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NEA-0433 GRETEL.

GRETEL, Ge(Li) Gamma Spectra Unfolding

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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.