NEA-0487 RADAK.

1. NAME OR DESIGNATION OF PROGRAM:  RADAK.

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.

- 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)
- 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.

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

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS

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

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

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