pulser for instance may be assigned as a reference peak The reference peak will not be used during the calculation of the calibration coefficients Cur
89. ee ete ee a ete pw dea sO Bad ey 6 3 SIVE AS A aut Bowe ao e ee ee Se A GS A ae ade A 3 Data Plot s s hos cet ee ti a wa a eR fe a ke dy a ow wk S 4 PADU eink oe fsa ea gue oe wee ea eee Ge ce pee oe ge ee or Goat we era 5 Plot to Clipboard lt eorne ee hee eR ROH EE Le ee ew ee 5 Print Report Window s as ooh gous BS Se es SS eR Oe ee Ae 5 Export Report to PDP z asos ame ss G4 a gre ae a Bae eG a Bow ew a es 5 Open Workspace 24 2 644846 Gb 8 BS Howe RRL REE E REE HEED ERE RES 5 WAVE WOLKSP ACG vip yet icc ak Tove at eyes a rie ee area cash et Ae 6 Delete Workspace i a ge 2 Gee donb Rh ede wed pra y he a eS a E a 6 EKIN oy sauce kt deen ca ke he abies oD Ae ene che ig A ee anc Gt ee at aR BP iam ee SG oD eile oh i 6 MCA Mnt i ece 24 62d ORG oe A we ae ee HOB ele ee 7 Acquire Stat ss da4 848 sde a a o EPE e EN 7 ACQUITE SLOP s e sosca kh ee me we a hh A ek a hw a a ee 7 Acquire Setup so cox bb deed obo ee Dasa eb ER Rae ee See ean ee OSS 7 Mod sore e a bi MG a Oe ae ey a Oe ewe A 8 Tim Presets e ssor iici o Gee BS Seeds e foe A A Se 8 External Start Stop eoe mcs cee be ERED EA RG HEH SEE OE Oe a eS 8 INPUESIZE 4 6 4 5 a ate ee Awe Sw ew a ee aa 8 Computational Presets ca a ee ee 8 MCS Preset ceee i ae ede aS REED OT ORES Ee wh eR REM we Ss 9 Cleat vani a Meet sane e ape eh O ie ie eee Se era Bory ot 9 AUS as a ee So eR A OS Oe A eee eae A ew Se we 9 ADG se bt 6 Bae Ts eee eka ate al RS eh a tat get d
90. em changes between the energy calibration ac quisition and other acquisitions the energy calibration becomes inaccurate for the other acquisitions This suite of gain adjustment utilities provides the ability to assess the magnitude and importance of gain shifts for all datasources Gain Evaluator and to fix the gain shift for active detectors Auto Gain Adjust and saved files File Gain Adjust The routine collects a spectrum analyzes it for peaks compares the energy at which each peak is observed against the true energy in a certificate file then derives the ac tual energy calibration equation Differences between actual and desired energy cali brations drive the hardware adjustments The AGA Routine 1 Acquires a spectrum for the specified preset live time 2 Performs a peak search using the specified ASF algorithm 3 Matches the found peak energies to the energies in the specified certificate A weighted average gain correction factor and possibly a zero correction is calculated e Ifthe average gain correction factor satisfies the specified Percent Gain Shift Tolerance adjustment is complete specifying double convergence requires this to occur twice successively e Ifthe average gain correction factor does not satisfy the specified Percent Gain Shift Tolerance the gain and possibly the zero is adjusted appro priately 4 Clears the spectrum 5 These steps are repeated until one of the following occurs e
91. eral Information 51 Data Text Box sxe bob aie ods we ARA AR See OE OES AA 51 File Gain Adjust 2 dae OR eee a cara e we REY Re a E e a 53 Current Energy Calibrations sds eose ee ee 53 Goal Calibration File sos ee temea wne piepe ee Eok 53 Goal Energy Calibration ee ss ea o an a a eaa ee 54 Reanalyze After Adjustment s e sawe amacaa denomina aea eah 54 Load eee hae a A Db ee we a Oe Oe be Bae Oe a a 54 LOTES 3 Ay Bath e Meat ae e Me Rl dae Sed We Swe RR Boece Ai a hee Bs 55 Display Menu oc i x a8 of Se ead ale ow a A A HS a AR 55 Expand hi dene Be eee ET melee ge he eB e lea e ay aoa hs 55 CAG a gy eta se ce Grn ee er geno oS Ga ce er We pce a gee og Se eee ae a E D7 Compare s eoe soe a ew ER AA 57 ON ote Rice we he A Gea Bt we a ee ke ae 58 O coi ak a e ye A RE ew oe A oe a Ae Qe de ble 59 VES eea ea nampa eae paepe Re REE ESE ERE OE ERED ER ED 59 ROIS eek a ed ee eight Yee Bs ate aca 59 Display Preferences sos o a dei eae aaa 60 Fit C OlOTS 4 a a es a ses SU e ae Gee ay Ee flees ee 61 Peak Labeling 2 ope boa a Be Oh ES A Bee a Ales 61 Energy Units 3 eree bed eed RA ee ERE RRR LEHRER RR EE HS Ee HS 63 PIOU Mode e ma a ss er aa et e as odo er eee ey Re es er Ba dd ate ee 63 Update Information s a 22 2408 sb a a A Sw ee we aa 64 Spectrum Labels s s s s sus sce de awe a a ae ke we ee 64 IVICA VAC Woe dos sh es teste os oe eee oe E es or os et ee ete 64 OperatiONS eie ke eee DRE CR ORDER EOE LEH EE GOS ee ES
92. ergy Calibration This box displays the energy calibration equation of the current datasource Goal Calibration File Browse for the CNF file or CAL file containing the calibration equation which you want to match the current data source s equation to 53 Alpha Acquisition and Analysis Goal Energy Calibration When the Goal Calibration File has been specified this box will display the file s en ergy calibration equation Reanalyze After Adjustment Check this box to reanalyze the current datasource using the specified ASF file after the adjustment has changed the spectrum Reanalysis is recommended because the cur rent analysis results may not be accurate for the altered spectrum ASF Specify the ASF file you want to use for the Reanalyze After Adjustment selection Load Selecting Load displays a dialog screen Figure 38 which permits you to select a cali bration file CAL to be loaded into the datasource being operated on You can choose to load the source s Energy Shape data Efficiency data or both Load Calibration ple zjx Look in y CALFILES Y e e em fal 99 11 COI corrected BE2820 2 CAL fal Tennelec Plastic Disc PT set CAL fal 99 11 COI corrected BE2820 CAL falo9 11 COI corrected CAL FalessTD CAL yl File name Files of type Calibration Files CAL z Cacal Help J Energy Shape IV Efficiency J Peak to Total info Figure 38 Load Calibration Dialog The Info button displ
93. ftware provided by us in connection with equipment manufactured by us shall operate in accordance with applicable specifications when used with equipment manufactured by us and that the media on which the software is provided shall be free from defects We also warrant that A equipment manufactured by us shall be free from defects in materials and workmanship for a period of one 1 year from the date of shipment of such equipment and B services performed by us in connection with such equipment such as site supervision and installation services relating to the equipment shall be free from defects for a period of one 1 year from the date of performance of such services If defects in materials or workmanship are discovered within the applicable warranty period as set forth above we shall at our option and cost A in the case of defective software or equipment either repair or replace the software or equipment or B in the case of defective services reperform such services LIMITATIONS EXCEPT AS SET FORTH HEREIN NO OTHER WARRANTIES OR REMEDIES WHETHER STATUTORY WRITTEN ORAL EXPRESSED IMPLIED INCLUDING WITHOUT LIMITATION THE WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE SHALL APPLY IN NO EVENT SHALL CANBERRA HAVE ANY LIABILITY FOR ANY SPECIAL EXEMPLARY PUNITIVE INDIRECT OR CONSEQUENTIAL LOSSES OR DAMAGES OF ANY NATURE WHATSOEVER WHETHER AS A RESULT OF BREACH OF CONTRACT TORT LIABILITY INCLUDI
94. g the Status Page Shown checkbox lets you click the Status Pages button to choose which pages will be displayed Figure 45 Display Menu The Status Pages you choose can be saved as a permanent setting see Display Prefer ences Save on page 60 tf Status Pages Ea Marker infa MV Time Info IV Sample Info Tl Calibration Info Display Info nput Info ser Info uclide Info r F F IV u N Cancel Help Figure 45 Selecting the Status Pages Note that some of the data shown on the Status Pages is the result of a rough calcula tion for the region between the markers This means that this displayed data may not agree with the data you see in a report generated by your analysis application Marker Info The Marker Info status page includes data related to the current Region of Interest ROD left and right marker channel and energy centroid channel and energy area and percent error FWHM and FWTM Gaussian ratio ROI type and integral The calculated values centroid area percent error FWHM FWTM and Gaussian ra tio are computed only when the size of the current ROI meets the following criteria Mr eee soso 256 lt 256 512 2048 lt 512 gt 2048 e 67 Alpha Acquisition and Analysis Time Info The Time Info status page includes acquire start time dead time percentage compu tational preset region elapsed and preset values for the live time real time and com
95. gure 44 allows you to tailor the display of the Ac quisition and Analysis toolbars The dialog is divided into three panes Toolbars Commands and Customize Buttons Toolbar Setup Toolbars Commands Customize Buttons Toolbars z Y Show Tooltips New I Cool Look z Reset calar rene Defaut Figure 44 Toolbar Setup Dialog The Toolbars pane allows you to create rename and delete toolbars e To create a new toolbar select the New button This will prompt you to input a name for the toolbar The new toolbar will initially be empty e To rename a toolbar highlight it in the list and edit the name in the edit box below the list 65 Alpha Acquisition and Analysis e To delete a toolbar highlight it in the list and select the Delete button You may also enable disable the Tooltips and Cool Look features of the toolbar The Commands pane allows you to customize the command buttons that will appear on your toolbars The list on the left contains a variety of categories of commands or ganized in a similar fashion as the main menu Selecting a category will change the command buttons that appear in the Button area of the pane Selecting a command button will show that button s description in the Description field To modify the toolbars e To add a command button to a tool bar select the button you want to add from the Buttons area of the pane Then hold the left mouse button down drag the command button t
96. h as the expand rectangle is moved in the main spectral display If the box is not checked the expand window does not update until the mouse movement is complete Spectrum Labels These selections let you add x and y axis gridlines to the spectral display and tickmarks to the x and y axes of the display X Axis Ticks Labels Selecting X Axis Ticks Labels creates X Axis labels on the spectrum display These may be displayed in terms of Channel or Energy See X Axis as Energy X Axis Gridline Selecting X Axis Gridline creates X Axis gridlines on the spectrum display Y Axis Ticks Labels Selecting Y Axis Ticks Labels creates Y Axis labels on the spectrum display Y Axis Gridline Selecting Y Axis Gridline creates Y Axis gridlines on the spectrum display X Axis as Energy Selecting X Axis as Energy displays X Axis labels in terms of energy If this is not selected the X Axis will be displayed in terms of channel MCA View The MCA View selections let you modify the apperance of the application s interface and select the data it displays 64 Display Menu MCA Only Menus Select the MCA only menus checkbox to remove the Analyze menu from the applica tion s menu bar and the Efficiency items from the Calibrate menu Control Panel Shown Removing the check from the Control Panel checkbox will remove the Control Panel from the display leaving more room for the spectrum Toolbar Setup The Toolbar Setup dialog screen Fi
