S508 MGA for Genie-2000 User`s Manual
Contents
1. Figure 1 MGA Analysis Setup Dialog When all parameters discussed on the following pages have been set press the Execute 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 determina tion If the Cd absorber thickness is known enabling this option usually helps the calcula tions 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 Operation For situations 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 Abs Thickness to assist the calcula tions 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 calculat2. 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 at the declared time if a declared date was provided or else at the acquisition start time using the results from the other plutonium isotopes The Pu 242 percent abundance is written to its own variable name RELABN in the Pu 242 record The program also sets a value for a flag parameter which indicates whether the Pu 242 percent abundance parameter is an entered value or a calculated value If the qualifier is assigned a value of 1 the old Pu 242 calculation method is used SEPTIME lt value gt 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 Batch Use of MGA 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 Specifies the low energy spectrum detection limit 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
3. 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 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 signif
4. 6 32873 0 74 26 21359 0 73 0000 5 10559 0 68 51396 0 67 3 a 0 0 0 0 60706 10 59065 10 26013 0 68 2 82188 0 79 Pu 240 effective meas date 35 353 1 87 Am 241 separated about 10 227 7 0 068 years ago Am Pu 241 weight ratio 0 63854 7 0 19 LI 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 MGAERRO1 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 Get 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 o
5. Model S508 MGA for Genie 2000 User s Manual 9230993C 6 99 ISO 9001 SYSTEM CERTIFIED Copyright 1999 Canberra Industries All rights reserved Canberra Industries 800 Research Parkway Meriden CT 06450 Tel 203 238 2351 FAX 203 235 1347 http www canberra com This manual contains proprietary information no part of it may be reproduced or used in any form or by any means graphic elec tronic or mechanical including photocopying recording or infor mation storage and retrieval systems without the written permission of Canberra Industries The information in this manual describes the product as accurately as possible but is subject to change without notice Printed in the United States of America Table of Contents 1 Introduction 1 2 Installation 6s lt 2 2 6 ra ww aw eS 2 3 Operation 5 4 se pomos ee REE E eve om 3 RESTACUIONS e s s ae ote a ce a he Bere oe ee ad a e e 4 Interactive Use of MGA coso eh baw ERE Eeka k a RETR OR HR DS 4 Batch Use of MGA 0 0 0 0 0 000 a 8 A MGA Input Parameters 2 00208222 10 B MGA Output Parameters lt 13 Common Parameters e soset a See ses ae SW ew Ee ee Bw Boe eR a Boe ew bs 13 R cord Parametros ad e Se we Bh do GR WES ES 16 C MGA Report Output Example 17 D MGA Error Messages 18 1 Introduction This document describes
6. ON 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 CAM write operation x Error when dumping one or more CAM parameters into the low energy datasource The value of x stands for th
7. Y OR FITNESS FOR A PARTICULAR PURPOSE OR OTHERWISE SHALL APPLY INNO EVENT SHALL CANBERRA HAVE ANY LIABILITY FOR ANY SPECIAL 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 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 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 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 purchas
8. ance 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 Common Parameters AMSTDDEV AMBETA MGAZR9SCONC MGAZR9SCERR MGANB95CONC MGANB95CERR MGARU103CONC MGARU103CERR MGARU106CONC MGARU106CERR MGACS137CONC MGACS137CERR MGACE144CONC MGACE144CERR 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 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 MGAERRO1 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 MGA Output Parameters Note Most error messages are handled by the report template because their positions in the error array are fixed Record Parameter
9. arameters 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 AMTOPU 241 Am Pu 241 weight ratio DAMTOPU 241 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 HEREAL DTOTSPOW MGAPU242TYP U235RECNO NP237RECNO U238RECNO AM243RECNO MGAFLAGS AMI00ABN DAMI00ABN AM300ABN DAM300ABN AM600ABN DAM600ABN PCT 100600 MGA Output Parameters Live time of the high energy spectrum stored into the low energy spectrum file for reporting purposes Real time of the high energy spectrum stored into the low energy spectrum file for reporting pu
10. d refer to the Ge nie 2000 Customization Tools Chapter 3 Batch Procedure Reference No graphic out put of the fits to the screen is supported MGA is available as a batch command or as aGamma Analysis and Acquisition algo rithm On line help is available through the HELP qualifier help text information is provided in Batch Use of MGA on page 8 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 Interactive Use of MGA 1 Open a datasource 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 Youll see the setup screen in Figure 1 f MGA Analysis Setup Fix Cd Absorber Thickness I Freshly Seperated AM 241 Cdbs Thickness O M Use 39 59 keV Region in Analysis M Uranium Present In Sample F Fis Pu Absorber Thickness Pu Abs Thick 0 M Heterogenous Sample Flag rae aaa HE Spectrum Only Pur242 Calo Method M Use High Energy File C Declared Old M Igore fatal MGA errors CE nen Declared Pu 242 Abund 0 LE Detector Volume o LE Spectrum Detection Limit 0 Steel Container Thickness mm 0 HE Spectrum Detection Limit 0 HE Detector Height mm 0 High Energy File Select HE Detector Width mm 0 FO Generate Report Cancel Help Execute
