S508 MGA for Genie-2000 User`s Manual
Contents
1. Toensure that the analysis algorithms work correctly when MGA is analyzing the low energy plutonium spectrum the 59 keV and 208 keV peaks emitted by all plutonium samples should be present If the 59 keV peak is missing the program automatically attempts to find a 129 keV line to use in the calculations If the 129 keV and 208 keV lines are not found do not exceed the uncertainty threshold the low energy spectrum cannot be analyzed If the marker peaks of the low energy spectrum are not found and the program is operated in a two detector mode no analysis results are produced for either spectrum When MGA is analyzing the high energy plutonium spectrum the 208 keV and 414 keV peaks emitted by all plutonium samples must both be present If either line is missing does not exceed its uncertainty threshold the high energy spectrum cannot be analyzed In the single high energy only mode no results will be produced at all In the two detector mode MGA analyzes only the low energy spectrum and exits with an error code indicating that the high energy spectrum could not be analyzed because the key line was missing Operation The MGA program for Genie 2000 requires that the Model S500 Model 502 or Model 504 Genie 2000 Basic Spectroscopy software be already installed on your computer The MGA application is designed to analyze only 4096 channel spectra when operating in the two detector mode both spectra must be 4K In the singl2. 2304 17617 0 70 18653 0 70 Pu 239 1 000000 0 4927 63 78246 0 54 63 49528 0 54 Pu 240 0 412789 0 E 1568 26 32873 0 74 26 21359 0 73 Pu 241 0 080047 0 Pu 242 New alg Am 241 0 051113 0 60706 10 59065 10 1 3 E b 0000 5 10559 0 66 51396 0 67 3 3 26013 0 66 821868 0 79 Pu 240 effective meas date 35 353 1 87 Am 241 separated about 10 227 t 0 068 years ago Am Pu 241 weight ratio 0 63854 0 19 II Figure 2 Typical MGA Output Report D MGA Error Messages The MGA program may set several warning flags in the datasource The following mes sages corresponding with MGAERROI up to MGAERR31 may be listed in the report 01 Count rate exceeds x cps The low energy spectrum count rate is higher than x cps x equals CAM parameter MGAERRB multiplied with 20000 02 Low energy spectrum gt 4K high energy spectrum ignored When the low energy spectrum exceeds 4K the high energy spectrum will not be considered 03 Bad system gain zero establish better scaling The positions of one or more peaks are quite different from the positions calculated using the zero gain values based on the energy calibration Either the analyzer zero gain should be adjusted or the spectrum should be recalibrated 04 Efficiency curvature was fixed due to low peak areas The efficiency curvature is not allowed to be a free parameter when the peak intensities are too weak Solution G
3. peak search and nuclide identification results MGA does not overwrite them However any previous MGA results are automatically overwritten without warning This version of MGA supports only the file formats supported by the basic Genie spectroscopy program No graphic output of the fits to the screen is supported Interactive Use of MGA MGA predicts FWHM at a given energy using the equation FWHM VA B E where E is the energy in keV and A and B are calibration parameters By default initial shape calibration parameters for the first low energy detector are determined using the equation A 0 03 0 008 detector volume 0 00017 0 000018 detector volume For large volume detectors this default calibration may not be very accurate and may lead to improper functioning of MGA If the environment variable MGA_USEGENIEFWHM is defined the Genie 2000 FWHM calibration parameters will be used as the initial calibration taking into account the differences in the forms of the MGA and Genie 2000 shape calibration equations The easiest way of defining the environment variable is to use REGEDIT to create the value in HKEY_LOCAL_MACHINE SOFTWARE Canberra Industries Inc Genie 2000 Environment Note that MGA will recompute the low energy detector shape calibration parameters if there are adequate statistics in the 59 129 and 148 keV peaks For a high energy detector MGA uses the values 0 4 and 0 00195 for A and B respectiv
