S506 Interactive Peak Fit User`s Manual
Contents
1. 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 INCLUDING 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 damage2. change the peak filters from within IPF by pressing the Filter button You ll see a dia log box similar to the one in Figure 1 which is described in Starting IPF on page 1 The only difference is that you ll close the dialog box with an OK instead of an Exe cute To apply the new filter settings press Prev or Next Report Pressing the Report button brings up the Fit Region Report shown in Figure 6 which displays more information about the current peak region The report window can be moved if it is covering a part of the IPF window that you d like to look at Note that the items labeled Iterations and Chi square will be zero for all single peaks that are analyzed for areas with a summation method Batch Procedure Command PjPeak Region Report Region Start 960 553 keV Iterations 7 Region End 972 371 keV Chi square 0 8 Nbr Energy Centroid Area ZError 964 617 1919 25 11165 47 3 87 1 914 968 771 1927 69 32758 28 3 15 1 917 ss Figure 6 A Typical IPF Report Plot Press the Plot button to output a plot of the current peak its residuals and a header Figure 7 on page 14 shows the information included in a typical plot Set Bkgnd Chns The Set Background Channels function is enabled only if the current peak fit algo rithm supports independent left and right background channels To set new background channels position the left and right markers on one side of the region so that they enclose
3. the new continuum channels on that side then click on Set Bkgnd Chns Repeat this process on the other side of the region if you want to set new background channels there as well Note that there can be no overlap between the continuum channels and the peak region itself but there can be a gap between the continuum channels and the peak region Batch Procedure Command In addition to using IPF in the interactive mode you can run it with a Batch Procedure Command For more information on batch procedures refer to the Batch Procedure Reference chapter of the Model S561 Batch Tools Support Reference Manual with specific reference to the IPFIT command and its qualifiers 13 14 Interactive Peak Fit Datasource C GENIE2K CAMFILES Cernipf cnf Sample ID CERNOBYL Iterationg Sample Date86 04 26 0 05 00 Chi square 0 80 Fit EnginSum Non Linear LSQ FitRegion Sta 960 553 keV Bkgnd Type Step Region End 972 371 kev Nbr Energy Centroid Area Error FWHM L 964 617 1919 25 11165 47 3 87 1 914 2 968 771 1927 69 32758 28 3415 1 917 1500p Figure 7 A Typical IPF Plot Index A Adding Apek sig ire amp oie oa 6 Peaks from acquisition window 5 Adjusting the peak fit 9 Algorithm Library Gamma M peak fit 10 Selection Of iii ea 9 Sum Non linear LSQ peak fit 9 Area parame
4. 8 Window settings 0 11 Zoom command oo 6 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 software 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
5. Model 506 Interactive Peak Fit User s Manual 9230873D V1 2 ISO 9001 SYSTEM CERTIFIED Copyright 2002 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 Interactive Peak Fit 0 02 ee ee ee ee ee ee ee ee 1 Staring IPE sures alogene Oe Eh ee BAG es BER ew we a 1 Pullers ae Seis te aaa Bae BV oe Oe ee 1 Plot Scaling use gi ae we ld as a ek Be 3 SNOW ROIS ai fe n oa pet ae ee 3 Libr
6. ary arranca a a e Bee a he 4 Usine APE eai gee cote ey we e A eee ae a A a ee a 4 Changing the Filter Settings ee ee 5 Markets 422g ae eee Pewee heehee Ree eee Ree eee DS 5 Previous and NexXt secer ere e lil a wr cal ae a a ee ee We aa En 5 Zoom and Unzoom s LL 6 Peak Edie eco See bbw A AT ie I e 6 Recalculate palio to o e dA ne a 6 Undre i ced eR DER ORE ER REDE EDEE SE Re EEE Ree YO 6 Adda Ped suecia Se pom a GR oe wi hel dc Sh ge aah Boba 6 Delete Peak sco ede ane EE Mek ASP GAS PE SEER ESO AA 6 S t Region Limitss ii fhe he HERE E OE RO REE SS a De ee 7 PUG gh es Cine te es RE Renn 9 Filter ge op og ea ed ace eH OEE a a doops See oe a eS he A ae BS 12 REPort sa choke rta Fee de Pode ee ag anton ei a Motes aes 12 PIO cine gf eee A oS es 13 Set Bkgnd Chns ii ss eonte eee HOR EOE wR EOD SES e ewe he EH 13 Batch Procedure Command LL 13 Notes Interactive Peak Fit The Interactive Peak Fit IPF option lets you examine the peak analysis results in cluded in the current datasource to see whether individual peak areas are multiplet peaks real peaks which have not been found to be statistically significant found peaks which are not relevant to your needs and so forth To illustrate the capabilities of IPF a sample CAM file CERNIPF CNF is included with the IPF software distribution IPF also lets you interactively affect the calculation of individual peak areas by edit ing adding and deleting peaks and peak
7. 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 software 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
