PSR-0191 EDISTR.

1. NAME OR DESIGNATION OF PROGRAM:  EDISTR.

3. DESCRIPTION OF PROGRAM OR FUNCTION

EDISTR uses as input basic radioactive decay data from the Evaluated Nuclear Structure Data File developed by the Nuclear Data Project at Oak Ridge National Laboratory and now maintained by Brookhaven National Laboratory. It  calculates the mean energies and absolute intensities of all principal radiations associated with the radioactive decay of a nuclide. The program provides a physical data base for internal dosimetry calculations or other calculations requiring detailed decay data. The principal calculations performed by EDISTR are the determination of (1) the average energy of beta particles in a beta  transition, (2) the beta spectra as a function of energy, (3) the energies and intensities of X rays and Auger electrons generated by  radioactive decay processes, (4) the bremsstrahlung spectra accompanying beta decay and monoenergetic Auger and internal conversion electrons, and (5) the radiations accompanying spontaneous fission.

4. METHOD OF SOLUTION

1. Alpha decay. Kinetic energies of the alpha particles and the associated recoil nuclei are computed using conservation of energy and momentum principles. The input data consist of the ground-state  Q value, the various excitation energies of the levels in the daughter nuclide at which the alpha transitions end, and the corresponding alpha intensities.
2. Beta decay. The average energies of the beta particles and the emitted continuous spectra are calculated using the Fermi theory of  beta decay with the input of additional data to determine the forbiddenness of the beta spectra.
3. Electron-Capture decay. The distribution of primary vacancies created in the various atomic shells and subshells as a result of the electron-capture process are calculated using the K/L/M capture  ratios.
4. Internal conversion of gamma rays. This is a process by which the energy of a transition between two states of a nucleus is transferred to an orbital electron. The distribution of the primary  vacancies in the various atomic shells and the energies and intensities of conversion electrons are calculated.
5. X-ray and Auger-electron intensities and energies. Intensities of X rays and Auger electrons are obtained using the numbers of primary vacancies in the various subshells for electron capture or for internal conversion of electrons.
6. Spontaneous fission. The fission decay fraction, the number of neutrons emitted per fission, the mass number of the parent nuclide, and the atomic number of the parent nuclide are used to compute intensities and energies for spontaneous fission fragments, neutrons, beta particles, prompt gamma rays, and delayed gamma rays.  7. Bremsstrahlung radiation. Bremsstrahlung spectra associated with beta particles and monoenergetic conversion and Auger electrons are calculated.

5. RESTRICTIONS ON THE COMPLEXITY OF THE PROBLEM

Direct Access Datasets MASTER and SUBMAS may run out of space if more than 10-15 nuclides are done at the same time. Storage space must be increased  in both the JCL and the DEFINE FILE statements in the source program to process more nuclides at one time.
SCHEME has been run with DISSPLA version 8.2. It has not been tested with version 9.

6. TYPICAL RUNNING TIME

The sample problem, when run on the IBM 3033 computer, required the  following for each of the programs:
         BLDCCT    9 seconds and 800 I/Os
         BUILDU    4 seconds and 4,000 I/Os
         LISDAT   10 seconds and 4,000 I/Os
         EDISTR   21 seconds and 4,000 I/Os
         SCHEME    5 seconds and 3,000 I/Os

NEA-DB executed the test cases included in this package on IBM 3081D.

7. UNUSUAL FEATURES OF THE PROGRAM:

8. RELATED AND AUXILIARY PROGRAMS:

BLDCCT              Generation of conversion coefficients
BUILDU              Generation of input data
LISDAT              Listing of data files
SCHEME              Preparation of DISSPLA compressed decay-schemes
                    plot file

10. REFERENCES:

- L.T. Dillman:
  EDISTR - A Computer Program to Obtain a Nuclear Decay Data Base
  for Radiation Dosimetry.
  ORNL/TM-6689  (January 1980)

11. MACHINE REQUIREMENTS:

Main storage requirements for the different modules in  the package a on IBM 3081 are as follows:
                   module      bytes
                   ------      -----
                   EDISTR      440K
                   BLDCCT      116K
                   BUILDU      100K
                   LISDAT      124K

13. OPERATING SYSTEM UNDER WHICH PROGRAM IS EXECUTED:

The test case was run on IBM 3081D under MVS-SP.

14. OTHER PROGRAMMING OR OPERATING INFORMATION OR RESTRICTIONS:

15. NAME AND ESTABLISHMENT OF AUTHORS

  Contributed by:
    Oak Ridge National Laboratory
    Oak Ridge, Tennessee

File name	File description	Records
PSR0191_01.003	INFORMATION FILE	180
PSR0191_01.004	EDISTR SOURCE PROGRAM (CARD FORMAT)	5367
PSR0191_01.005	EDISTR SOURCE PROGRAM (FOR IEBUPDTE)	5426
PSR0191_01.006	EDISTR ASSEMBLER ROUTINES (CARD FORMAT)	440
PSR0191_01.007	EDISTR ASSEMBLER ROUTINES (FOR IEBUPDTE)	443
PSR0191_01.008	BLDCCT SOURCE PROGRAM	189
PSR0191_01.009	BUILDU SOURCE PROGRAM	333
PSR0191_01.010	LISDAT SOURCE PROGRAM	353
PSR0191_01.011	JCL FOR TEST CASE EXECUTION	225
PSR0191_01.012	BLDCCT INPUT DATA	15357
PSR0191_01.013	BUILDU INPUT DATA	1604
PSR0191_01.014	EDISTR INPUT DATA FROM UNIT 5	6
PSR0191_01.015	EDISTR INPUT DATA FROM UNIT 47	2
PSR0191_01.016	EDISTR OUTPUT ON UNIT 43	128
PSR0191_01.017	BLDCCT ORIGINAL SOURCE PROGRAM	184
PSR0191_01.018	BLDCCT ORIGINAL JCL	14
PSR0191_01.019	BUILDU ORIGINAL SOURCE PROGRAM	294
PSR0191_01.020	BUILDU ORIGINAL JCL	37
PSR0191_01.021	LISDAT ORIGINAL SOURCE PROGRAM	311
PSR0191_01.022	LISDAT ORIGINAL JCL	24
PSR0191_01.023	EDISTR ORIGINAL SOURCE PROGRAM	5036
PSR0191_01.024	EDISTR ORIGINAL ASSEMBLER ROUTINES	440
PSR0191_01.025	SCHEME ORIGINAL SOURCE PROGRAM	1500
PSR0191_01.026	SCHEME ORIGINAL ASSEMBLER ROUTINES	585
PSR0191_01.027	SCHEME ORIGINAL JCL	47
PSR0191_01.028	BLDCCT ORIGINAL OUTPUT	2
PSR0191_01.029	BUILDU ORIGINAL OUTPUT	24
PSR0191_01.030	LISDAT ORIGINAL OUTPUT	29416
PSR0191_01.031	EDISTR ORIGINAL OUTPUT ON UNIT 6	1
PSR0191_01.032	EDISTR ORIGINAL OUTPUT ON UNIT 43	11
PSR0191_01.033	SCHEME ORIGINAL OUTPUT	128