11. 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 23 24 MGA Error Messages 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 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 x 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 does not contain enough counts bad spectrum 206 Matrix is singular x MGAPC detected a singular matrix in
12. e 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 21 22 MGA Error Messages b Np 237 analysis results c Am 243 Np 239 analysis results d U 235 analysis results e U 238 analysis results f flag CAM parameters MGA235REC up to MGATYPE of the output list above 10 fission isotope concentrations with errors MGAZR9S5CONC up to MGACE144CERR of above list 11 solution analysis results not stored yet 12 MGA error message arguments MGAERRA up to MGAERRE 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 ECOFFSET of above input list 15 spectral data of high energy datasource 196 Unable to allocate memory x x repr
13. esents 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 xJ A file access error on 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 data 5 file close error during info dump by MGA 6 file opening error during analysis results read by MGA 7 error
14. f 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 the 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
15. gram 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 must be ap proximately 0 075 keV channel In the two detector mode the low energy spectrum gain setting should equal the single spectrum in the single detector mode and the high energy spectrum gain setting must be approximately 0 25 keV channel In the single high energy only mode 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 mathemati cal algorithms However large deviations from the nominal values may cause unpredict able results A telescope configuration where the low energy detector is inside the high energy detec tor for the two detector mode is not automatically detected However a setup parameter ACQDETDEPTH see Appendix A MGA Input Parameters to indicate a telescope con figuration is provided If the spectrum file datasource being analyzed contains previous analysis results from a general purpose Gamma Analysis and Acquisition peak search and nuclide identification results MGA does not overwrite them However any previous MGA results are auto matically overwritten without warning This version of MGA supports only the CAM file format Any other formats must be converted to the CAM format with the FILECNVT batch comman
16. he 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 In batch mode and in the Interactive Mode run the general purpose report program after executing MGA to produce the desired report In the Interactive Mode you can also use the Generate Report check box to produce the desired report Appendix B MGA Out put Parameters shows the parameters written out as a result of an MGA analysis Appen dix C MGA Report Output Example shows an example of the MGA report format The REPORT program s standard syntax allows you to specify the report template file name and section where to direct the report and so on Refer to the Report Template Files in the Genie 2000 Customization Tools Manual for details Operation Restrictions The MGA program for Windows 95 NT requires that the Model S500 Model 502 or Model 504 Genie 2000 Basic Spectroscopy software be already installed on your com puter 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 single low energy detector mode the sole spectrum can be either 4K or 8K If the first spectrum is 8K and a second spectrum is also provided the pro
17. 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 103220 Volume 1 Methods and Algorithms Livermore California Lawrence Livermore Nation Laboratory 2 Installation To install MGA on your computer open a Windows 95 NT DOS Prompt window insert the installation disk into a floppy drive and type x setup where x is the drive designator 3 Operation When using the Gamma Acquisition and Analysis interactive mode the datasource to be analyzed is specified with the File Open datasource menu option When using the ba
18. icant 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 gain 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
19. ing 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 00
20. ion methods perform the Pu 242 calculations as ex plained in the MGA report 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 use the following equations to calculate the Pu 242 abundance The ratio form is given by 242 239 C1 238 239 240 239 241 Am 2391 C5 238 239 C6 240 239 C7 241 Am 239 1 where sum 0 01 238 239 240 241 Am where the quantities in brackets are the wt percentages and Pu 242 Pu239 x 242 239 The abundance form is given by Pu 242 C1 238 sum C2 239 sum 240 sum 241 Am sum S where sum 0 01 238 239 240 241 Am The code will automatically detect which form is being used even if only coefficients C1 C3 are non zero 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 nearly all situations the pro gram detects these conditions automatically Interactive Use of MGA 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 onl
21. nown 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 can be used to assist the high energy spectrum analysis when the statistics are poor Normally the program determines the size of the high en ergy detector from the data directly MGA Report To see the report choose Reporting from the list of Manual analysis phases then se lect the MGA TPL template and the MGA section Operation 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 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