4. Abs Thickness to assist the calculations Interactive Use of MGA The Pu 242 calculation method can be selected to be either declared known old or new If the Pu 242 calculation method is selected to be declared the appropriate value must be entered in the entry box labeled Declared Pu 242 Abund The old and new Pu 242 calculation methods perform the Pu 242 calculations as explained in MGA A Gamma Ray Spectrum Analysis Code for Determining Plutonium Abundances referenced on page 1 When the New Pu 242 calculation method has been selected you may also enter your own Pu 242 calculation coefficients by pressing the Coef button These user specified Pu 242 coefficients are used in the following equations to calculate the Pu 242 abundance There are two forms of the calculation ratio and abundance The code will automatically detect which form is being used even if only coefficients C1 C5 are non zero The ratio form is given by 242 239 238 239 240 239 241 Am 239 C5 238 239 C6 240 239 C7 241 Am 239 00 where the quantities in brackets are the weight percentages The abundance form is given by Pu 242 238 sum C2 239 sum 240 sum 241 Amysum C where sum 0 01 238 239 240 241 Am Use of the check boxes labeled Freshly Separated Am 241 Use 38 59 keV Region in Analysis and Uranium Present in Sample is optional In nearl
5. Most error messages are handled by the report template because their positions in the error array are fixed Record Parameters VARNAME RELABN DRELABN DRELABNR WGTPCTM Isotope name e g Pu 238 Am 241 etc Relative abundance to Pu 239 Percent error in relative abundance to Pu 239 Percent error in relative abundance ratio Weight percent at measurement time DWGTPCTM WGTPCTD DWGTPCTD SPECPWR 241RELABN 241DRELABN 241DRELABNR VCVM1 VCVM16 MGA Output Parameters Percent error in weight at measurement time Weight percent at declaration time Percent error in weight at declaration time Specific power mW g Relative abundance to Pu 241 Percent error in relative abundance to Pu 241 Percent error in relative abundance ratio Covariance matrix for the abundance uncertainties 2n 1 where n is the number of isotopes The SOLUTION analysis type is disabled C MGA Report Output Example Displaying File CBNM61L RPT Report generated on 2 06 96 0 40 43 AM HGA version MGA V9 5 CI Spectrum 10 CBMMBIL CNF Sens 30 0 LT 38 9 Mins DT 44 62 Measurement date 9 08 92 Declared date 1 01 91 Sample ID SVVP compare 2 Detector Total counts 7 492E 07 Pu g cm 3 3628 Cd g cm2 1 1789 FWHM at 122 keV 528 eV FIT 1 69 FWHH at 208 keV 657 eV NOFIT 1 01 Isotope analysis at Isotope Relative Xx Relative Xx Meas date Decl date to 239 to Pu 241 Err X weight Err weight xErr Pu 238 0 018440 0
6. criterion maximum percent uncertainty allowed in either mode This qualifier uses the parameter PRMGALEDETLM If this qualifier is omitted the value in the file is used For files where the MGA parameters have not been initialized a default value of 30 is used HEDETLIM lt value gt Specifies the high energy spectrum detection limit criterion maximum percent uncertainty allowed in the two detector mode This qualifier uses the parameter PRMGAHEDETLM If this qualifier is omitted the value in the file is used For files where the MGA parameters have not been initialized a default value of 10 is used HEONLY Specifies that the current spectrum is a high energy spectrum If this qualifier is not specified the current spectrum must be low energy HELP Displays help text for this command PRMGAANALTYP ECSLOPE ECOFFSET Note PRMGAAMHETRO PRMGAFIXPB MGAFCDABS PRMGAFIXCD MGAFPUABS PRMGAFIXPU PRMGANSPEC NDETHIPBTHK NDETHICDTHK NDETCDCF ACQDETVOL NSPRMGASTEEL ACQDETDEPTH NEFFMGAHFRAC A MGA Input Parameters The following parameters from the CAM file control the execution of the program Type of analysis 8 characters always set to STD Gain of the spectrum should be around 0 075 for the low energy spectrum Energy of the zero channel of the spectrum energy offset The high energy spectrum has its own slope and offset Am 241 is heterogeneous 1 heterogeneous O homogeneous This pa
7. 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 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 n
8. 0 Volume 1 Methods and Algorithms Livermore California Lawrence Livermore Nation Laboratory 2 Installation To install MGA on your computer open a DOS Prompt window put the installation disk in the floppy drive and type x setup where x is the drive designator Alternatively launch Windows Explorer navigate to the floppy drive then double click on SETUP EXE 3 Operation MGA analysis can be performed interactively via the Genie 2000 Gamma Acquisition and Analysis program or in batch mode via the MGA batch command The interactive mode of operation is described on page 5 and the batch mode operation on page 9 When using MGA interactively an MGA report can be generated automatically if the Generate Report checkbox described on page 8 is checked In batch mode the report is generated via the REPORT command using template file MGA TPL report section MGA The REPORT command is described in the Batch Pro cedure Reference chapter in the Model S561 Batch Tools Support Reference Manual For example to print an MGA report for the file MGADATA CNF a typical batch com mand would look like this REPORT MGADATA CNF TEMPLATE MGA TPL SECTION MGA NEWFILE FIRSTPG PRINT Notes and Restrictions e If the datasource s have not been initialized for MGA parameters the defaults shown in Appendix A MGA Input Parameters are assumed Otherwise the parameter values in the datasources are used