97. hannels to keep the continuum fixed across the spectrum The specified number of FWHMs or the specified number of continuum channels will be used on both sides of the peak to establish the continuum under the peak ROIs If you plan to use either the Cursor or the Marker method and the calibration peaks are very close to other peaks you should set the continuum mode to Channels and set the value in the Channels text box to a small number The Cursor and Marker methods do not use the expected FWHM information even when it is available If you plan to use the Auto button you may set the continuum mode to FWHM If you plan to use a mixture of both modes both parameters should be set appropriately Analysis Sequence Description The Analysis Sequence Description dropdown is a list of the currently defined se quences on your system Selecting one of the sequences will direct efficiency calibra tion to execute the peak locate and peak area engines of the selected sequence when the Auto button is pressed The default selection is NONE Calibrate Energy Only Calibration The standard energy calibration includes low tail and FWHM values For a simpler energy calibration this function Figure 15 allows you to enter the calibration using only energy channel pairs either by the Cursor method or the Manual Method If only one energy channel pair is entered a second pair will automatically be generated as lt energy channel 1 gt when you exit the
98. hoose Ascending to show Nuclide ID labels with their text oriented bottom to top Descending Choose Decending to show Nuclide ID labels with their text oriented top to bottom Display Peak Information When Display Peak Information is checked moving the mouse cursor over an identi fied peak will display the peak s Nuclide ID Energy Net Area with percent error and Activity optional in a bubble Figure 43 e The Energy Units page 63 are chosen in the Display Preferences dialog e The Activity Units are chosen in Interactive NID page 69 in the Display Preferences dialog The activity value will be correctly displayed for the selected unit but the unit itself is not displayed Show Activity Check Show Activity to add Activity data to the Peak Information bubble Figure 43 This checkbox is enabled only if Display Peak Information is checked Display Menu Nuclide IDs va o Peak pai Nuclide C0 60 Energy 1332 5 keV Net Area 12912 7 a En a o g oa a a o HG 203 SE 75 KR 85 SR 85 156 6 gt Activity 00971557 10 0 2 CO 57 675 ee Z 05 134 BI 214 Figure 43 Nuclide IDs and Co 60 Peak Information Nuclide Identification Source These radio buttons are enabled only if one of the Peak Labeling checkboxes is checked Library Lines Choose Library Lines to display peak bubble information from the Nuclide Library chosen in Interactive NID setup page 69 When you use Li
99. ide Data Append to Existing Calibration When adding energy points to the current datasource from a file such as in construct ing a composite efficiency file there may be common energy points in the two files If the Append to Existing Calibration checkbox is selected the system will ask if you want to append to the existing calibration If you answer yes it will tell you each time it finds a duplicate entry Additional Nuclide Information In addition to entering the nuclide s assay date and time and its activity units this screen lets you enter the percent uncertainty and change the activity units General Information These text boxes let you enter or change assay date and time and the activity units The Assay Date is the date and time when the source was measured you must enter both Though Activity Units defaults to Ci you can choose another unit for reporting nuclide activities The Conversion Factor defaults to the proper value for converting Bq to uCi If you choose the last item in the Activity Unit list lt gt you can type in the 25 Alpha Acquisition and Analysis name of any other unit then enter the Conversion Factor that will convert your units to UCI Nuclides Highlight a nuclide in the list box to enter or edit its Activity and Percent Uncertainty data When you ve finished editing that nuclide select Change This will copy the data to the list file and move the highlight to the next nuclide
100. iet ae Be ae em de le a wig 10 SBUZ iaa aye ee ee E 11 Amplifier s eoa a 6a 6 eS HRS e HEHE EER EEL RE RY eRe ee OH 13 High Voltage cuac Os ee Rae ee ee Gh are Ge e 15 Power Manager soucs Seg ex aoe aad a Gl ew ge a Sew we we ae 16 SEALS en ob Reet ew ew ee a ew ek et the ae tl ee ee a 17 PNG ANCES caries are vg or A e dr de a ees Se eek ee ee oe ees ee y 18 LOdd s sed ae be bo eee eee EE HER AE oe ed ew RS Os 18 Calibrate jc i e he ae a eae A aia Ree a Gk ee Bee dd 18 SEP a pes Dob ana e Aen BG gard bo OEE ee a 19 Energy Only Calibration ce tiegi ee 21 Enerey COeiicients acom BSE de a or E ES ee we wh gw E 22 Energy Pull ace a a do gara ROR e ER RRR B eR a ROE Eases SE a 22 By Certificate Pile i co vce a RE ee ae a ee ee i 23 By Nuchid List osis 6 0 aoa a Be ee ee ee oe i ea aa 24 By Calibration Pile cee abe ebe bees BPR HEE SESE RSE EE HR eS 26 By BMY 4 5 e gae wage eh A a chee ap ae o ae hw Sea Baan de done eee S 27 En rey SHOW escindida SO ED eel dwn Hea Ree GaSe ed wane d 28 Energy Calibration Full s asce sru eeey ee e e 29 Energy Recalibration s 5 4 2 6 4 6 ewe wh oe a oe SER Se ee eS 31 is oe 6 ech RR RHEE DE HEELERS ER ESS RE ERE ERED ES BES 32 By Certificate Pile ns sue eG es al hw ew ee a wd ed 33 By Nuchde Lists yaa shaded tage SM ath ee ed ee Madea AAA 34 By Calibration Fil care ete Gabe eee eb ee ee A 36 BED eeng i pe Ae Oh eg ae Bees O kell de ates ce dada ree 37 Efficiency
101. igure 41 which allows you to visually com pare the current reference spectrum with spectral data from another open datasource This function is not available if only one datasource is open Note that Compare and Expand page 55 can be enabled simultaneously Compare nbestd cnf r Cancel Help Figure 41 The Compare Dialog The spectrum selected for compare will automatically be energy normalized to the ref erence spectrum That is the compare spectrum s energies will be aligned with the same energies in the reference spectrum Once the compare datasource is selected you ll see the compare spectrum displayed in the currently selected compare spectrum color Preferences on page 60 just above the reference spectrum If you change the reference datasource by selecting a different spectrum the Marker Info status page information changes accordingly Only one energy calibration that of the reference spectrum is meaningful for the set of compared spectra Move the Compare Spectrum When Compare has been turned on you can move the compare spectrum by clicking on the VFS box in the upper right hand corner of the display window the VFS box will change to the color of the compare spectrum or by selecting Display Compare VES The mouse cursor will change to a solid double headed vertical arrow Use the mouse or the cursor keys to position the compare spectrum anywhere within the spec tral display Display Menu
102. ile can be edited with the Analysis Sequence Editor which is de scribed in detail in the Using the Analysis Sequence File Editor chapter in the Genie 2000 Operations Manual Store Store allows you to save an analysis sequence as a file on disk These files will appear in both the Analyze menu page 70 and the Load screen s sequence descriptions 104 Options Menu Execute The Execute button executes the currently defined analysis sequence which is the se quence of steps listed in the Current Steps list box Options Menu The Options Menu lets you Change the Operator s Name perform Strip and Smooth and work with the Report Window Change Operator Name Selecting Change Operator Name lets you to enter or edit an operator name This name will be stored in all currently opened datasources whenever various phases of analysis and calibration are performed Interactive NID The Interactive NID option Figure 73 brings up a modeless dialog allowing you to see a graphical connection between the location of the spectrum cursor and the nuclides in a library Interactive NID x Library D AGENIE2KACAMFILESASTDLIB NLB BR 84 1741 BR 84 1877 BR 34 1897 ER 85 514 ER 35M 151 ER 85M 304 SR 85 514 ER 37 402 ER 87 673 KR 37 345 32m 32m Sort by 32m Nuclide 3915 4d 4 5h C Energy 4 5h 65d 76m aby Show 76m confirming lines Setup Pro nownow nn Figure 73 The Interactiv
103. ing nuclide activities enter that unit here Since the activities are stored in microcuries you ll have to enter a factor to convert microcuries to your units if you want to use Bq for instance enter 37000 here Print Spectrum The Print Spectrum dialog Figure 66 lets you set the parameters that control the way a hard copy printout of the spectrum will appear VFS Choose either Linear or Log for the vertical full scale of the graph Max Counts The maximum number of counts can either be determined automatically or chosen by the user from the drop down list This maximum must be determined automatically if a second spectrum is to be overlaid for comparison purposes 95 Alpha Acquisition and Analysis wy Print Spectrum VFS Linear Log Max Counts Auto T ROI max range 1024 Start Channel End Channel I Compare to other datasource P Full channel display no compression Cancel Help Execute Figure 66 The Print Spectrum Dialog ROI To print only a part of the spectrum check ROT then enter the region s starting and ending channel numbers The starting channel must be at least 1 The maximum num ber of ROI channels that can be printed is 1024 Compare to Other Datasource To overlay your current spectrum with that of a second datasource check Compare to other datasource and either Select the datasource or type in a fully specified datasource path for any