8. continuum using the erosion technique as well as calculating the peak areas and their uncertainties Algorithm Selection The Algorithm Selection drop down list box lets you select a different Peak Fit algo rithm Peak Search Region You can limit the region by entering specific channel numbers in the Start and Stop text boxes 10 Peak Editing Library Fit Setup Peak Search Region Channeli Algorithm Selection Start fi End 4096 Library Gamma M Fit Window Settings Reject Factors Area 3 Variance Interference 4 Background Overlap 0 3 Nbr Bkgnd Terms Gain Correction Reject MDA MW Perform Gain Shift Sigma 25 Max Nbr Gain Passes 10 Constant Reject Gain Factor 0 0001 Cancel Help Figure 5 The Library Peak Fit Setup Window Settings The Area parameter specifies the FWHM multiplier used to establish the left and right ROI limits around the peaks which determine whether the peak is present in the spec trum The Interference parameter specifies the FWHM multiplier to establish the limit be yond which two adjacent peaks are no longer considered to interfere with each other The Overlap parameter specifies the FWHM multiplier which establishes the limit be low which two adjacent peaks are considered to be so close that no interference cor rection for area overlap is calculated Gain Correction The Perform Gain Shift parameter check box must be checked for th
9. e Step function should be chosen if there are any regions in the spectrum where the continuum is significantly higher on the left hand side of a peak region than on the right hand side This function automati cally reduces to a flat line if the continuum is flat Continuum Channels The Channels text box lets you select the number of continuum channels on either side of the current peak region 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 sin glet Fit Singlet Typically the Sum non linear LSQ Peak Fit routine is set up to fit multiplet peaks but if you check the Fit Singlet check box singlets will also be fitted rather than calcu lated using the summation method Fixed Parameters Selecting the Fixed FWHM Parameter or Fixed Tail Parameter check box causes the expected value FWHM or Tail or both 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 parameter will be allowed to vary Library Gamma M Peak Fit The Gamma M Library Peak Fit algorithm shown in Figure 5 includes steps for de fining the background
10. elete a peak Set Region Limits ad just the peak fit change the filter settings and display a report on or generate a plot of the current region Whenever you make any editing change press the Recalculate but ton to recalculate the peak areas and to update the peak region plot Recalculate Changing the region limits or adding or deleting a peak does not affect the peak re gion results so when the editing process is complete press the Recalculate button to recalculate the peak areas and to update the peak region plot If you try to exit IPF without refitting an edited peak you Il see a message asking if you want to ignore the edits Press Yes to discard the edits and exit IPF or No to remain in IPF Undo If editing a peak region leads to an unacceptable result the Undo button will discard all edits of the current peak region and will redisplay the original results of the current peak region Add a Peak To add a peak to the peak region place the data cursor at the approximate centroid channel of the new peak in either the peak region plot or the residuals plot then press the Add button The added peak is shown with its centroid marked by a blue ver tical bar Press the Recalculate button to recalculate the peak area with the new peak included and update the peak region plot Note that more than one peak may be added before recalculating the results Delete a Peak To delete a peak from the peak region place the data curs
11. ese two parame ters to be used in the calculations The Max Nbr Gain Passes parameter specifies the maximum number of iterations al lowed for the fits The Reject Gain Factor parameter specifies the convergence criterion When consecu tive iterations produce a change in the Chi square less than this value a convergence has been achieved 11 Interactive Peak Fit 12 Reject Factors The Variance parameter specifies the peak height variance rejection factor Only peaks whose height is larger than this factor times the uncertainty of the height at 1 sigma will be accepted as valid peaks The Background parameter specifies the peak rejection factor based on the height of the background Only peaks whose square of the height is larger than this factor times the height of the background will be accepted as valid peaks The Nbr Bkgnd Terms parameter defines whether the fits are to be made with an added constant or linear continuum 0 means that no additional continuum term will be used 1 means that only a constant continuum will be used and 2 means that a linear continuum will be used Reject MDA The Sigma parameter specifies the multiplier of the MDA equation to accept or reject a library peak in the spectrum The Constant parameter specifies the constant term of the MDA equation to accept or reject a library peak in the spectrum Filter If you find that more peaks are being displayed than you want to consider you can