9. CAM write operation x Error when dumping one or more CAM parameters into the low energy datasource The value of x stands for the next storage phase 1 reset of MGA results flag MGAFLAGS 2 variable type CAM parameters MGAVERSION up to MGAPU242TYP of above output list 3 variable floating point CAM parameters part 1 PUTHICK up to MGATOTCOUNTS of above output list 4 variable floating point CAM parameters part 2 PUXRFINT up to MGATOTSPOW of above output list 5 9 Pu xxx analysis results a Am 241 analysis results b Np 237 analysis results c Am 243 Np 239 analysis results d U 235 analysis results 21 MGA Error Messages e U 238 analysis results f flag CAM parameters MGA235REC up to MGATYPE of the output list above 10 fission isotope concentrations with errors MGAZR95CONC up to MGACE144CERR of above list 11 solution analysis results not stored yet 12 MGA error message arguments MGAERRA up to MGAERRF of the above output list 13 storage of MGAFLAGS MGADONE set to 1 and MGAERRxx flags 123 Error during CAM read operation x Error when reading one or more CAM parameter from the low or high energy datasource The value of x stands for the next input phase a low energy datasource sample information CAM parameters CHANNELS up to ECOFFSET of above input list b spectral data of low energy datasource 14 high energy datasource sample information CAM parameters CHANNELS up to ECO
10. FFSET of above input list 15 spectral data of high energy datasource 196 Unable to allocate memory x x represents the program phase where a memory problem occurred 1 spectral data 2 low energy datasource MGA analysis information 3 high energy datasource MGA analysis information 4 MGA analysis results 5 MGAPC info message data 197 Number of channels too high x x is 1 for the low energy datasource and 2 for the high energy datasource 198 Invalid parameter value in MGA SETUP x x stands for the following situations 0 problem during scanf operation on the string of the environmental parameter MGA SETUP y the value on place y in the MGA SETUP string is out of range Error message 198 will not occur because the environmental parameter is no longer used 199 Conflicting declaration and acquisition date 0 Illegal order of the declaration and acquisition date 200 MGA solution analysis disabled 0 MGA solution analysis type cannot be selected 201 Error during access of temporary parameter file x A file access error the temporary file MGAINFO TMP occurs during the next operation represented by x 1 file opening error during info dump by MGA 2 file write error during the dump of low energy datasource analysis informa tion 3 file write error during the dump of high energy datasource analysis informa tion 4 file write error during dump of spectral d
11. MGACAL by x The efficiency curve in the 125 148 keV region is further evaluated when the sample contains a significant amount of Am 241 A significant change in excess of 1 is reported as warning that the different methods of determining the efficiency slope in this region do not exactly agree The reason for disagreement should be studied x equals CAM parameter MGAERRD 19 FWHM of the low energy detector gt 700 eV MGA noticed resolution problems for the low energy spectrum The results might be improved with the use of a detector with better resolution 20 High FWHM 2 vs energy slope gt x radiation damage MGA had problems to derive the FWHM equation x equals CAM parameter MGAERRA 21 FWHM of the low energy detector gt 700 eV MGA noticed resolution problems for the low energy spectrum The results might be improved with the use of a detector with better resolution MGA Error Messages 22 Poor quality of fit results may be suspect The NQFIT figure of merit exceeds 1 02 The results may still be good but if the magnitude of NQFIT is significantly high the residuals should be examined The following messages refer to messages coming from the higher energy part of the gamma ray spectrum which is only analyzed in the 8K and two detector modes 23 Coax detector spectrum not at 25 keV channel Problems with the energy calibration of the high energy spectrum It is advised to adjust ga
12. Model 508 MGA for Genie 2000 User s Manual V9 63C 9230993 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 Table of Contents T IBUOQUGTO usum be ve eH ce a Ge Ga 1 2 Installation sos ss eee eRe HR REDE SRO EO REOR eom o 2 EC 3 Notes and Restrictioms sc 5 nos woe Gass deo da E Bee Goal ew KE Rex 3 Interactive Use of MGA 5 Bat
