IAEA0832 GAMX

GAMX, Ge(Li) and Si(Li) Gamma Spectra and X-Ray Spectra Unfolding

NAME, COMPUTER, PROBLEM, SOLUTION, RESTRICTIONS, CPU, FEATURES, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM, OTHER RESTRICTIONS, AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: NAME OR DESIGNATION OF PROGRAM. GAMX, which includes four programs - GAMX1, GAMX2, GAMX3 and GAMX4.

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2. COMPUTERS

To submit a request, click below on the link of the version you wish to order. Only liaison officers are authorised to submit online requests. Rules for requesters are available here.

Program name	Package id	Status	Status date
GAMX	IAEA0832/01	Tested	27-APR-1983

Machines used:

Package ID	Orig. computer	Test computer
IAEA0832/01	IBM 3081	IBM 3081

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3. DESCRIPTION OF PROGRAM OR FUNCTION

NATURE OF PHYSICAL PROBLEM SOLVED. Evaluates accurate peak areas of gamma-ray and x-ray spectra generated by Ge(Li) and Si(Li) spectrometers. Photopeaks are approximated by a function comprising two Gaussians and an arctangent superimposed upon a cubic polynomial background.

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4. METHODS

METHOD OF SOLUTION. The analytic peak function is applied to spectra by virtue of the iterative Newton-Raphson non-linear least-squares fitting techniques. The resulting set of equations is solved by pivotal condensation with back substitution.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM. Peak analysis is limited to singlets of known energy, the package does not include automatic peak search, energy calibration or multiplet analysis facilities.

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6. TYPICAL RUNNING TIME

TYPICAL RUNNING TIME. Strongly dependent upon how well the peak is resolved, but a reasonable mean estimate is around 6 sec/peak on a 370/155.

IAEA0832/01

NEA-DB ran all four modules in sequence on IBM 3081 in 1 second.

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7. UNUSUAL FEATURES

UNUSUAL FEATURES OF THE PROGRAM. The package allows singlet photopeaks to be accurately characterised rendering in addition to peak area, accurate estimates of centroid position, peak height, width and background in peak vicinity. It is typically found that the error computed for the area of each individual peak is of the order of twice the uncertainty to be expected purely from statistics.

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8. RELATED OR AUXILIARY PROGRAMS

RELATED AND AUXILIARY PROGRAMS. GAMX4 requires the proprietary CALCOMP software for the CALCOMP 936 plotter.

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9. STATUS

Package ID	Status date	Status
IAEA0832/01	27-APR-1983	Tested at NEADB

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10. REFERENCES: REFERENCES.

IAEA0832/01, included references:

- J. White:
  GAMX - A Computer Program For the Evaluation of Gamma-Ray and
  X-Ray Peak Areas from Spectra Generated by Semiconductor
  Detectors
  PEL-255 (November 1976)

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11. HARDWARE REQUIREMENTS

MACHINE REQUIREMENTS. The largest storage requirement of any program in the package is 80 kbytes. GAMX4 was designed to utilise a CALCOMP (model 936) digital increment plotter.

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
IAEA0832/01	FORTRAN-IV

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13. SOFTWARE REQUIREMENTS

OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED.
MVS/ST (IBM 3081).

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14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS.

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15. NAME AND ESTABLISHMENT OF AUTHORS

NAME AND ESTABLISHMENT OF AUTHOR.
J. White
Atomic Energy Board
Private Bag 256
Pretoria 0001
South Africa

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16. MATERIAL AVAILABLE

IAEA0832/01

File name	File description	Records
IAEA0832_01.003	GAMX INFORMATION FILE	79
IAEA0832_01.004	GAMX JOB CONTROL INSTRUCTIONS	111
IAEA0832_01.005	GAMX1 SOURCE (FORTAN-4)	354
IAEA0832_01.006	GAMX2 SOURCE (FORTAN-4)	474
IAEA0832_01.007	GAMX3 SOURCE (FORTAN-4)	587
IAEA0832_01.008	GAMX4 SOURCE (FORTAN-4)	173
IAEA0832_01.009	GAMX1 TEST CASE INPUT DATA	28
IAEA0832_01.010	GAMX2 TEST CASE INPUT DATA	44
IAEA0832_01.011	GAMX3 TEST CASE INPUT DATA	45
IAEA0832_01.012	GAMX4 TEST CASE INPUT DATA	30
IAEA0832_01.013	GAMX1 TEST CASE PUNCHED OUTPUT	7
IAEA0832_01.014	GAMX2 TEST CASE PUNCHED OUTPUT	16
IAEA0832_01.015	GAMX1 TEST CASE PRINTED OUTPUT	37
IAEA0832_01.016	GAMX2 TEST CASE PRINTED OUTPUT	49
IAEA0832_01.017	GAMX3 TEST CASE PRINTED OUTPUT	45

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17. CATEGORIES

O. Experimental Data Processing

Keywords: Li-drifted ge detectors, gamma radiation, iterative methods, least square fit, spectra, spectrometers.