12. et and its only peak was moved into the current peak region or was a multiplet and all of its peaks were moved to the current peak region IPF will move on to the next available peak region that satisfies the filter criteria If the adjacent peak region was originally a multiplet only some of its peaks are moved to the current peak region and the remaining peaks in the adjacent region satisfy the filter criteria the adjacent peak region will be presented as the next region if you move in that direction with the Next or Prev buttons Extending either of the current region s limits so that it overlaps but does not completely include another region creates a violated region Pressing the Next or Previous button when a violated region is being displayed brings up an error message telling you that a violated region exists Answering No to the message leaves the violated region on display answering Yes will display the next or previous region Peak Editing If you try to exit IPF with an OK before you have corrected the violations youll see a message telling you that you can t save this datasource because of the violated regions You ll have to either go to each violated region Yes to correct the violation or exit without saving the changes No Fit Press the Fit button to use the current Peak Fit algorithm to adjust the fit settings for the current peak region After making a change in the fit settings press the Recalc
13. hi square If you choose the Chi square filter and enter a value in its text box IPF will show all peak regions with a reduced Chi square greater than that value 2 The energy peak match tolerance is set in the Spectroscopy Analysis application through its Calibrate Setup dialog box Starting IPF FW Ratio If you choose the FW Ratio filter and enter a value in its text box IPF will show all peak regions with a measured to expected FWHM ratio greater than the given value Multiplets If you choose the Multiplets filter IPF will show only peak regions containing a multiplet Plot Scaling The Plot Scaling drop down list box lets you choose Linear Square Root or Log scal ing for the peak region upper plot display as seen in Figure 2 The residuals lower plot which indicates the goodness of fit is always displayed as a linear plot Both plots automatically select the appropriate vertical scale Interactive Peak Fit C GENIE2K CAMFILES Cernipf cnf Dj x Cursor 960 553 ke Region Start 960 553 keV Region End 972 371 keV Peak Edit 15000 lo T Add Delete 14000 Set Region Limits Set Bkgnd Ehns Recalculate IVA SN LAE Unzoom oo o p OSA DA Aad annda Setu Fit Filter Plot Report Unda Prev Next Markers OK Cancel Help Figure 2 Peak Fitting Window Show ROIs If you select the Show matching ROIs check box and there is the Acquisition and Analy
14. indicate a region of interest When the markers have been moved to the region of interest in the spectral window press IPF s Markers button If the markers match the boundaries of an analysis ROI in the datasource IPF will accept the fit of the current peak region and will change the display to the markers region as a calculated peak region with the known peak loca tions and fits If the markers do not match the boundaries of any existing analysis ROIs the data in side the markers will automatically be selected as a new peak region and will be dis played in the IPF window as data points To add a peak to this region place the IPF cursor on the peak channel press Add then press Recalculate to recalculate the peak area and update the peak region plot Previous and Next These two controls accept the fit of the displayed peak region and move to the next lower energy Prev button or next higher energy Next peak region that satisfies the filter criteria Interactive Peak Fit Zoom and Unzoom To look at a peak in more detail press the Zoom button to decrease the peak region plot by five channels on each side of the peak region To look at more of the datasource press the Unzoom button to increase the peak region plot by five channels on each side of the peak region Either button can be pressed several times to increase or decrease the number of channels displayed Peak Editing The Peak Edit tools let you Undo an edit Add or D
15. mber of continuum channels will remain un changed If the modification of the peak region limits now includes a peak or peaks that origi nally were part of an adjacent peak region they will become part of the new region If an adjacent peak that has now become part of the current peak region was originally a singlet its original results will be erased when you press the Recalculate button If the adjacent peak that has been moved to the current peak region was originally part of a multiplet its original results will be erased when you press the Recalculate button However the results for other peaks in the multiplet that were not moved to the cur rent peak region will remain unchanged The original peak region limits of the adja cent region will remain the same even if they overlap the current peak region If all peaks in an adjacent peak region are moved into the current one all of its original re sults including peak region limits will be erased when you press the Recalculate but ton 3 The energy calibration tolerance is set in the Spectroscopy Analysis application through the Calibrate Setup dialog box Interactive Peak Fit AS ab 30 ga Figure 3 A Typical Peak With Region Markers If the adjacent peak region satisfies the filter criteria and would be looked at next af ter the results of the current peak region have been accepted the following rules ap ply If the adjacent peak region was originally a singl