13. ata 5 file close error during info dump by MGA 6 file opening error during analysis results read by MGA 7 error during analysis results read by MGA 8 file close error during analysis results read by MGA 202 Invalid acquisition sampling date x x corresponds with the following dates 1 low energy datasource sampling date and time 2 low energy datasource acquisition date and time 3 high energy datasource sampling date and time 4 high energy datasource acquisition date and time 203 Improper functioning of MGAPC program x A problem occurred during the execution of the MGAPC program x reflects the following situations 1 c4 a program spawning error occurred for more information see DosExecPgm return values in the CP reference c8 temporary file access error when MGAPC tried to read the stored informa tion c9 MGAPC did not store any analysis results in the temporary file ca MGAPC did not get any acquisition date and time information 23 24 MGA Error Messages cb MGAPC did not receive a live time cc MGAPC returned an illegal value for one of the error and warning flags 204 129 or 208 keV peak too small in low energy spectrum MGAPC could not find one of the indicated calibration peaks The parameter x represents the following situations 1 208 keV peak not found 2 129 keV peak not found 205 Number of counts in low energy spectrum too low 0 The low energy datasource d
14. ch Use of MGA amp doh re See P UE e Saw Rede STA geo e e D ES 9 A MGA Input Parameters 11 MGA Output Parameters 13 Common Parameters 2e bos borse Rede E dem 9o 30d edes enum bos X ous 13 Record Parameters le eee es 15 C MGA Report Output Example 17 D MGA Error lt 18 Notes 1 Introduction This document describes how to install and operate Multigroup Analysis MGA applica tion in the Genie 2000 environment One other document by the author of this software is available from Canberra on request The MGA application analyzes the Ge spectra of plutonium samples and reports the rela tive abundances of the plutonium isotopes and other actinides in the sample Normal gamma spectroscopy analysis requires a spectrum to be energy and efficiency calibrated before analysis and sequentially calls several analysis engines to perform the analysis MGA only requires that the spectra be energy calibrated and it performs its entire analy sis in one step The MGA application has three operating modes single low energy detector mode sin gle high energy detector mode and two detector mode where two detectors measure sep arate spectrums of the same sample 1 Gunnink R 1990 MGA A Gamma Ray Spectrum Analysis Code for Determining Plutonium Abundances Report UCRL LR 10322
15. d Old Igore fatal errors Men Declared Pu 242 Abund 0 LE Detector Volume 0 LE Spectrum Detection Limit 0 Steel Container Thickness mm 0 HE Spectrum Detection Limit HE Detector Height mm High Energy File Select HE Detector Width mm 0 Generate Report Cancel Help Execute Figure 1 MGA Analysis Setup Dialog When all of the parameters discussed on the following pages have been set press the Ex ecute button to start the analysis The Fix Cd Absorber Thickness check box may be checked to assist the calculations when the statistics are very poor Normally the Cd thickness is determined from the data However with poor statistics the program may have difficulties making that determination If the Cd absorber thickness is known enabling this option usually helps the calculations If the Fix Cd Absorber Thickness check box is checked the thickness must be entered in the Cd Abs Thickness entry field in mm Otherwise this entry field can be left at zero Forsituations when the plutonium material is not infinitely thick the calculations may have trouble determining the amount of self attenuation caused by the plutonium in the sample particularly if the spectrum statistics are poor Checking the check box labeled Fix Pu Absorber Thickness permits fixing the plutonium thickness to a known value to be entered in the entry box next to the label Pu
16. d 208 keV peaks The default value is 30 The spectrum limit allows the user to specify the high energy spectrum detection limit criteria maximum uncertainty percent in the 208 and 414 keV peaks The default value is 10 The LE detector volume entry is optional if no value is entered a default value of 5 is used For poor statistics and marginal resolution it often helps the calculations to enter the real detector value in cm The steel container thickness in mm can be entered if known This helps calculations when the statistics are poor and the program has problems converging on a solution Normally this value is determined directly from the data The HE detector height and width in mm can be used to assist the high energy spectrum analysis when the statistics are poor Normally the program determines the size of the high energy detector from the data directly Batch Use of MGA Batch Use of MGA The following syntax is used for the MGA batch command Command Syntax MGA lt low energy datasource gt lt high energy datasource gt Qualifiers The lt low energy datasource gt name is required Qualifiers ID lt description gt Specifies a sample identification text string Up to 16 characters in quotes are allowed for this parameter The information is stored in the datasource as the parameter SIDENT sample identification If this qualifier is omitted the existing spectrum id remains unchanged DECL lt
