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NEA-0487 RADAK.

RADAK, Multichannel Analyser Neutron Spectra and Gamma Spectra Unfolding

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1. NAME OR DESIGNATION OF PROGRAM:  RADAK.
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2. COMPUTERS
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Program name Package id Status Status date
RADAK NEA-0487/01 Tested 01-OCT-1979
RADAK NEA-0487/02 Tested 01-AUG-1977

Machines used:

Package ID Orig. computer Test computer
NEA-0487/01 CDC 7600 CDC 7600
NEA-0487/02 IBM 370 series IBM 370 series
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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.
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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.
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5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Maximum number of

                    spectra unfolded simultaneously - 10
                    detector channels - 200
                    flux groups - 60
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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.
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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.
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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.
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9. STATUS
Package ID Status date Status
NEA-0487/01 01-OCT-1979 Tested at NEADB
NEA-0487/02 01-AUG-1977 Tested at NEADB
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10. REFERENCES
NEA-0487/01, included references:
- 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, included references:
- 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)
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11. MACHINE REQUIREMENTS:  The program requires 350 kbytes of core storage.
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12. PROGRAMMING LANGUAGE(S) USED
Package ID Computer language
NEA-0487/01 FORTRAN+ASSEMBLER
NEA-0487/02 FORTRAN+ASSEMBLER
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13. OPERATING SYSTEM OR MONITOR UNDER WHICH PROGRAM IS EXECUTED:  IBM 370 O.S. MVS.
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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

    Mr. M.J. Grimstone
    UKAEA
    Atomic Energy Establishment
    Winfrith, Dorchester, Dorset
    United Kingdom
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16. MATERIAL AVAILABLE
NEA-0487/01
File name File description Records
NEA0487_01.001 SOURCE (F4,ASSEMBLER) 2541
NEA0487_01.002 SAMPLE INPUT DATA 723
NEA0487_01.003 SAMPLE OUTPUT 2190
NEA0487_01.004 PRC (CAL. OF RESPONSE MATRIX FOR RADAK) 1232
NEA0487_01.005 SAMPLE INPUT FOR PRC 46
NEA0487_01.006 SAMPLE OUTPUT OF PRC 237
NEA0487_01.007 NE213 (PREPARATION OF RESPONSE MATRIX) 1042
NEA0487_01.008 SAMPLE INPUT FOR NE213 22
NEA0487_01.009 SAMPLE OUTPUT OF NE213 848
NEA0487_01.010 FEHLIM (COMPUTATION OF ERROR FUNCTION) 13
NEA-0487/02
File name File description Records
NEA0487_02.001 INFORMATION 2
NEA0487_02.002 PRC ASSEMBLER ROUTINES 75
NEA0487_02.003 PRC F4 SOURCE EBCDIC 1782
NEA0487_02.004 PRC SAMPLE PROBLEM INPUT 14
NEA0487_02.005 PRC SAMPLE PROBLEM OUTPUT 764
NEA0487_02.006 NE213 ASSEMBLER ROUTINES 161
NEA0487_02.007 NE213 F4 SOURCE EBCDIC 1883
NEA0487_02.008 NE213 SAMPLE PROBLEM INPUT 41
NEA0487_02.009 NE213 SAMPLE PROBLEM OUTPUT 183
NEA0487_02.010 RADAK ASSEMBLER ROUTINES 267
NEA0487_02.011 RADAK F4 SOURCE EBCDIC 3239
NEA0487_02.012 RADAK SAMPLE PROBLEM INPUT 624
NEA0487_02.013 RADAK SAMPLE PROBLEM OUTPUT 6331
NEA0487_02.014 JCL AND INFORMATION 100
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17. CATEGORIES
  • O. Experimental Data Processing

Keywords: Monte Carlo method, gamma spectra, multi-channel analysers, neutron detectors, neutron flux, neutron spectra, spectra unfolding, spectrometers.