104. inter will change to a outlined arrow with two heads Using the cursor the rectangle can be grabbed at a corner or side and stretched to a new height or width or both Scale The Scale menu lets you select the method of setting the display s vertical full scale auto or manual and the scale type linear or log The scale type you choose can be saved as a permanent setting see Preferences on page 60 Manual Manual lets you adjust the display s vertical full scale either by using a mouse to change the scroll bar at the right side of the spectrum display or by pressing the key board s up arrow or down arrow key Pressing the F5 key will toggle between Manual and Auto Auto Selecting Auto lets the program automatically set the display s vertical full scale VFS As the spectrum grows the VFS is automatically reset to show all of the data Pressing the F5 key will toggle between Auto and Manual Note that if you use the scroll bar while Auto is enabled the program will change the scale mode to Manual Linear Linear defines the vertical scale of the display as a linear scale Log Log defines the vertical scale of the display as a logarithmic scale Compare The Compare command lets you turn the compare function on or off and when on lets you position the compare spectrum by specifying its vertical full scale VFS 57 58 On Alpha Acquisition and Analysis Selecting On displays a dialog box see F
105. item and choosing any of the open datasources The current datasource has a heavy border around its display and its name is displayed in the Title Bar Single click on any one of the display areas to make it the current datasource Double click on any one of the display areas to make that datasource a full screen display Workspace Files The workspace function allows you to save a specific configuration within the Alpha Acquisition and Analysis AAA package For example if you have a four detector system a workspace file can be created that allows you to open all datasources detec tors at once by selecting the saved workspace file from the menu selection Workspace files are created when a current Acquisition and Analysis configuration is saved to a workspace file A workspace file normally never needs to be edited but the following information is provided if a workspace file needs to be created or edited out side Acquisition and Analysis Workspace files are ASCII files written in a INI file format These files control the datasource s opened and the display options selected by the Acquisition and Analysis windows when a workspace file is loaded These files have a GWS file extension for mvcg exe Gamma and a AWS file extension for mvca exe Alpha INI files or profile files as they are sometimes called have a standard format Each file is divided into sections Each section is marked by a name of the section in brack ets i
106. later analysis Tail curves Low is normally chosen for calibrating Alpha spectra because they ex hibit tailing on the low energy side of the peaks Choose None to turn off this calibra tion function Continuum None is normally chosen when calibrating Alpha spectra but you can choose to establish the continuum under the peaks by selecting either a Linear function or a Step function The Linear function is adequate when the continuum is relatively flat It is a simple straightforward equation that estimates the continuum under the peaks as a trapezoid The Step function would be chosen if there are any regions in the spectrum where the continuum is significantly higher on the left side of a peak region than on the right side This function automatically reduces to a flat line when the con tinuum is flat The Channels parameter is not available when Continuum is set to None the normal choice for Alpha spectroscopy When used it establishes the continuum under the peak ROIs If you have two peaks that are close together reducing the number of continuum channels may give better results If you have poor peak statistics and there are no other peaks nearby increasing the number of continuum channels establishes the continuum more accurately but makes it more likely that close lying peaks will be considered as a multiplet instead of as a singlet FWHM or Channels Choose FWHM to let the continuum vary according to the shape calibration Choose C
107. lid and should be performed only when the evaluated gain shift is deemed excessive Al ternatively the datasource can be recalibrated outside of the Gain Evaluator perhaps aided by Save New CAL File below In either case the altered datasource would re quire a new analysis that reflects the changes Detector datasources can be corrected via recalibration see Save New CAL File or gain adjustment via Auto Gain Adjust page 45 Save New CAL File Click the Save New CAL File button to save the calculated energy calibration in a new calibration CAL file This saved CAL file can then be loaded outside of the Gain Evaluator to establish a new corrected energy calibration for the datasource and perhaps other datasources known to have the same energy calibration gain shift Alternatively the datasource can be rebinned to make the current energy calibration valid using Fix File Gain above In either case the altered datasource would require a new analysis that reflects the changes ReEvaluate Click the ReEvaluate button to perform another evaluation on the current datasource using the selected energies The results will be displayed in the plot and the Data Text Box Since the interactive version of the Gain Evaluator initializes with the current NID analysis results when available using a different or altered source of true energies re quires a re evaluation Calibrate Auto Gain Adjust When the gain of a measurement syst
108. log Conv Gain Clicking either on the arrows at the ends of the Scroll Bar or in the area to either side of the Scroll Bar s Slider will change the gain by a factor of two over the control s range of 256 channels to the maximum number of channels supported by the MCA LLD The ADC s Lower Level Discriminator LLD can be set as a percentage of the ADC s full scale input ULD The ADC s Upper Level Discriminator ULD can be set as a percentage of the ADC s full scale input The window between the LLD and ULD settings is used as a filter to limit the en ergy range to be considered by the ADC Only signals within this window will be con verted Zero The ADC s Zero is factory set for each conversion gain so that a Zero setting of 0 corresponds to zero intercept zero energy input stores in channel 3 the first channel used for spectral data storage for that conversion gain The Zero control can be used to change the zero intercept to another channel 10 MCA Menu Offset The ADC s Digital Offset shifts the memory assignment of the ADC s conversions With no zero offset the ADC s channel numbers are the same as the memory assign ment s channel numbers For example if the Gain is programmed to 8192 and the memory assignment is only 4096 an Offset of zero will allow only the lower half of the full scale conversions to be stored But if the Offset were set to 4096 channel 4096 of the ADC
109. ly range from 10 seconds to several minutes depend ing on the source intensity and desired Percent Gain Shift Tolerance A typical button source in the 37 Bq 1 uCi range placed at the detector will probably provide suffi cient counts depending on branching ratios after about 30 seconds Optimizing the Preset Live Time may initially require some experimentation Percent Gain Shift Tolerance The Percent Gain Shift Tolerance is the percent deviation that the average gain correc tion factor can deviate from unity after a successful gain adjustment Given sufficient acquisition time to adequately determine peak centroids a Percent Gain Shift Tolerance of 1 or less for high resolution HPGe detectors and perhaps up to several percent for low resolution Nal detectors is usually a good starting point Optimizing the Percent Gain Shift Tolerance in conjunction with the Preset Live Time may initially require some experimentation Adjust Zero Check the Adjust Zero box to cause the ADC zero to be adjusted after each iteration The checkbox is enabled only when the ADC allows computer controlled zero adjust ments A zero adjustment cannot be performed unless the lowest matched energy is less than 1 3 of the highest matched energy Note A shift in zero tends to be much less likely than a shift in gain Unless a zero shift is suspected it is recommended that Adjust Zero not be specified QA Transfer Before After Check the Before box to tr
110. me 0 50 Live secs 6845 00 Prev Comp Preset Region Real secs 6879 22 0 0 channels Total cnts 0 00 Figure 40 A Typical Expanded Display When the expand window is the desired height release the mouse button The mini mum height for the expand window is 50 pixels Note that Expand and Compare page 57 can be enabled simultaneously Expand On The Expand mode can easily be turned on by clicking on the Control Panel s Expand On button or by pressing the F8 key You can also choose Display Expand to turn the expanded display mode on or off Expand Off The Expand mode can easily be turned off by clicking on the Control Panel s Expand Off button or by pressing the F8 key You can also choose Display Expand to turn off the expand function and return the display to the normal state The Expanded Spectrum Spectrum expansion takes place around the current cursor location The spectrum s ex panded data is the data inside the rubber rectangle dash outlined box in the lower half of the display The expanded half of the display can be moved through the spectrum by putting the mouse pointer inside the rubber rectangle in the lower half and dragging it to a new location When the mouse pointer is inside the rubber rectangle it will change to a four way arrow as seen in Figure 40 56 Display Menu The rectangle can be resized by moving the mouse pointer to an edge of the rectangle The mouse po
111. me This procedure is described in the Ad justing the TRP Reset Pulse section of Appendix D Technical Information in the Genie 2000 Operations Manual High Voltage Click on the HVPS button to see the dialog box in Figure 10 which shows a typical HVPS adjust screen The controls you see on your adjust screen may vary depending on which HVPS you assigned to this datasource HVPS C PwrMgr Gain Filter 3000 0v OK El MECO a Voltage HYPS Reset Figure 10 Typical High Voltage Adjust Dialog Voltage The Voltage scroll bar sets the output of the HVPS between the minimum and maxi mum settings of the Voltage Limit control set in the MID Editor The voltage can also be typed in from the keyboard then accepted with the Ok button within the control Status If the Power Manager described in the next section is in the Battery Full mode or the AC Full mode you can turn the HVPS On or Off In the Battery Save mode you can set the HVPS to Armed or Off If Armed is selected the HVPS will be automatically turned on when acquisition starts HVPS Reset The HVPS is turned Off when a fault caused by an overload or an Inhibit occurs with an Inspector HVPS After the fault condition has been cleared click on HVPS Reset to reset the HVPS then turn it On again with the Status control Clear Ov In Latches When a fault caused by an overload or an inhibit occurs with an ICB HVPS its Over load and