17. declaration date gt Specifies the declaration date to which the reported activities are decay corrected This qualifier uses the parameter STIME If this qualifier is omitted the acquisition start date time is written into the STIME parameter no decay correction The time syntax must be the same syntax currently defined for the operating system PU242 lt value gt Specifies the Pu 242 percent abundance in the sample on the declared date if a declared date is given with the DECL qualifier If this qualifier is used without the DECL qualifier the given Pu 242 percent abundance is assumed to be the abundance at the acquisition start time If this qualifier is omitted MGA estimates the Pu 242 percent abundance using the results from the other plutonium isotopes using the new algorithm If the qualifier is assigned a value of 1 the old Pu 242 calculation method is used The program sets a value for a flag parameter that indicates whether the Pu 242 percent abundance parameter is an entered value or a calculated value SEPTIME value Specifies the reactor discharge to chemical separation time in years This qualifier is only useful in connection with the old Pu 242 calculation method and is ignored if used without it If the PU242 1 qualifier is used without this qualifier the separation time defaults to five years LEDETLIM lt value gt Operation Specifies the low energy spectrum detection limit
18. e low energy detector mode the sole spectrum can be either 4K 8K or 16K only the lower 8K channels of a 16K spectrum are analyzed If the first spectrum is 8K or 16K and a second spectrum is also provided the program analyzes the first spectrum normally but exits with a return code indicating that the second spectrum was ignored The energy calibration gain setting in the single low energy detector mode using 4K spectra must be approximately 0 075 keV channel In the two detector mode the low energy spectrum gain setting must be approximately 0 075 keV channel and the high energy spectrum gain setting must be approximately 0 25 keV channel In the single high energy only mode using 4K spectra the gain setting must also be about 0 25 keV channel For both spectra slight deviations from the recommended gain settings will not adversely effect the mathematical algorithms However large deviations from the nominal values may cause unpredictable results For larger spectra 8K or 16K the Genie 2000 energy calibration is used e A telescope configuration where the low energy detector is inside the high energy detector for the two detector mode is not automatically detected However a setup parameter ACQDETDEPTH see Appendix A MGA Input Parameters to indicate a telescope configuration is provided Ifthe spectrum file datasource being analyzed contains previous analysis results from a general purpose Gamma Analysis and Acquisition
19. efficient for Pu 242 calculation 2nd coefficient for Pu 242 calculation 3rd coefficient for Pu 242 calculation 4th coefficient for Pu 242 calculation 5th coefficient for Pu 242 calculation 6th coefficient for Pu 242 calculation 7th coefficient for Pu 242 calculation 8th coefficient for Pu 242 calculation 9th coefficient for Pu 242 calculation Det label 2 character descriptor for reporting purposes only defaulted to blank Large detector diameter in cm Large detector height in cm Total spectrum counts required in the low energy spectrum for the analysis to proceed default 2 0E 4 Low energy spectrum 129 and 208 peak detection limit uncertainty default 30 Measurement uncertainties in percent for the 129 or 208 keV peaks must be less than this value for analysis to proceed High energy spectrum 208 and 414 peak detection limit 96 uncertainty default 10 Measurement uncertainties in percent for the 208 or 414 keV peaks must be less than this value for analysis to proceed Long report flag 0 1 or 2 For settings 1 and 2 it will write intermediate results into a file MGALONG TMP An already existing file will automatically be overwritten Default 0 The parameters below are set to the following constant values ACQMGAEFSL ACQMGAEFCV PRMGANOABORT MGA efficiency slope set to zero MGA efficiency curve set to zero Shaping time constant for first system set to 2 0 Shaping time consta