16. or at its approximate cen troid channel then press Delete IPF will use the peak match energy tolerance to look for a peak location around the current location of the data cursor Peak Editing If a matching peak location is found you ll see a message describing the peak and ask ing if you want to delete it If you are satisfied that this is the correct peak press Yes to delete it The deleted peak will be marked with a red vertical bar at its centroid If this is not the peak you want to delete press No move the cursor to the correct peak then press De lete again IPF will beep if it doesn t find a peak within the energy calibration tolerance of the data cursor location If there is more than one peak within the energy tolerance of the data cursor location IPF will use the peak closest to the cursor Set Region Limits To modify the peak region s limits move the limit markers to new locations then press the Set Region Limits button the markers are moved in the same way as in the Spectroscopy Analysis application s spectral window Figure 3 shows a typical peak with the mouse cursor next to the left region marker changed to a double line with an arrow This is the tool used to drag the marker to a new location When peak region limits are changed the continuum channels will automatically be moved to be in the same locations relative to the new region limits as they were with respect to the old region limits the nu
17. parameter 12 Next buttod o o 5 Nuclide Filter s agognata e at 2 Library se 64 5 2a aw dre ed ee 4 O Overlap parameter o o 11 15 P Peak Addng a A 6 Deleting as ccc eek we ee Ge eS 6 Editing tools 2 5 4 bs a a cores 6 Falters cx hai PRE ees ew 1 5 12 Peak fit algorithm LIDrary aves wa ca Se ais kok we Boe oS 10 Sum Non linear LSQ 9 Peak searchregion 10 Plot scale sno AGES a he Bh Ae aS 3 Plotting the current peak 13 Previous button 04 5 R Recalculate button 6 Region Setting the limits Of 7 Violated definition Of 8 Reject Gain factor s 11 MDA or bale 12 NE sos sed Ew Mw ne dea eh 12 Report Command LL 12 Plot docs os ed da te Bs Be GA 13 ROIS SHOW o dieta Bak GH wee Ge eters 3 16 scaling plot se 4 o eve oo pled bees 4 3 Search TEGION i ea we a ee di 10 Selecting the fit algorithm 9 Set bkgnd chns function 13 Show ROIs command 3 Sigma parameter 0 12 Square root plot scale 3 Starting PFIt o ocio 1 Step background command 10 Sum Non linear LSQ fit setup 9 Undocommand 6 Unzoom command 6 Using IP i ici pae e ep aa a 4 Variance parameter 12 Violated region definitionof
18. quares e Uses a vertical red line to mark the centroid of a deleted peak e Uses a vertical blue line to mark the centroid of an added peak The display includes the current peak region upper plot and the residuals lower plot which indicates the goodness of fit for the displayed peak region The data points in the residuals plot are the normalized differences between the data and the fit A perfect fit would result in the points being displayed in a straight line with a value of Zero Using IPF If the datasource contains no peak regions that match the current filter settings you Il see an error message telling you so acknowledge the error message to bring up an empty plot For IPF to show peaks you ll have to either e Change the filter settings described in Changing the Filter Settings on page 5 e Or use peak regions you choose from a datasource in a Spectroscopy Analysis application s spectral window using the Markers command described in Markers on page 5 Changing the Filter Settings To change the filter settings press the Filter button select different filters and exit the dialog box with an OK Though no change will be seen in the currently displayed re gion pressing either Next or Prev will make the new filter settings take effect Markers Regardless of IPF s filter settings you can select a region to view by using the mark ers in the Spectroscopy Analysis application s spectral window to
19. regions of a datasource which has been cali brated for energy and shape If the peak analysis results are not included in the current datasource IPF can act on peak regions from a datasource in the Spectroscopy Analy sis application s spectral window that you select with markers IPF is accessible in two ways through the Manual Menu in the Spectroscopy Analysis program and as a Batch Procedure Command IPF can be run as a peak region editor in both modes and in the batch command mode as a peak region viewer which can t edit the peaks Starting IPF To run IPF analysis on the current datasource select Interactive Peak Fit from the Spectroscopy Analysis application s Manual menu This will bring up IPF s Filter Setup window Figure 1 where you can select the Peak Filters to limit the number of peaks that IPF will display Note that a similar dialog box allows you to change these parameters from within the IPF Peak Fitting window Press Execute to start IPF using the selected filters and parameters or press OK to save the parameters without running IPF Filters You can use one or more of the Chi square FW Ratio and Multiplets filters together to limit the number of peak regions to be shown but three of the filter selections No Fil ters Energy and Nuclide are mutually exclusive you can t use any other filter with them When IPF is executed it will present the first lowest energy region which matches the current filter