112. mits The detection limits step contains the algorithms to perform Curie MDA or KTA MDA used for German regulatory compliance and LLD calculations The MDA algorithm calculates the MDA values for all the nuclides as described in the MDA Calculations section of the Algorithms chapter in the Genie 2000 Customiz ation Tools Manual Analyze Menu If applied to a spectrum collected with a blank sample or in an empty shield this cal culation is equivalent to an LLD calculation MDA Confidence Factor The MDA Setup screen shown in Figure 61 lets you select the MDA Confidence Fac tor which can be set to any value between 0 1 high and 40 low for calculating detection limit values For instance to use the NRC 95 confidence factor you would enter 5 00 here Y Minimum Detectable Activity HDA Setup Ea Confidence Factor 5 00 ce I Use variable MDA constants Add Constant 277 Moller 465 Generate Report Cancel Help Execute Figure 61 MDA Setup Note that the Confidence Factor is used both here and for the Nuclide Identification al gorithms described in the Basic Calculations section of the Algorithms chapter in the Genie 2000 Customization Tools Manual If the Confidence Factor is changed here the NID calculations are affected too unless the factor is changed again in the NID Setup screen before performing the NID calcu lation Perform Variable RO
113. n the current datasource as described in the Subtraction of Peak Environmental Background section of the Algorithms chapter in the Genie 2000 Customization Tools Manual g Setup for Standard Bkg Subtract x Bka File Select I 95 Critical level test Tolerance 1 00 ke Energy FWHM Cancel Help Execute Figure 55 The Standard Background Subtract Setup FT Generate Report Background File Type in the fully specified name of a background CNF file to be used in the subtrac tion or click on Select then choose a file from the file open dialog box 95 Critical Level Test The 95 Critical Level test may be enabled or disabled for this phase of the calcula tions If the test is enabled the net peak area of a singlet after the background subtract must exceed the 95 Critical Level value as described in the Critical Level Testing section of the Algorithms chapter in the Genie 2000 Customization Tools Manual If the Critical Level test is not enabled all peaks are retained even if their areas are zero or negative after the background subtract 81 Alpha Acquisition and Analysis Tolerance Enter a tolerance value either fixed Energy or variable FWHM to define how large a difference can be allowed between a peak in the current datasource and a peak in the background datasource and still be considered the same peak The tolerance value can also be specified in the Calibrati
114. near 0 to define the display s scale as Log Expand 1 On 0 Off Set Expand 1 to change the display mode to expanded Set Expand 0 to restore the display mode to normal page 55 Compare 1 On 0 Off Set Compare 1 to turn the compare function On Set Compare 0 to turn the compare function Off page 58 CompareDS datasoure file name or Detector name The CompareDS key value should contain the name of the datasource to be used to compare with the other loaded datasources The name can be either a detector name or a fully qualified CAM file name i e CompareDS C GENIE2K CAMFILES Naidemo cnf Example Alpha Spectroscopy Files For your convenience installing the S509 Alpha Spectroscopy Analysis program adds a collection of example files that you may want to refer to while you are setting up your system for alpha spectroscopy Examining these files can provide you with addi tional information on how to properly structure the sequence of events in an Analysis Sequence File ASF to correctly analyze your alpha spectra There are eight files in your GENIE2K CAMFILES directory which contain spectral data for field samples and reagent blanks for the elements americium plutonium tho rium and uranium The file names are Am1000 cnf Amblank cnf Pu1000 cnf Publank cnf Th1000 cnf Thblank cnf U1000 cnf Ublank cnf The four 1000 cnf files contain the spectral data for field samples and the four blank cnf files contain the spectral da
115. nergy points in the two files If the Append to Existing Calibration checkbox is selected the system will ask if you want to append to the existing calibration If you answer yes it will tell you each time it finds a duplicate entry Editing the List When you select OK you ll see the Energy Calibration Full screen which allows you to examine and if necessary edit the data in any of the lines Please refer to En ergy Calibration Full on page 29 for an illustration and explanation of this screen By Entry Choosing to calibrate By Entry displays a dialog box Figure 21 which lets you man ually enter energy channel pairs to be used in generating the energy calibration coeffi cients for the energy vs channel equation UN Calibration by Entry Ea Energy keV Delete Channel Energy kev Channel FWHM Low Tail Change FWHM Clear Low Tail IV Append to Existing Calibration Figure 21 Calibrate by Entry You must also manually enter FWHM values to be used in generating the shape cali bration coefficients for the FWHM vs energy equations If Low Tail Curve was selected in the Calibration Setup dialog page 19 you are also allowed to manually enter Low Tail values to be used in generating the shape calibra tion coefficients for the Low Tail vs Energy equations 27 28 Alpha Acquisition and Analysis Add Button To create any entry in the list box type an energy value i
116. nto the Energy text box then the corresponding channel number FWHM value in channels and Tail value in channels in their text boxes When the values have been entered select Add You can add these energy channel pairs in any order they will always be displayed in ascend ing energy order Delete Button To remove a line and all its values from the list box highlight the line then select the Delete button Change Button To change any of the values for a line highlight the line edit any of the values then select the Change button to move the changes to the list box Clear Button Instead of editing the values one by one you can remove all values from the text boxes for the highlighted line by selecting the Clear button This will clear all entries at the once Append to Existing Calibration When adding energy points to the current datasource from a file such as in construct ing a composite efficiency file there may be common energy points in the two files If the Append to Existing Calibration checkbox is selected the system will ask if you want to append to the existing calibration If you answer yes it will tell you each time it finds a duplicate entry Editing the List When you select OK you ll see the Energy Calibration Full screen which allows you to examine and if necessary edit the data in any of the lines Please refer to En ergy Calibration Full on page 29 for an illustration
117. ntroid Figure 8 Relationship Between Stabilizer Functions Zero Centroid This control sets the reference channel at the low end of the spectrum for zero inter cept stabilization which prevents interference from the effects of gain drift The cen troid s channel number can also be typed in from the keyboard then accepted with the Ok button within the control To allow the stabilizer to correct for zero drift the count rate in the zero reference peak must be significantly higher than the count rate in the background Gain and Zero Window Controls These controls set the width in channels of the upper and lower sampling windows for each Mode The operation of the stabilizer depends on measuring the count rate in these two windows detecting a difference then providing a correction to equalize count rates Gain and Zero Spacing Controls These two controls set the spacing in channels between the upper and lower sam pling windows for each Mode The windows should be placed so that a shift in the ref erence peak reflects a significant change in count rate through the windows For broad peaks the spacing should be set so that the windows edges are not on the flat part of the peak Gain and Zero Mode Controls The Stabilizer s Gain and Zero or both can be set to Off On or Hold MCA Menu If the drift in either mode zero or gain exceeds the Correction Range the overrange flag will be set and that mode will be changed t
118. nuclide s assay date and time and its activity units this screen lets you enter the percent uncertainty and change the activity units General Information These text boxes let you enter or change assay date and time and the activity units The Assay Date is the date and time at which the source was measured you must enter both Though Activity Units defaults to uCi you can choose another unit for reporting nuclide activities Since the activities are stored in microcuries the Conversion Factor defaults to the proper value for converting microcuries to other units If you choose lt gt you can type in the name of an Activity Unit not shown in the list then enter the Conversion Factor that will convert your units to uCi Nuclides Highlight a nuclide in the list box to enter or edit its Activity and Percent Uncertainty data When you ve finished editing that nuclide select Change This will copy the data to the list file and move the highlight to the next nuclide 35 Alpha Acquisition and Analysis When you ve finished select OK to save this as a full CTF certificate file and re turn to the Calibrate by Nuclide List screen You ll see that all nuclides which have Additional Nuclide Information added are marked by a double asterisk If you are satisfied that all data in the Calibrate by Nuclide List screen is correct you can select this screen s OK to load the file into the energy line editor Editing
119. o be a separate peak and will be merged with the existing peak results table If the Add to existing results box is not checked the current peak results table will be replaced by this search Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase User Specified This method using the parameters in Figure 51 calculates the peak centroid for each displayed ROI in the Search Region as described in the User Specified Peak Locate section of the Algorithms chapter in the Genie 2000 Customization Tools Manual Use MCA View Select this button to perform the Peak Locate using the ROIs displayed in the spectral display Use ROI File Select this button to use an ROI file for Peak Locate Enter the name of the file in the Use ROI File text box or click on Select and choose a file from the file open dialog box Analyze Menu Peak Locate User Specified ROI Setup x m Search Region Start channel fi Stop channel 65535 Use MCA View C Use ROI File Tolerance 1 00 key Energy C FWHM Add to existing results FP Generate Report Cancel Help Execute Figure 51 The User Specified Peak Locate Setup Add to Existing Results and Tolerance If the Add