20. ely If the environment variable is defined the Genie FHWM calibration will be substituted for these values as well During the operation of MGA a temporary file MGAINFO TMP is created By default this file is created in the default directory In some cases this may be inconvenient when the default directory is the system root MGAINFO TMP will appear on the Windows desktop The environment variable MGA_TMPDIR can be used to explicitly specify the directory to be used the directory name must not include a trailing backslash for example D Temp is acceptable As described in the previous point the easiest way to define this variable is to use REGEDIT to place it in the Genie 2000 Environment Interactive Use of MGA MGA can be selected from the Analyze menu item in the Gamma Acquisition and Analy sis window To use MGA from within the Gamma Acquisition and Analysis window 1 Open a datasource Operation 2 Select Analyze from the Gamma Acquisition and Analysis menu bar to see the list of analysis phases 3 Select MGA from the MGA MGA menu item You ll see the setup screen in Figure 1 wi MGA Analysis Setup Fix Cd Absorber Thickness Freshly Seperated AM 241 Cd Abs Thickness 0 Use 38 58 keV Region in Analysis Fis Pu Absorber Thickness Uranium Present In Sample Heterogenous Sample Flag Pu Abs Thickness 0 HE Spectrum Only Pu 242 Calc Method Use High Energy File Declare
21. et more data 05 59 keV peak is weak use less cadmium absorber A Cd filter is usually used to attenuate the 59 keV peak A better analysis could be made of the current sample by reducing the filter thickness if possible 06 59 keV peak is intense use more cadmium absorber Not enough Cd absorber used If the count rate can be increased by better geometry less collimation etc then a better analysis could perhaps be made of the current sample by increasing the Cd filter thickness 07 U 237 Pu 241 nonequilibrium detected The peak intensities of U 237 and Pu 241 indicate that the two isotopes are not in an equilibrium decay rate 08 Lead x rays observed Np 237 results could be affected Pb shielding that is not properly covered with Cd will produce Pb x rays These x rays will compromise the Np 237 results when using a single 4K spectrum If an 8K or a second spectrum is used the Np 237 abundance is calculated from the 312 keV peak of Pa 233 09 Lead x rays observed Pb x ray peaks observed in low energy spectrum 10 High side tailing observed check pole zero or count rate The high sides of the 59 and 208 keV peaks are examined The message is given if a significant deviation from a Gaussian distribution is found The Pu 240 result is particularly sensitive to this condition 11 Error in GFIT routine probable weak peak in location x MGA had problems to fit a given region x represents t
22. he location of the weak peak causing the problem CAM parameter MGAERRC This condition is not usually serious but if it persists steps should be taken to investigate its cause 12 Calculations in MGAABS didn t converge results may be suspect One of more parameters in the iterative non linear least squares process in subroutine MGAABS did not converge properly Action was taken to force convergence The analysis results may have been compromised Check if the low energy detector volume specified in the file is approximately correct 13 Efficiency curvature boundary reached The change in curvature of the efficiency curve is greater than allowed Make sure the low energy detector volume specified in the file is approximately correct 14 Efficiency slope too shallow Problems with the efficiency calibration calculations 15 Efficiency curvature boundary reached Efficiency slope too shallow MGA problems with the efficiency calibration calculations 16 ADC exhibits significant odd even effect The weighted residuals of the odd and even numbered channels in the 100 keV region are summed and compared The above warning message is given if they are statistically different The value of QFIT will increase but the results may not be affected 17 Thorium x rays detected in spectrum MGA found Th x rays Very rare condition Reported for information only 18 Pu 241 Pu 239 efficiency changed in
23. in or zero settings The normal gain for a coaxial detector is approximately 0 25 keV channel 24 208 keV FWHM of coax det gt 1 2 keV coax spectrum not used Resolution problems for the high energy spectrum which is not used any more for further analysis Better results might be obtained with the help of a better resolution detector 25 208 keV resolution exceeds 1 6 keV coax spectrum not used Coax detector resolution is unacceptable Analysis will be based only on the low energy spectrum 26 208 keV peak too weak high energy spectrum not used The percent error of the 208 keV peak in the coax spectrum exceeded the allowable value given in the file Analysis will be based only on the low energy spectrum 27 414 keV peak too weak high energy spectrum not used due to a too weak 414 keV peak MGA could not derive a good resolution calibration for the high energy spectrum which is not used any more for further analysis 28 630 660 keV region too weak to use The net counts in the 630 660 keV region of the coax detector are too low This region will not be used in the analysis Therefore U 238 cannot determined 29 Low energy spectrum gain zero defaulted to 0 075 0 A bad gain or zero value is read from the low energy spectrum 30 High energy spectrum gain zero defaulted to 0 25 0 A bad gain or zero value is read from the high energy spectrum 31 x MGA parameter s defaulted star
