NEA-0487: RADAK, Multichannel Analyser Neutron Spectra and Gamma Spectra Unfolding

OECD Nuclear Energy Agency / L'Agence pour l'énergie nucléaire

OECD-OCDE

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NEA-0487 RADAK. (Abstract last modified 01-AUG-1977)

RADAK, Multichannel Analyser Neutron Spectra and Gamma Spectra Unfolding

Abstract Table of Contents:

OPERATING SYSTEM

OTHER RESTRICTIONS

1. NAME OR DESIGNATION OF PROGRAM - RADAK.

2. COMPUTER FOR WHICH PROGRAM IS DESIGNED AND OTHER MACHINE VERSION PACKAGES AVAILABLE -

To request or retrieve programs click on the one of the active versions below. A password and special authorization is required.

Explanation of the status codes.

Program-name Package-ID Status RADAK NEA-0487/01 Tested RADAK NEA-0487/02 Tested

Machines used: Package-ID Orig.Computer Test Computer NEA-0487/01 CDC 7600 CDC 7600 NEA-0487/02 IBM 370 series IBM 370 series

3. NATURE OF PHYSICAL PROBLEM SOLVED - RADAK unfolds flux spectra from the output of multi-channel and single-channel neutron or gamma ray detectors. The errors, including correlations, of the flux solution are estimated.

4. METHOD OF SOLUTION - The solution is determined which maximises the likelihood of the observed measurements subject to the fluxes remaining positive. The errors are estimated using Monte Carlo, by taking random samples about the measurements.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM -
Maximum number of -
                    spectra unfolded simultaneously - 10
                    detector channels - 200
                    flux groups - 60

6. TYPICAL RUNNING TIME - 3 minutes CPU for unfolding (with error analysis) the output from 5 proportional counters and 3 threshold detectors at 3 positions. 60 flux groups were used, and a total of 76 channels.

7. UNUSUAL FEATURES OF THE PROGRAM - The output from several multi-channel and single-channel detectors may be analysed simultaneously to produce a single-valued flux solution. Allowance may be made for the uncertainties in the detector response functions.

8. RELATED AND AUXILIARY PROGRAMS - The program package also contains two auxiliary programs, PRC and NE213, which generate response matrices respectively for gas-filled spherical proportional counters and NE213 organic liquid scintillation spectrometers. The NE213 program may also be used for grouping or differentiating the counts from any type of spectrometer in preparation for input to RADAK. Several routines from the Harwell subroutine library are included.

9. STATUS
NEA-0487/01: 01-OCT-1979 Tested at NEADB
NEA-0487/02: 01-AUG-1977 Tested at NEADB

10. REFERENCES  -
NEA-0487/01:
- M.J. Grimstone:
  The RADAK Users Manual
  AEEW-M1455 (December 1976)
- M.J. Grimstone:
  Improved Facilities for Response Matrix Adjustment in RADAK
  AEEW-M1483 (July 1977)
- J. Patry:
  Three Programs for the Calculation of Flux Spectra from the Output
  of Neutron or Gamma-ray Detectors: PRC, NE213 and RADAKA
  TM-RZ-58/2 (December 7, 1978)
NEA-0487/02:
- M.J. Grimstone:
  The RADAK Users Manual
  AEEW-M1455 (December 1976)
- M.J. Grimstone:
  Improved Facilities for Response Matrix Adjustment in RADAK
  AEEW-M1483 (July 1977)

11. MACHINE REQUIREMENTS - The program requires 350 kbytes of core storage.

12. PROGRAMMING LANGUAGE(S) USED -
NEA-0487/01: FORTRAN+ASSEMBLER
NEA-0487/02: FORTRAN+ASSEMBLER

13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED - IBM 370 O.S. MVS.

14. ANY OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS -

15. NAME AND ESTABLISHMENT OF AUTHOR -
    Mr. M.J. Grimstone
    UKAEA
    Atomic Energy Establishment
    Winfrith, Dorchester, Dorset
    United Kingdom

16. MATERIAL AVAILABLE -
NEA-0487/01:
NEA0487_01.001    SOURCE (F4,ASSEMBLER)                            2541 records
NEA0487_01.002    SAMPLE INPUT DATA                                 723 records
NEA0487_01.003    SAMPLE OUTPUT                                    2190 records
NEA0487_01.004    PRC (CAL. OF RESPONSE MATRIX FOR RADAK)          1232 records
NEA0487_01.005    SAMPLE INPUT FOR PRC                               46 records
NEA0487_01.006    SAMPLE OUTPUT OF PRC                              237 records
NEA0487_01.007    NE213 (PREPARATION OF RESPONSE MATRIX)           1042 records
NEA0487_01.008    SAMPLE INPUT FOR NE213                             22 records
NEA0487_01.009    SAMPLE OUTPUT OF NE213                            848 records
NEA0487_01.010    FEHLIM (COMPUTATION OF ERROR FUNCTION)             13 records
NEA-0487/02:
NEA0487_02.001    INFORMATION                                         2 records
NEA0487_02.002    PRC ASSEMBLER ROUTINES                             75 records
NEA0487_02.003    PRC F4 SOURCE  EBCDIC                            1782 records
NEA0487_02.004    PRC SAMPLE PROBLEM INPUT                           14 records
NEA0487_02.005    PRC SAMPLE PROBLEM OUTPUT                         764 records
NEA0487_02.006    NE213 ASSEMBLER ROUTINES                          161 records
NEA0487_02.007    NE213 F4 SOURCE  EBCDIC                          1883 records
NEA0487_02.008    NE213 SAMPLE PROBLEM INPUT                         41 records
NEA0487_02.009    NE213 SAMPLE PROBLEM OUTPUT                       183 records
NEA0487_02.010    RADAK ASSEMBLER ROUTINES                          267 records
NEA0487_02.011    RADAK F4 SOURCE  EBCDIC                          3239 records
NEA0487_02.012    RADAK SAMPLE PROBLEM INPUT                        624 records
NEA0487_02.013    RADAK SAMPLE PROBLEM OUTPUT                      6331 records
NEA0487_02.014    JCL AND INFORMATION                               100 records

17. CATEGORIES -

- O. Experimental Data Processing

Keywords: GAMMA SPECTRA, MONTE CARLO METHOD, MULTI-CHANNEL ANALYSERS, NEUTRON DETECTORS, NEUTRON FLUX, NEUTRON SPECTRA, SPECTRA UNFOLDING, SPECTROMETERS

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