120. o hold Set that mode to off to clear the overrange flag then correct the cause of the excessive drift before returning the mode to on On enables stabilization for the specified mode allowing the Stabilizer to compare the incoming data to the Mode s Centroid and Window settings then compensate for data below or above the Centroid Off disables stabilization for the specified mode and sets the correction adjustment to zero and clears the overrange flag if it was set Hold disables stabilization for the specified mode but maintains the current correction adjustment at the Stabilizer s output Amplifier Click on the Amp button to see the dialog box in Figure 9 which shows a typical ad just screen for a programmable amplifier The controls you see on your adjust screen may vary depending on which amplifier you assigned to this datasource Click on the Next button to see the PUR and Pole Zero controls Coarse gain Fine gain fu 40 y 0 313 E i gt 0 13 1 00 Figure 9 Typical Amplifier Adjust Dialog Coarse Gain The Amplifier s Coarse gain setting is selected from the drop down list For most con figurations it s best to choose the highest Coarse Gain which combined with the Fine and S Fine Gains will produce the total desired gain Fine Gain and S fine Gain The Fine Gain and Super Fine Gain controls are set with their Scroll Bars Shaping Mode This control sets the amplifier s shaping
121. o the exact place on your toolbar you wish to place it Then release the left mouse button e To remove a command button from a toolbar select the button from the toolbar and drag it off the toolbar Then release the left mouse button e To add a separator between command buttons on your toolbar select the command button you wish to have on the right of the separator and drag it slightly to the right The Customize Button pane allows you to associate certain command buttons with Analysis Sequences and Executable programs There are 10 special Analysis buttons and 10 special Executable buttons These can be added to any toolbar from the Commands pane Then using the Customize Buttons pane select the appropriate item from alist box and e To change an Analysis Sequence button select the sequence from the drop down Analysis Sequence combo box e To change an Executable button edit the command line in the Executable edit field To browse for a specific program use the Browse button Select OK from the dialog will confirm all changes Cancel will discard all changes The settings only be permanently saved if the Save button is selected in Display Preferences Otherwise the toolbars will return to the last saved state upon the next invocation of the Acquisition and Analysis window Status Page Shown Unchecking the Status Page Shown checkbox removes the Status Page from the dis play leaving more room for the spectrum Checkin
122. oftware you have purchased a license to use the software not the software itself Because title to the software remains with us you may not sell distribute or otherwise transfer the software This license allows you to use the software on only one computer at a time You must get our written permission for any exception to this limited license BACKUP COPIES Our software is protected by United States Copyright Law and by International Copyright Treaties You have our express permission to make one archival copy of the software for backup protection You may not copy our software or any part of it for any other purpose Revised 1 Apr 03
123. on Setup dialog page 19 as Peak Match Tolerance Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase Reagent Correction The Reagent Background Subtract algorithm Figure 56 uses the peak results in the reagent file to establish the ratios of the net areas of the other peaks to the net area of the tracer peak It then subtracts an equivalent fraction from the other peaks in the cur rent datasource The algorithm is described in Reagent Blank Correction section of the Algorithms chapter in the Genie 2000 Customization Tools Manual g Setup for Reagent Bkg Subtract x Reagent Bkg File Select Tracer Certificate File Select I 95 Critical level test Pk Match Tolerance 1 00 PwHM C Energy FWHM TF Generate Report Cancel Help Execute Figure 56 The Reagent Correction Setup This algorithm requires that the reagent file first be analyzed for its peaks using the ap propriate peak locate peak area and environmental background subtract algorithms Note that for proper operation the environmental background subtract must be per formed on the sample spectrum before performing the reagent correction Analyze Menu Reagent Background Fil
124. onment using ANALYZE EXE directly or via REXX regardless of this preference setting Automatic File Naming Check the Automatic file naming box to cause the system to automatically create a new file name each time the Save Datasource step is executed The files are saved in the standard CAMFILES subdirectory and are named sequentially If the box is not checked you will have to specify a file name when the sequence is run The first time this function is executed the file will be named 00000001 CNF and the counter will be incremented by one When the counter reaches 10 it will reset to 1 Note This preference must be enabled for any sequence that includes a Save Datasource step and that will be executed in a command line environment using ANALYZE EXE or REXX directly Efficiency Calibration Check the Import calibration at execution box to indicate that an efficiency calibra tion should be imported at execution If the box is not checked the calibration in the datasource being analyzed will be used Notes No calibration selection prompt will be issued if the analysis sequence is executed in a command line environment using ANALYZE EXE directly or via REXX When an efficiency calibration that includes the specification of a GIS file is imported during an analysis sequence this specification will be overrid den if a GIS file is also specified in either the Sequence Preferences set tings or the NID with Interfe
125. ot The grid is printed as shown with dotted lines File Menu Y Log Scale Check the Y Log Scale box to change the Y axis scale from linear to log The maxi mum number of counts is determined automatically X Energy Scale Check the X Energy Scale box to change the X axis scale from channels to energy Range The entire spectrum will be plotted if the Full Spectrum box is checked If the box is not checked a range of channels can be plotted If an illegal value is entered into ei ther of the channel boxes the word Error will replace the illegal value in the box Print When all parameters have been chosen click Print to bring up the printer selection di alog Plot to Clipboard The Plot to Clipboard command copies the current spectral display including expand window cursors markers to the Windows clipboard as a bitmap This image may then be pasted into other applications such as word processors or paint programs This command can also be executed with CTRL C Print Report Window Selecting Print Report Window will print the contents of the report window to the Windows default printer Export Report to PDF The Export Report to PDF command creates a PDF file of the contents of the Report Window page 111 The standard Save As dialog lets you choose the folder to store the file in Open Workspace The Workspace function lets you save and restore the current Alpha Acquisition and Analysis AAA settings to a
126. p NID range Start channel fi Stop channel 4096 NID library CAGENIE2K1CAMFILESYSTDLIB NLB Select J Perform MDA Test F Inhibit Acg Time Decay Correction Tolerance 1 00 keV NID Confidence threshold MDA Confidence factor 0 30 Energy C FWHM m Cascade correction Coincidence F GENIE2K CAMFILES coi_lib clb library Geometry CY SA Composer file E J Perform cascade correction J Generate Report Cancel Help Figure 60 The NID with Interference Correction Setup MDA Confidence Factor The MDA Confidence factor for NID with Interference Correction is the same that used for standard NID except that there is an added function This factor governs the allowed uncertainty of the activity results which must exceed its own uncertainty times a factor related to the MDA Confidence Factor The smaller the MDA Confi dence Factor the larger the multiplier Note that this factor is applied only if the 95 Critical Level test which is set in either the Sum Non Linear LSQ Fit Peak Area screen page 77 or the Standard Background Subtract screen page 81 is enabled Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase Detection Li
127. pe CAM File y Help Info Figure 1 The Open Datasource Dialog Alpha Acquisition and Analysis Datasource Source When the Detector radio button is selected the Node is dropdown will list all the available local and remote VDMs The list box will show all of the currently selected node s defined input names If the datasource is a multiple memory group detector you can display any of the groups by typing its name into the edit box For example MULTIPLE 3 4 When the File radio button is selected the Look in dropdown will list all the avail able drives The list box will show all of the files and directories in the current direc tory The file name can be typed into the Name edit box or it can be selected from the list box Type When the File button is selected the Type dropdown will list the file format types you can open e When opened any file other than a CAM file will automatically be converted to a CAM file of the same name with a CNF file extension Note For the file conversion routine to work properly the correct file type must be selected before opening the file e If any critical parameters are not available in the selected file appropriate default values will be provided during conversion The converted file will be stored in the same directory as the original file e Old files of the same name as the intended output file name will have their extension changed to b where th