24. is heterogeneous the percent Am 241 abundance relative to Pu 239 error is based on the 600 keV region analysis If Am 241 is homogenous set to zero If Am 241 is heterogeneous the percent difference between the Am 241 abundance relative to Pu 239 error is based on the 100 keV region analysis and the 600 keV region analysis If Am 241 is homogenous set to zero Related to the heterogeneous Am 241 calculation If Am 241 is homogenous defaults to zero Related to the heterogeneous Am 241 calculation If Am 241 is homogenous defaults to zero Zr95 concentration Bq g Error in Zr95 concentration percent Nb95 concentration Bq g Error in Nb95 concentration percent Record Parameters MGARU103CONC MGARUIO3CERR MGARU106CONC MGARU106CERR MGACS137CONC MGACS137CERR MGACE144CONC MGACE144CERR Ru103 concentration Bq g Error in Ru103 concentration percent Ru106 concentration Bq g Error in Ru106 concentration percent Cs137 concentration Bq g Error in Cs137 concentration percent Ce144 concentration Bq g Error in Ce144 concentration percent Note For all fission products a concentration error of 100 indicates that the concentration is a 3 sigma upper limit not an activity actually found MGAERROI MGAERR25 MGAERRA MGAERRJ Error number 1 occurred 1 did not occur 0 Error number 25 occurred 1 did not occur 0 Error amplification A float Error amplification J float Note
25. nt for second system set to 2 0 Always return success status except for I O errors B MGA Output Parameters The following MGA calculations results are stored in the CAM parameters parameter names are followed by descriptions Common Parameters MGAVERSION MGA version information 16 characters PUTHICK Thickness the plutonium sample in g cm CDTHICK Thickness of the Cadmium absorber g cm QFIT Regular goodness of fit NQFIT Intensity normalized goodness of fit FWHM122 FWHM at 122 keV in eV FWHM208 FWHM at 208 keV in eV AMSEPTIME Time since Am 241 separation seconds DAMSEPTIME Percent error of time since Am 241 separation USEPTIME Time since U 237 separation seconds AMTOPU241 Am Pu 241 weight ratio DAMTOPU241 Percent error in Am Pu 241 weight ratio UTOPU U Pu ratio from fluorescence x rays DUTOPU Percent error in U Pu ratio from fluorescence x rays PU240EFF Pu 240 effective DPU240EFF Percent error of Pu 240 effective TOTSPOW Total specific power mW g TOTCOUNTS Total number of counts in the low energy spectrum LEFILENAME Name of the low energy spectrum file stripped 32 characters HEFILENAME Name of the high energy spectrum file stripped 32 characters HELIVE Live time of the high energy spectrum stored into the low energy spectrum file for reporting purposes HEREAL Real time of the high energy spectrum stored into the low energy spectrum file for reporting purposes DTOTSPOW Uncertainty in
26. oes not contain enough counts bad spectrum 206 Matrix is singular x MGAPC detected a singular matrix in one of the following Fortran subroutines 0 in MGAABS 10 25 in MGACAL empty data entry number incremented by 9 110 115 in MGAEQS number of empty data entry incremented by 109 207 Negative result for Pu 239 Pu 240 or Pu 241 0 208 Insufficient counts in 100 keV region 0 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
27. ot 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 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
28. rameter is effective only in the two detector mode This parameter should be set to 1 if the Am 241 concentration is not homogeneously distributed within the sample Pb absorber thickness mm around sample to default to zero always Fixed cadmium absorber thickness in g cm Use fixed cadmium thickness Y N Fixed plutonium thickness in g cm Use fixed plutonium thickness Y N Number of spectra used 1 or 2 High energy detector Pb thickness in mm default 0 0 High energy detector Cd thickness in mm default 1 0 High energy detector Cd thickness in second gamma path in mm default 0 0 This value should normally be left at zero Non zero values only apply to very unusual configurations where two distinct paths exist between the source and the detector Approximate volume cm of small detector Steel sample container thickness mm 15 Ge det depth mm non zero value indicates a telescope configuration Fraction of sample in 2nd path This value should normally be zero Non zero values only apply to very unusual configurations where two distinct paths exist between the source and the detector NSPRMGA242C0 NSPRMGA242C1 NSPRMGA242C2 NSPRMGA242C3 NSPRMGA242C4 NSPRMGA242C5 NSPRMGA242C6 NSPRMGA242C7 NSPRMGA242C8 NSPRMGA242C9 DETNAME ACQDETDIAM ACQDETWIDTH MGATOTCOUNTS PRMGALEDETLM PRMGAHEDETLM MGALONGREP MGA Input Parameters Multiplier constant for Pu 242 calculation Ist co
