1. NAME AND TITLE

SOSUM: Multigroup Beta and Gamma-Ray Energy Sources from Activities.

2. CONTRIBUTOR

Atomics International, Canoga Park, California.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/75.

4. NATURE OF PROBLEM SOLVED

Beta and Gamma-Ray Source Strengths, in a multigroup energy structure, are computed from isotope radioactivity levels given in terms of disintegration rates.

5. METHOD OF SOLUTION

Data on the individual photon per disintegration for 181 isotopes are contained in the original library. By combining these data with activity data of a fission product inventory code, the decay energy per each of the specified energy groups is determined. The beta-ray energy is generally placed in one group on the basis of the assumed average energy, which is a function of the maximum energy and atomic number.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

Estimated running time of the packaged sample problem on the IBM 360/75: 0.5 minutes.

8. COMPUTER HARDWARE REQUIREMENTS

The code was designed for the IBM 360/370 using standard I-O.

9. COMPUTER SOFTWARE REQUIREMENTS

The code is operable on the IBM 360/75 operating system using the OS/360 H compiler.

10. REFERENCE

B. J. Dray, and R. J. Thomson, "SOSUM, A Program to Compute Multigroup Beta and Gamma Energy Sources from Radioisotope Activities," AI-AEC-MEMO-12693 (June 1968).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document and one (1.2MB) DOS diskette which contains the source code, library data, and input and output for a sample problem.

12. DATE OF ABSTRACT

May 1969; updated July 1981.