128. re 76 summarizing data about the datasource acqui sition shows the datasource s name and detailed input information Datasource Overview Analysis Calibration Datasource CAGENIE2K1CAMFILESWaidemo cnf Input Information Channels Acq Mode MCA Type AMP Type ADC Type HWPS Type Sample Title Cancel Print Help Figure 76 Acquisition Overview Datasource Name File datasources will be listed as Path FileName MCA datasources will be listed as Detector lt MID input name gt 108 Options Menu Input Information This information describes the physical device used to acquire the datasource The in formation is also available on the Input Info Status Page page 68 If the data is not present the field will be blank Analysis Data The Analysis Data view Figure 77 summarizes data about the analysis that has been applied to the datasource The algorithms used for that step will also be identified If an Analysis Sequence has been stored in the datasource the steps will be displayed A list of files that will be or have been used for an analysis step will also be displayed Datasource Overview Acquisition Calibration Analysis Sequence Description NID Analysis w Report m Analysis Files Peak Locate CAGENIE2K CAMFILES STDLIB NLB Nuclide Identification CAGENIE2K CAMFILES STDLIB NLB gt Analysis Steps Acquisition Peak Locate Peak Area 7 261993 1
129. rence Correction algorithm settings Prompt If Prompt is selected you will be asked to specify the calibration when the analysis sequence starts to run Specify Now If Specify now is selected you ll choose the calibration file now instead of at execu tion time The drop down list shows the efficiency geometry identifier of each CAL calibration file found in the CALFILES directory 103 Alpha Acquisition and Analysis If a calibration file does not specify an efficiency geometry identifier the list will dis play the file name truncated if necessary enclosed in parentheses Note that the effi ciency geometry identifier can be set via Calibrate Store menu selection Cascade Correction Cascade correction does not apply to the analysis of alpha spectra Load Load Figure 72 allows you to load either the steps from the last executed analysis sequence file shown in the File Name box or the sequence of steps from the Current datasource Either of these functions will populate the Current Steps list box with the sequence s steps and will load their associated setup parameters g Load Analysis Sequence File name Bea aie ASF Directory is CAGENIE2KACTLFILESA Seq Descriptions Spectral Data Report Energy Calibration Report NID Analysis w Repott to a file Peak Analysis w Aeport NID Analusis w Rennrt Cancel Current Help Figure 72 Loading the Sequence Any other sequence f
130. s chapter in the Genie 2000 Cus tomization Tools Manual w Peak Locate Unidentified 2nd Diff Setup m Search Region Start channel fi Stop channel 65535 Significance threshold 5 00 Tolerance 1 00 kev Energy C PwHM I Add to existing results I Generate Report Cancel Help Execute Figure 50 Second Difference Peak Locate Setup 73 Alpha Acquisition and Analysis Significance Threshold The second difference algorithm automatically calculates a significance value for each peak it considers The larger the peak with respect to the continuum that it rests on the larger the significance value Only peaks that exceed the Significance Threshold will be accepted as valid For less sensitivity for example to pick out just the large peaks for calibration the Significance Threshold may be raised For more sensitivity the significance limit may be lowered However experience has shown that significance values below 3 00 produce increas ing numbers of false peaks Add to Existing Results and Tolerance If the Add to existing results box is checked each found peak will be compared with peaks listed in the peak results table A found peak that is closer to an existing peak than the specified Tolerance value either fixed Energy or variable FWHM is as sumed to be the listed peak and will be discarded A found peak that is farther away from an existing peak than the specified tolerance is considered t
131. sor Method To use the Cursor Method there must be a spectrum in the Spectral Display area and its cursor must be on the peak that is being used for calibration Select the Cursor button to use the window s cursor channel position to determine an approximate FWHM in order to establish a computed as opposed to displayed ROI and attempt to fit the peak The computed peak centroid computed FWHM and tail values will be calculated and displayed in the list box Now enter an energy value in the Energy text box and choose Accept to add the data to the highlighted list box entry Note that because the Cursor Method uses a relatively unsophisticated routine to deter mine ROI limits it is not the best choice in certain calibrations such as for Nal spec tra The Marker Method is recommended for Nal spectra Marker Method To use the Marker Method there must be a spectrum in the Spectral Display area and its markers must be around the peak that is being used for calibration Calibrate Select the Markers button to use the window s markers to establish an ROI and at tempt to fit the peak The computed peak centroid computed FWHM and tail values will be calculated and displayed in the list box Now enter an energy value in the Energy text box and choose Accept to add the data to the highlighted list box entry The Marker Method is recommended for spectra where there are other peaks close to the calibration peak or when calibrating Nal
132. stic the individual values given for each line in the tabular data indicate which lines in particular might have trouble being properly identified via NID analysis Percent Gain Shift Tolerance is the measured Percent Gain Shift that must be attained to have a status of Completed Successfully The measured shift must be less than the tolerance value Percent Gain Shift is calculated from the weighted average of all of the correction factors of the listed matches and indicates how much gain has shifted Each correction factor is weighted according to respective uncertainties Datasource Energy Calibration indicates the current energy calibration equation Calibrate Calculated Energy Calibration is determined using the true energies and their matched peak channels The current energy calibration quadratic term if any is kept constant during the fit File Gain Adjust File Gain Adjust Figure 37 is available only for file datasources Executing this rou tine shifts the current file s spectral data so that it matches the specified goal energy calibration instead of the current energy calibration File Gain Adjustment makes it easier to add strip or compare spectra File Gain Adjust C GENIE2K CAMFILES Nbsstd cnf Current Energy Calibration E 10 20 0000 ch 2 m Post Adjustment I Reanalyze after Adjustment ASF z Cancel Help Execute Figure 37 The File Gain Adjust Dialog Current En
133. supplied connecting cable If ac power is lost the Power Manager will automatically switch to port B allowing its battery to continue supplying power When ac power is restored the Power Manager will switch back to port A Acq Delay The Acq Delay control enabled only in the Battery Save mode sets a delay time which holds off actual data acquisition until the high voltage has reached its preset value and the internal electronics are thermally stable A minimum delay of one min ute is provided to allow the high voltage to increase to its preset value and the internal electronics to warm up The internal electronics will stabilize to within 0 1 of their final settings in less than five minutes MCA Menu Standby Delay The Standby delay control enabled only in the Battery Save mode sets the amount of time that the system can remain idle neither acquiring data nor communicating with the host computer before it automatically changes to Standby In Standby all electronics except the Power Manager are shut down until the next command is re ceived from the host A setting of 0 minutes will prevent the device from switching to Standby Status Selecting Status shows a Status Report of all devices MCA and programmable front end electronics associated with the current hardware datasource Figure 12 shows a typical Status Report which includes device type serial number and any pro grammable settings that are obtainable from each devic
134. t and for build up time the time the sample is building up on a filter if any Tolerance Value You must set the tolerance value in either energy or FWHM units this value can also be specified as Eff amp Match Tolerance in Calibration Setup on page 19 NID Confidence Threshold The NID Confidence Threshold is used to accept or reject peaks for identification this parameter s range is O low to 1 high MDA Confidence Factor In the standard NID the MDA Confidence Factor is used as the designated MDA con fidence during the MDA test only if Perform MDA Test is enabled Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase NID with Interference Correction If the current spectrum already includes peak area and efficiency correction results the Nuclide Identification with Interference Correction algorithm Figure 60 identifies the spectrum s nuclides and automatically performs an interference correction and weighted mean calculation on them as described in the Basic Calculations and Ac tivity Corrections sections of the Algorithms chapter in the Genie 2000 Customiz ation Tools Manual 87 Alpha Acquisition and Analysis a NID plus Interference Correction Setu
135. t acquisition parameters to be used when starting data collection on hardware datasources E Acquire Setup x m Time Preset Computational Preset None Value a C Integral t ou Chas Start Chan fp Counts Stop Chan fp m MCS Preset Sweep Count pot Cancel Help Execute I Clear Data Time at Start of Acquisition Figure 49 The Acquire Setup Time Preset You can set the Live time or Real time preset for the current hardware datasource in seconds minutes or hours Live time and Real time are mutually exclusive but the chosen time preset can be combined with any one computational preset see next sub section Computational Presets These presets stop acquisition when a computed value you specify is reached When a computational preset is defined the chosen time preset is still active the acquire stop command is issued by the preset that is reached first If you want to use a computa tional preset alone set the time preset to a very large value such as 9000 hours more than one year This insures that the computational preset will be reached first None turns off computational presets and uses only a time preset Integral is a computational preset for the integral of any one ROI The integral Value and the ROI s Start and Stop Channels must be specified The integral preset can t be used with any other computational presets but can be combined with either time pre set Area is
