Computer Programs

NESC9479 MGA.

NESC9479 MGA.

MGA, Pu Isotope Abundance from Multichannel Analyzer Gamma Spectra

NAME OR DESIGNATION OF PROGRAM, COMPUTER, DESCRIPTION OF PROGRAM OR FUNCTION, METHOD OF SOLUTION, RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM, TYPICAL RUNNING TIME, UNUSUAL FEATURES OF THE PROGRAM, RELATED AND AUXILIARY PROGRAMS, STATUS, REFERENCES, MACHINE REQUIREMENTS, LANGUAGE, OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED, OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHORS, MATERIAL, CATEGORIES

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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.