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NESC9479 MGA.

MGA, Pu Isotope Abundance from Multichannel Analyzer Gamma Spectra

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1. NAME OR DESIGNATION OF PROGRAM:  MGA.
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2. COMPUTERS
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Program name Package id Status Status date
MGA NESC9479/01 Tested 11-MAR-1993

Machines used:

Package ID Orig. computer Test computer
NESC9479/01 DEC VAX series DEC VAX 8810
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3. DESCRIPTION OF PROGRAM OR FUNCTION

The MGA (Multiple Group Analysis) program determines the relative abundances of plutonium and other actinide isotopes in different materials. The program analyzes spectra taken of such samples using a 4096-channel germanium (Ge) gamma-ray spectrometer. The code can be run in a one  or two detector mode. The first spectrum which is required and must  be taken at a gain of .075 Kev/channel with a high resolution planar detector, contains the 0-300Kev energy region. The second spectrum,  which is optional, must be taken at a gain of 0.25 Kev/channel; it becomes important when analyzing high burnup samples (concentration  of Pu(241) greater than one percent). Isotopic analysis precisions of one percent or better can be obtained, and no calibrations are required. The system also measures the abundances of U(235,238), Np237, and Am241. A special calibration option is available to perform a one-time peak-shape characterization when first using a new detector system.
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4. METHOD OF SOLUTION

The basic mathod for determining the relative abundance of the isotopes of plutonium is to measure the intensity of two or more peaks from gamma rays of similar energy, but arising  from different isotopes. Since the gamma-ray emission probabilities  and half-lives are known, the atom ratios can be calculated provided relative detection efficiencies for the peaks can be estimated.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM:
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6. TYPICAL RUNNING TIME:  Analysis time is less than one minute.
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7. UNUSUAL FEATURES OF THE PROGRAM:
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8. RELATED AND AUXILIARY PROGRAMS:
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9. STATUS
Package ID Status date Status
NESC9479/01 11-MAR-1993 Tested at NEADB
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10. REFERENCES

- R. Gunnink:
  MGA2 - A One-Detector Code for Rapid High-Precision Plutonium
  Measurements
  UCRL-96016 Rev. 1, Preprint (July 1987).
NESC9479/01, included references:
- R. Gunnink:
  MGA - A Gamma-Ray Spectrum Analysis Code for Determining Plutonium
  Isotopic Abundances
  Volume 1, Methods and Algorithms
  UCRL-LR-103220, Vol.1 (April 3, 1990).
- R. Gunnink:
  A New One-Detector Analysis Method for Rapid High-Precision
  Plutonium Isotopic Measurements
  Reprinted from the Proceedings of the 9th ESARDA Symposium on
  Safeguards and Nuclear Material Management, London, UK.,
  pp. 167-171 (May 12-14, 1987).
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11. MACHINE REQUIREMENTS:
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NESC9479/01 FORTRAN-77
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13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:  VMS.
NESC9479/01
The program was compiled by NEA-DB on a DEC VAX 8810 computer under VMS V5.4-2 using the DEC/VAX FORTRAN-77 compiler. The test case was run interactively.
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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:
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15. NAME AND ESTABLISHMENT OF AUTHORS

         R. Gunnink
         Lawrence Livermore National Laboratory
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16. MATERIAL AVAILABLE
NESC9479/01
File name File description Records
NESC9479_01.001 Information file 102
NESC9479_01.002 000004.Z17 0
NESC9479_01.003 000575.H27 0
NESC9479_01.004 AVE FOR 0
NESC9479_01.005 BKGD.FOR 103
NESC9479_01.006 BKGRD.FOR 131
NESC9479_01.007 BWF.FOR 71
NESC9479_01.008 C2JDAT.FOR 24
NESC9479_01.009 CALERR.FOR 20
NESC9479_01.010 FOR007.DAT Sample problem output 103
NESC9479_01.011 GFIT.FOR 102
NESC9479_01.012 GRP100.DAT 31
NESC9479_01.013 GRP340.DAT 22
NESC9479_01.014 GRP660.DAT 18
NESC9479_01.015 J2CDAT.FOR 30
NESC9479_01.016 MATINV.FOR 80
NESC9479_01.017 MAXVAL.FOR 48
NESC9479_01.018 MGA.COM 16
NESC9479_01.019 MGA.FOR 129
NESC9479_01.020 MGA.RUN 5
NESC9479_01.021 MGA100.FOR 353
NESC9479_01.022 MGA235.FOR 174
NESC9479_01.023 MGA300.CMN 31
NESC9479_01.024 MGA300.FOR 253
NESC9479_01.025 MGA45.FOR 178
NESC9479_01.026 MGA600.FOR 250
NESC9479_01.027 MGA94.FOR 636
NESC9479_01.028 MGAABS.FOR 548
NESC9479_01.029 MGACAL.CMN 5
NESC9479_01.030 MGACAL.FOR 545
NESC9479_01.031 MGACOM.CMN 104
NESC9479_01.032 MGADAT.CMN 8
NESC9479_01.033 MGAEQS.FOR 273
NESC9479_01.034 MGAGAN.FOR 250
NESC9479_01.035 MGAHIE.FOR 528
NESC9479_01.036 MGAOUT.FOR 307
NESC9479_01.037 MGAPKS.FOR 437
NESC9479_01.038 MGASPC.FOR 461
NESC9479_01.039 NCNTS.FOR 61
NESC9479_01.040 PKFIT.CMN 4
NESC9479_01.041 PKFIT.FOR 691
NESC9479_01.042 RDCHN.FOR 9
NESC9479_01.043 RDCHN2.FOR 54
NESC9479_01.044 RDCHN3.FOR 58
NESC9479_01.045 SHAPC.Z1 15
NESC9479_01.046 SHAPC2.H2 10
NESC9479_01.047 SPRAM.FOR 85
NESC9479_01.048 STRIP1.FOR 85
NESC9479_01.049 UTFSBS.FOR 397
NESC9479_01.050 UTLIB.OLB 0
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17. CATEGORIES
  • D. Depletion, Fuel Management, Cost Analysis, and Power Plant Economics
  • O. Experimental Data Processing

Keywords: plutonium, spectra.