136. t are no farther apart than the Maximum Number of FWHMs Between Peaks are seen as part of a multiplet and will be included in the ROI The calculation of the left and right ROI boundaries is influenced by the Maximum Number of FHWMs for Left Right Limit values The ROI will not be extended be yond these limits even if the data has not leveled out Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase Area Correction The area correction phase contains algorithms to correct the net peak areas before fur ther calculations are made The Alpha Background Subtract algorithm is used when peaks in the sample datasource are to be analyzed as singlets It is commonly used when the calibrated background datasource has no peaks which is typical of alpha background spectra 79 Alpha Acquisition and Analysis The Standard Background Subtract is used when peaks in the sample datasource are to be analyzed as multiplets To use this algorithm the calibrated background datasource must contain the results of a peak area analysis Alpha Background Subtract The Alpha Background Subtract algorithm Figure 54 allows you to subtract back ground regions from peak areas in the current datasource as described in
137. ta for reagent blanks prepared and counted specifically in association with the four field samples Examining the contents of these 115 116 Alpha Acquisition and Analysis eight files will show you representative spectra for these four elements and help you select the appropriate tracer to use when quantitatively analyzing those four elements In the same directory you will also find four nuclide identification library files custom ized for analyzing the corresponding elements Alpha_am nlib Alpha_pu nlb Alpha_th nlb Alpha_u nlb If you examine the contents of these NLB files you Il better understand how custom izing your own nuclide library files can improve the efficiency selectivity and speci ficity of library driven peak searches In your GENIE2K CTLALPHA directory you ll find these four Analysis Sequence files Amtrac asf Putrac asf Thtrac asf Utrac asf They are specifically customized for analyzing the corresponding elements using a re agent blank correction and the customized Nuclide Identification Libraries If you examine the contents of these ASF files you can see useful examples for struc turing the sequence of analysis steps for your particular sample You should take par ticular note of the directory and path names attaches to the various files pointed to in the various steps in the ASF files If you want to model your own ASFs after the ex amples you will need to be certain that each step in your
138. tch 1 000e 000 keV m Tail Curves C None Conversion Factor C Low m Tolerance Units r Continuum Energy Step C Linear None FWHM Toy Channels Channels C FWHM Analysis Sequence Description Cancel Help Figure 14 Calibration Setup Preferences Energy Units Though energies are stored in keV you can change how energy units are shown in the display s dialog boxes and in reports eV keV MeV or Other The proper Conversion Factor for other units is defined as the number of keV units equal to 1 other unit For example the conversion factor for MeV would be 1000 be cause there are 1000 keV units in 1 MeV Tolerance Units For the units to be used for entering tolerances chose either Energy a constant energy value across the spectrum or FWHM the energy varies according to the FWHM calibration Calibration Settings Tolerance Energy Calibration and Peak Match values can be set in terms of energy in the selected energy units or FWHM Energy Calibration Tolerance is used during energy calibration in matching spectrum peaks to the current populated list plus or minus the tolerance value 19 Alpha Acquisition and Analysis Efficiency and Match Tolerance is used during efficiency calibration to match calculated peaks with the peaks in the specified certificate file plus or minus the tolerance value It is also used to match energies and peaks during
139. ted when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name associated with this phase Post NID Processing There are two Post NID Processing algorithms Action Level calculations and Control Recovery LACE The Line Activity Consistency Evaluator algorithm does not apply to alpha samples Action Level Calculations Action Level Calculations are on both identified and unidentified nuclides and will to tal the number of identified nuclides and unidentified peaks These functions are de scribed in the Post NID Processing Algorithms section of The Algorithms chapter in the Genie 2000 Customization Tools Manual 90 Analyze Menu The Post NID Processing setup parameters are shown in Figure 62 E Action Level Calculation Setup xi Sum Action Level 1 Sum Action Level 2 Alarm Level 1 fo Alarm Level 1 fo Alarm Level 2 fo Alarm Level 2 fo I Use MDA values Use upper level values Generate Report Cancel Help Execute Figure 62 The Post NID Processing Setup Sum Action Level 1 Specifies Alarm Limits 1 and 2 for the sum of Action Level 1 values for all nuclides Sum Action Level 2 Specifies Alarm Limits 1 and 2 for the sum of Action Level 2 values for all nuclides Use MDA Values When this checkbox is selected the action level calculation will include MDA values
140. tee ee ee ew D 99 Deleting a step iis sees ae ee Rae es 101 EXEC s oto up dae a 70 105 Inserting asStep 101 Loading e ains ps e ets 104 Select an algorithm 101 Sequence preferences 102 Set up an algorithm 102 SOMN e s 2 one s a BS OE eee 104 Area correction Alpha background subtract 80 Critical level test 81 Standard background subtract 81 Area presel bo awh Seed amp eS 9 72 Assay date setting 25 35 Asterisk in the status report 17 Auto function Efficiency calibration 39 Energy recalibration 32 Automatic Gain adjust o o 45 IA e amp oe ke Ae e Be ae ee 15 VES command ociosas 57 Automatic pole zero 14 Background Alpha subtract algorithm 80 Critical level test alpha 80 Standard subtract algorithm 81 Baseline restorer control 14 Battery power modes 16 BER control eg cet 14 Buildup type sample info 99 Calibration ETTICIENON s iaa a ba es 38 Ejerey full iss 5 Ye eae a eS 29 Energy cursor method 30 Energy full s str ar Be A 22 Energy marker method 30 Leads otros AA sa 99 Preferences error a de 19 SEINES ir ghd ee eee dee eA 19 CAM file Openinga 1 Certificate file F l gii eno eo ORS EB ha x 24
141. ter of the dialog box When you have chosen the Background Datasource and entered the strip factor in the text box at the top of the window click on OK to start the strip process Options Menu al Naidemo cnf D Test_spc cnf nbsstd cnf B Th1000 cnf Pu1000 cnf a Thblank cnf a Publank cnf a U1000 cnf Test_bkg cnf a Ublank cnf Name CNF Type C Detector CAM File Cancel Help T Open as read only Source Source Background fi Info Figure 74 The Strip Dialog Smooth Choosing Smooth Figure 75 lets you smooth the current datasource to decrease or eliminate random data fluctuations You can choose one of six weighted average smoothing algorithms from 3 point to 13 point p FaR C 11 Point C 7 Point C 13 Point Cancel Help Figure 75 The Smooth Dialog 107 Alpha Acquisition and Analysis How Smoothing Works As an example of how smoothing works let s consider 3 Point smoothing which weight averages three channels at a time the current channel and one channel to either side The weighted average value is placed in the current channel then the algorithm moves on to the next channel repeating the process until the entire spectrum has been smoothed Datasource Overview The three Datasource Overviews display a brief summary of the Acquisition Analysis and Calibration parameters stored in the current datasource Acquisition Data The Acquisition Data view Figu
142. the Peak Area routine fits only multiplet peaks but if you check the Fit Singlets check box singlets will also be fitted rather than calculated using the summa tion method Display ROIs If the Display ROIs check box is checked the ROIs resulting from the analysis will be copied to the Display ROIs block in the datasource Analyze Menu The ROI color conventions are Color 1 Singlet peaks Color 2 Multiplet peaks Color 3 Not used Color 4 Not used Reject Zero Area Peaks If the Reject zero area peaks check box is checked any peaks with negative or zero peak areas will be deleted from the peak results table Residual Search When the Perform Search checkbox is selected the algorithm will examine the current datasource s ROIs for hidden components in a peak region those that would other wise not be found by the Peak Locate algorithm A new peak will be added at the highest residual which is separated from the nearest established peak by at least the specified Minimum Separation in FWHM and the limits for that ROI will be re established This process will be repeated until there are no more peaks to be added In most situations the residual search works best when the Fixed FWHM Fixed Tail and Fit Singlets check boxes are selected ROI Limits Determination The Sum Non Linear LSQ peak area calculations rely on these three parameters in de termining whether multiplets are to be included in an ROI Peaks tha
143. the ROI Index buttons to scroll through currently defined ROIs The integral preset is mutually exclusive with all other computational presets but can be combined with either a live time or real time preset MCA Menu Area is a computational preset for the area of any one ROI The area value and the ROT s Start and Stop channels must be specified The ROI channels will default to the current computational preset if there is one otherwise the default ROI channels will be 1 to the highest channel number You may replace the default by entering Start and Stop channel values manually or by using the ROI Index buttons to scroll through cur rently defined ROIs The area preset is mutually exclusive with all other computa tional presets but can be combined with either a live time or real time preset Counts is a computational preset for total counts in a single channel within the chan nel range specified by the Start and Stop channels The Value which must be speci fied indicates the number of counts which will stop acquisition The counts preset is mutually exclusive with all other computational presets but can be combined with ei ther a live time or real time preset MCS Preset The MCS Preset is available only when the MCA is set to MCS mode Sweep counts selects the number of sweeps to be performed during MCS data acquisition Dwell time is set on the hardware MCS unit Clear There are two options for clearing the spectral display
