Computer Programs

NEA-0433 GRETEL.

NEA-0433 GRETEL.

GRETEL, Ge(Li) Gamma Spectra Unfolding

NAME OR DESIGNATION OF PROGRAM, COMPUTER, NATURE OF PHYSICAL PROBLEM SOLVED, METHOD OF SOLUTION, RESTRICTIONS, CPU, UNUSUAL FEATURES OF THE PROGRAM, AUXILIARIES, STATUS, REFERENCES, REQUIREMENTS, LANGUAGE, OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED, OTHER RESTRICTIONS, NAME AND ESTABLISHMENT OF AUTHOR, MATERIAL, CATEGORIES

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1. NAME OR DESIGNATION OF PROGRAM: GRETEL.

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2. COMPUTERS

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Program name	Package id	Status	Status date
GRETEL	NEA-0433/01	Tested	01-DEC-1975

Machines used:

Package ID	Orig. computer	Test computer
NEA-0433/01	IBM 370 series	IBM 370 series

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3. NATURE OF PHYSICAL PROBLEM SOLVED

The program performs the quantitative analysis of gamma-ray spectra obtained by Ge(Li) detectors, using special libraries which are prepared for each particular problem.

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4. METHOD OF SOLUTION

The computer routines which detect and evaluate peak areas perform the following operations:
- local smoothing of the spectrum
- first derivative of the smoothed spectrum,
- peak location according to the change of sign of the first
derivative.
- computation of the net area of each peak found.

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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

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6. TYPICAL RUNNING TIME

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7. UNUSUAL FEATURES OF THE PROGRAM

An original study of the behaviour of the first derivative allows the detection of double peaks and an approximate evaluation of the areas.

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8. RELATED OR AUXILIARY PROGRAMS: RELATED AND AUXILIARY PROGRAMS

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9. STATUS

Package ID	Status date	Status
NEA-0433/01	01-DEC-1975	Tested at NEADB

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10. REFERENCES

- G. Guzzi and J. Cuypers:
'GRETEL, A Computer Program for Gamma Ray Spectrometry with Ge(Li) Detectors'.
EUR 5117.E (1974)

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11. HARDWARE REQUIREMENTS: MACHINE REQUIREMENTS

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12. PROGRAMMING LANGUAGE(S) USED

Package ID	Computer language
NEA-0433/01	FORTRAN-IV

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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED: IBM 370/OS.

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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 AUTHOR: J.R.C. EURATOM, Ispra Establishment, Ispra, Italy.

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16. MATERIAL AVAILABLE

NEA-0433/01

File name	File description	Records
NEA0433_01.001	INFORMATION	3
NEA0433_01.002	SOURCE PROGRAM F4,EBCDIC	1610
NEA0433_01.003	JCL	24
NEA0433_01.004	SAMPLE PROBLEM DATA	43
NEA0433_01.005	SPECTRA FOR SAMPLE PROBLEM	3099
NEA0433_01.006	SAMPLE PROBLEM PRINTED OUTPUT	3279
NEA0433_01.007	PLOTTING SUBROUTINES (ASSEMBLER)	1772
NEA0433_01.008	PLOTTING SUBROUTINES (F4)	1207

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17. CATEGORIES

O. Experimental Data Processing

Keywords: Li-drifted ge detectors, gamma spectra, spectra unfolding.