29. ting from parameter y x CAM parameters are not initialized or have an illegal value stored in the low energy spectrum see also INITIALIZATION section The value y represents the first bad CAM parameter found according to the input list of the INPUT section starting from PRMGAFIXPB The MGA program may generate the following error messages at execution time 101 Input datasource not specified 0 The low energy datasource was not added on the command line 103 Invalid switch was specified 0 Illegal command line argument was detected 104 Duplicate switch was specified 0 Same qualifier was entered twice on the command line 106 Too many switches were specified 0 Too many switches were added on the command line 108 Invalid switch value specified x The program detected an illegal switch value x can have the next values 2 bad syntax of declaration date 3 Pu 242 declared value out of range or non floating point string entered 4 low energy spectrum detection limit value out of range or non floating point string entered 5 high energy spectrum detection limit value out of range or non floating point string entered 6 reactor discharge to chemical separation time value out of range or non floating point string entered 117 Error while opening specified input datasource x Error during opening of the low or high energy datasource x equals the type of SAD error 122 Error during
30. total specific power mW g MGAPU242TYP U235RECNO NP237RECNO U238RECNO AM243RECNO MGAFLAGS AM100ABN DAMIOO0ABN AM300ABN DAM300ABN AM600ABN DAM600ABN PCT 100600 AMSTDDEV AMBETA MGAZR95CONC MGAZR95CERR MGANB95CONC MGANB95CERR MGA Output Parameters Pu 242 calculation method Declared New Old The record number of the U 235 analysis results makes reporting easier The record number of the Np 237 analysis results for reporting The record number of the U 238 analysis results for reporting The record number of the AM 243 analysis results for reporting O no results 12MGA analysis done and results exist If Am 241 is heterogeneous the Am 241 abundance relative to Pu 239 is based on the 100 keV region analysis If Am 241 is homogenous set to zero If Am 241 is heterogeneous the percent Am 241 abundance relative to Pu 239 error is based on the 100 keV region analysis If Am 241 is homogenous set to zero If Am 241 is heterogeneous the Am 241 abundance relative to Pu 239 is based on the 300 keV region analysis If Am 241 is homogenous set to zero If Am 241 is heterogeneous the percent Am 241 abundance relative to Pu 239 error is based on the 300 keV region analysis If Am 241 is homogenous set to zero If Am 241 is heterogeneous the Am 241 abundance relative to Pu 239 is based on the 600 keV region analysis If Am 241 is homogenous set to zero If Am 241
31. y all situations the program detects these conditions automatically The Heterogeneous Sample Flag refers to how the Am 241 is distributed in the sample The Am 241 content can be approximated even for heterogeneous material distributions by using this check box in connection with a high energy file The HE Spectrum Only check box must be checked to analyze a spectrum in the single high energy only mode Checking this box will also force the Genie 200 energy calibration to be used rather than the default of 0 075 keV channel The Use High Energy File check box must be checked if a dual detector system is used When used the name of the high energy file with the entire path name Operation must be entered into the entry box labeled High Energy File Note that you may have a high energy file name in the entry box already It will not be used unless the check box is checked Note also that the high energy file name may be selected from a usual file open dialog by pressing the Select button The Ignore fatal MGA errors is intended to be used in connection with analysis sequences If checked an analysis sequence will continue with the next step in the sequence even if the MGA analysis ends in an error Check the Generate Report button to obtain the default report on the screen LE spectrum limit allows the user to specify the low energy spectrum detection limit criteria maximum uncertainty percent in the 129 an
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