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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.