20. settings 1 The IPFIT batch command is described in the Batch Procedure Reference chapter of the Model S561 Batch Tools Support Reference Manual Interactive Peak Fit 1 Filter Setup Peak Region Filters Plot Scalina MV No Filters fna M T Energy fo keV T Nuclide TT Show matching ROIs in MCA View TT Chi square 0 I FW Ratio fo Library I Multiplets STDLIB X Cancel Help Execute Figure 1 Filter Setup Screen No Filters If you choose No Filters IPF will show all peak regions in the datasource Energy If you choose the Energy filter and enter the energy of interest in its text box IPF will show all peak regions that have at least one channel within the current datasource s en ergy peak match tolerance of the energy you enter here The entire region is pre sented as the peak region plot If there is no peak region at that energy a peak region equal to six FWHM centered around the specified energy will be established and shown as the peak region plot Nuclide To look for a specific nuclide choose the Nuclide filter and enter the nuclide s name in its text box IPF will look in the current library for that nuclide then will show the peak region that matches the nuclide s lowest energy The nuclide s higher energy peaks if any can be seen by pressing the Next button For each of the peaks the entire region that includes the peak is presented as the peak region plot C
21. sis application containing the same datasource the ROIs that match IPF s filter settings will be shown in the application s spectral window when you press the Exe cute button Any changes that you make to the ROIs will be seen in the spectral win dow according to the current filter settings after you exit IPF with an OK Interactive Peak Fit Library The nuclide name you specified for the Nuclide filter will be searched for in the nu clide library specified here Using IPF When you press the Execute button IPF will look for peak regions in the current datasource using the filters you selected then display all of the peak regions it finds starting with the region with the lowest energy The typical IPF window in Figure 2 shows the name of the currently selected datasource on the title bar The window s Status Line below the title bar shows the location of the data cursor and the start and end of the current peak region Display Colors To show specific information about the current region IPF e Indicates normal channels with green squares e Indicates continuum channels with white squares e Shows error bars on the squares if the display scale allows e Denotes the 2 sigma lines in the residuals display with parallel red lines e Differentiates peaks with a variety of colors and patterns e Shows the continuum background as a solid magenta area e Marks channels belonging to another region a violated region with blue s
22. ter o 11 B Background parameter 12 Cc Channels command 10 Chi square filter 2 ee a h e aa 2 Constant parameter es sperantes 12 Continuum Channels changing the 10 Command sioni e vie wires di 10 D Deleting peak gt una be ee ay Gs 6 Discarding edits ca 4 es mr a 6 E Editing peaks ssc c 4450865444445 5 6 Edits discarding 4 6 Energy filtet s aos na ee aes Be Bs 2 F Filters Chi SQuare 2 A A o ae 2 FW Tating gcas euena ie e 3 Multiplets 3 NO psa a league e ne 2 Nuclide s as ei pupae ee a 2 Setting the s cread het re Ea 1 5 12 Fit Algorithm selecting 9 Command ii ius pali ses Bode os 9 Fit singlet peak area 2 aaa 10 Fixed parameters peak area 10 FW ratio filter oia naa e ee Gs 3 G Gain COreChON ss Lg ea e 11 Generating areport 0 12 l Interference parameter 11 IPFit Starting s 25 22 4 Lai ee arse eS 1 USNS e rene pe 4 L Library Gamma M peak fitsetup 10 Nuclide selecting 4 Limits setting for a region 7 Linear Background command 10 Plotscales 1 4 24 6456 44 88 3 2 be 3 Logplot scale e xo cced ee ee 3 M Markers command 5 Max nbr gain passes parameter 11 Modify region limits 7 Multiplets filter 3 N Nbr bkgnd terms
23. ulate button to recalculate the current region s peak areas and to update the peak region plot Sum Non Linear LSQ Peak Fit The Sum non linear LSQ Peak Fit algorithm setup shown in Figure 4 lets you select a different peak fit algorithm change the method of calculating the current region s con tinuum and select the number of continuum channels to be used in the fit calculation Sum Non Linear LSQ Fit Setup x Continuum Algorithm Selection Type Ste Sum Non Linear LSO Fit y Channels I Fit singlet IM Use fred RWHH IV Use fivedilow tail Cancel Help Figure 4 The Sum Non Linear LSQ Peak Fit Setup The Area Non Linear LSQ Peak Fit algorithm calculates the peak areas of single peaks using the summation method described in Peak Area for Single Peaks in the Algo rithms chapter of the Genie 2000 Customization Tools Manual and the peak areas of multiplets using a fitting method as described in Peak Area for Multiplets in the same document Algorithm Selection The Algorithm Selection drop down list box lets you select a different Peak Fit algo rithm Interactive Peak Fit Continuum Type You can calculate the continuum under the peaks in one of two ways with a Step function or a Linear function The Linear function estimates the continuum under the peaks as a trapezoid and is a simple straightforward equation that is adequate when the continuum in the spectrum is relatively flat Th
Download Pdf Manuals
Related Search