22. oefficient 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 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 MGA efficiency slope set to zero ACQMGAEFCV PRMGANOABORT MGA Input Parameters MGA efficiency curve set to zero Shaping time constant for first system set to 2 0 Shaping time constant 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 p
23. 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 l A CANBERRA Warranty Canberra s product warranty covers hardware and software shipped to customers within the United States For hardware and software shipped outside the United States a similar warranty is provided by Canberra s local representative DOMESTIC WARRANTY Canberra we us our warrants to the customer you your that equipment manufactured by us shall be free from defects in materials and workmanship under normal use for a period of one 1 year from the date of shipment We warrant proper operation of our software only when used with software and hardware supplied by us and warrant that our software media shall be free from defects for a period of 90 days from the date of shipment If defects are discovered within 90 days of receipt of an order we will pay for shipping costs incurred in connection with the return of the equipment If defects are discovered after the first 90 days all shipping insurance and other costs shall be borne by you LIMITATIONS EXCEPT AS SET FORTH HEREIN NO OTHER WARRANTIES WHETHER STATUTORY WRITTEN ORAL EXPRESSED IMPLIED INCLUDING WITHOUT LIMITATION THE WARRANTIES OF MERCHANTABILIT
24. rposes Uncertainty in total specific power mW g 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 1 MGA 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 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 abund
25. s VARNAME RELABN DRELABN DRELABNR WGTPCTM DWGTPCTM WGTPCTD DWGTPCTD SPECPWR 241RELABN 241DRELABN 241DRELABNR VCVM1 VCVM16 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 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 CBHM61L RPT Report generated on 2 06 96 8 40 43 AM MGA version MGA 9 5 Cl Spectrum ID CBNM61L CNF Sens 30 0 LT 38 9 Mins DT 44 62 Measurement date 9 08 92 Declared date 1 01 91 Sample ID SWP compare 2 Detector Total counts 7 492E 07 Pu gi cn2 3 3628 Cd g cm 1 1789 FWHM at 122 keV 528 eV QFIT 1 69 FWHM at 208 keY 657 e NOFIT 1 01 Isotope analysis at Isotope Relative we Relative x Meas date Decl date to Pu 239 to Pu 241 Err weight 4Err weight Err Pu 238 0 018440 2304 17617 0 70 18653 0 70 Pu 239 1 000000 Pu 240 0 412789 Pu 241 0 060047 Pu 242 New alg Am 241 0 051113 0 1 4927 63 78246 0 54 63 49528 0 54 1566 2
26. 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 1st Ge det depth mm non zero value indicates a telescope configuration NEFFMGAHFRAC NSPRMGA242C0 NSPRMGA242C1 NSPRMGA242C2 NSPRMGA242C3 NSPRMGA242C4 NSPRMGA242C5 NSPRMGA242C6 NSPRMGA242C7 NSPRMGA242C8 NSPRMGA242C9 DETNAME ACQDETDIAM ACQDETWIDTH MGATOTCOUNTS PRMGALEDETLM PRMGAHEDETLM MGALONGREP 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 Multiplier constant for Pu 242 calculation 1st coefficient for Pu 242 calculation 2nd coefficient for Pu 242 calculation 3rd coefficient for Pu 242 calculation 4th coefficient for Pu 242 calculation Sth coefficient for Pu 242 calculation 6th c
27. 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 1s read from the low energy spectrum 30 High energy spectrum gain zero defaulted to 0 25 0 A bad gain or zero value 1s read from the high energy spectrum 31 x MGA parameter s defaulted starting from parameter y x CAM parameters are not initialized or have an illegal value stored in the low energy spectrum see also INITIALIZATI
28. tch environment page 8 the datasource s to be analyzed must be specified in the command In the batch mode a single datasource will be treated as a low energy datasource unless the HEONLY qualifier described on page 9 is specified If a second datasource is spec ified the first datasource must be the low energy datasource and the second must be the high energy datasource 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 To ensure 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 at tempts 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 pro gram is operated in a two detector mode no analysis results are produced for either spec trum To ensure that the analysis algorithms work correctly 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 t
29. 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 A MGA Input Parameters PRMGAANALTYP ECSLOPE ECOFFSET PRMGAAMHETRO PRMGAFIXPB MGAFCDABS PRMGAFIXCD MGAFPUABS PRMGAFIXPU PRMGANSPEC NDETHIPBTHK NDETHICDTHK NDETCDCF ACQDETVOL NSPRMGASTEEL ACQDETDEPTH 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 Note The high energy spectrum has its own slope and offset Am 241 is heterogeneous 1 heterogeneous O homogeneous This parameter 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
30. y mode 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 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 se quences 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 cri teria maximum uncertainty percent in the 129 and 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 value entry is optional The program manually calculates the detector volume starting with a default amplifier of five For poor statistics and marginal resolu tion it often helps the calculations to enter the real detector value in cm The steel container thickness in mm can be entered if k
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