144. the activity units for each nuclide To add this data see Additional Nuclide Information in the By Nuclide List section on page 25 Dpen Certificate File Lookin E Camfiles El el l a U232 ctf File name Files of type an Certificate Files CT Cancel Help Info TF Append to Existing Calibration Figure 17 Calibrate by Certificate File When you have highlighted the certificate file name you want to use you can either select Info to see more information on the file or select OK to load the file into the energy line editor Append to Existing Calibration When adding energy points to the current datasource from a file such as in construct ing a composite efficiency file there may be common energy points in the two files If the Append to Existing Calibration checkbox is selected the system will ask if you want to append to the existing calibration If you answer yes it will tell you each time it finds a duplicate entry Editing the List When you select OK you ll see the Energy Calibration Full screen which allows you to examine and if necessary edit the data in any of the lines Please refer to En ergy Calibration Full on page 29 for an illustration and explanation of this screen 23 Alpha Acquisition and Analysis By Nuclide List Calibrating By Nuclide List lets you choose a nuclide list Figure 18 as a source of nuclide lines You can
145. time constant for use with different detectors 13 Alpha Acquisition and Analysis PUR This control turns the amplifier s Pileup Rejector PUR On or Off When PUR is on a Live Time correction is performed for pulses that are piled up A procedure for ad justing the Pileup Rejector for optimum performance is described in the Adjusting the PUR LTC section of Appendix C Technical Information in the Genie 2000 Opera tions Manual BLR Mode The BLR baseline restorer control s the Asymmetrical mode which normally offers superior high count rate performance for high resolution Ge spectroscopy The Sym metrical mode is used on Ge systems with high noise levels scintillation and propor tional detectors and Si systems The Symmetrical mode should always be used for detector systems which exhibit baseline discontinuities resulting from excessive noise and or high voltage effects preamp reset pulses and preamp secondary time constants Secondary preamp fall time constants result in unipolar output undershoots making it difficult to optimize the am plifier preamp matching Pole Zero The amplifier s pole zero which must be changed whenever the Amplifier s Shaping is changed or a different detector is used can be adjusted automatically or manually Auto P Z Click on Start to start the amplifier s automatic pole zero optimization process which is required before acquiring spectra with RC type preamps For auto pol
146. tion Failure to do so may greatly affect the accuracy of the results Use Results Button The Use results button will retrieve peak analysis results directly from the current datasource and populate the list box This button will be disabled if peak area analysis results are not present Show Button Select the Show button to display the efficiency calibration curve as a graph Please refer to Show Efficiency on page 39 for a complete discussion and an illustration of this function Show Efficiency Selecting the Show Efficiency menu item or the Show button on some screens will display the efficiency calibration as a graph Figure 32 39 Alpha Acquisition and Analysis E Alpha Efficiency Calibration m Measured Calculated is ee ME Energy ke Datasource D GENIE2K CAMFILES nbsstd cnf Eff 1 002e 003 Cancel Help List Pks Print Figure 32 Show Efficiency Calibration Scale You can choose the scale of the graph Linear or Log Log in the Scale box Peak The Peak text box lets you eliminate outlying peaks one at a time Enter the number of the peak to be dropped then select Drop Pk The peak will be deleted from the list and both the curve and the equation will be regenerated You may repeat Drop Peak until satisfactory results are obtained but you can t reduce the number of data points to less than three List Peaks Select the List Pks button to display a list of the peaks used in
147. to existing results box is checked each found peak will be compared with peaks listed in the peak results table A found peak that is closer to an existing peak than the specified Tolerance value either fixed Energy or variable FWHM is as sumed to be the listed peak and will be discarded A found peak that is farther away from an existing peak than the specified tolerance is considered to be a separate peak and will be merged with the existing peak results table If the Add to existing results box is not checked the current peak results table will be replaced by this search Generate Report If the Generate Report box is checked a predefined report will be generated when this phase is executed and will be displayed in the application s report window The report is defined in the AEF file as the Report Template Name and Section Name asso ciated with this phase Library Locate Simple The Simple Library Peak Locate setup screen is shown in Figure 52 The analysis will include the library energies included within the Search Region or that are equal to ei ther region limit The current energy calibration will be used to determine whether a li brary peak falls within the Search Region Nuclide Library The name of the library in the current datasource will be shown in the Nuclide Library text box To select another library click on Select then choose a library file from the file open dialog box TO 76 Alpha Acquisition
148. true energies and the current peak search results for found energies Gain Evaluator C GENIE2K CAMFILES Nbsstd cnf m Source of True Energies True Energies Nuclide SER Current NID Analysis Results y al Select All C Certificate File y C Nuclide Library Y 10 True Energ Inputis Sufficient required energies 13 supplied energies 27 Outputis Reliable required matches 7 output matches 20 Tolerance Factor 0 17 Average ShifvFVWHM Fraction 0 01 Percent Gain Shift 0 029 Datasource Energy Calibration E 1 02E 001 4 567E 001 Ch 0 000E 000 Ch 2 Calculated Energy Calibration E 1 02E 001 4 567E 001 Ch 0 000E 000 Ch 2 J X Cancel Help Print Report Fi File Gain Save New CAL File Figure 34 Gain Evaluator Dialog 41 Alpha Acquisition and Analysis Interactive vs ASF Evaluation The Gain Evaluator can be run interactively or as a part of an analysis sequence In the interactive mode you can select any or all of the energies in the True Energies list box When used as a step in an Analysis Sequence File energies can t be selected the routine will use all of the energies in the specified Source of True Energies Source of True Energies Select the source of energies to be used in performing the Gain Evaluation e The Current NID Analysis Results e A Certificate File e A Nuclide Library File Ideally the source of true energies should list energies that correspond to all
149. udes an efficiency correction which requires the detector to be efficiency calibrated to the source specified in the certificate file the emission rate information is used with measured count rate data to help match found peaks to certifi cate lines Otherwise only the energy information is used for matching Single Double Convergence Select either Single or Double convergence to determine whether the routine com pletes successfully after getting the average gain correction factor to satisfy the speci fied Percent Gain Shift Tolerance either once or twice successively Double convergence may minimize any possible overshoot or undershoot bias but requires more iterations Iteration Limit Specify the maximum number of iterations that can be performed If convergence is not obtained before the specified limit is reached the algorithm will stop with an error The typical number of iterations required to reach convergence depends on the Preset Live Time as compared to the source intensity and the Percent Gain Shift Tolerance Reasonable settings usually result in convergence within 3 iterations so 5 might be a typical Iteration Limit setting 47 Alpha Acquisition and Analysis Preset Live Time Select the live time in seconds that each iteration s data acquisition is to be performed This acquisition time should be long enough to provide adequate statistics for a suc cessful peak search analysis The acquisition time may typical
150. ue energy is the difference between the true energy and the corresponding matched found energy Error Bars Error bars plotted at each point show the uncertainty in energy shift at each matched true energy Fit to Data Points The solid line represents the fit to the data points If the solid line is sloped gain has shifted If the solid line doesn t pass through the origin zero has shifted A perfect en ergy calibration would have a flat horizontal line passing through the origin 43 Alpha Acquisition and Analysis Data Text Box The Data Text Box shows the data similar to the Auto Gain Adjust dialog s Data Text Box page 51 These evaluation results are concatenated with any previous results during the current session Key data to focus on includes the reported reliability of the results evaluated percent gain shift and corresponding shift FWHM fraction Review the table of energy matches to assess whether the match results and evaluated gain shift seem logical The shift FWHM fraction s provide an indication of whether NID analysis should be suc cessful given the NID energy tolerance used for the analysis when specified as FWHM Fix File Gain Click the Fix File Gain button which is enabled only for file datasources to execute a a File Gain Adjustment page 53 with the calculated energy calibration as the goal en ergy calibration This causes a rebinning of the spectrum to make the current energy calibration va
151. would be shifted down to correspond to channel zero of the memory This offset would allow the upper half of the full scale conversions to be stored in the assigned MCA memory Stabilizer Click on the Stab button to see the Stabilizer Gain dialog box in Figure 7 which shows a typical stabilizer adjust screen The controls you see on your adjust screen may vary depending on which stabilizer you assigned to this datasource Stab C HVPS C PwrMgr Gain Filter Gain centroid m Gain window Gain spacing 7680 ch 8 chs 64chs Next Prev i ES A mj 10 16378 1 128 2 512 Hold Figure 7 Typical Stabilizer Adjust Dialog Figure 8 shows the relationship between several of the Stabilizer s functions After setting the Stabilizer s controls perform a File Save so that the next time this datasource is selected the proper setting will be loaded into the MCA Gain Centroid This control sets the reference channel at the high end of the spectrum for gain stabili zation since gain drift is more pronounced in the upper channels The centroid s chan nel number can also be typed in from the keyboard then accepted with the Ok button within the control To allow the stabilizer to correct for gain drift the count rate in the gain reference peak must be significantly higher than the count rate in the background 11 12 Alpha Acquisition and Analysis Spacing Window Window Ce

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