1. NAME AND TITLE

MAGNA: Multi-Source Gamma-Ray Kernel Integration Code System.

2. CONTRIBUTOR

Institut for Atomenergi, Kjeller Research Establishment, Kjeller, Norway through the NEA Computer Programme Library, Ispra (Varese), Italy.

3. CODING LANGUAGE AND COMPUTER

FORTRAN; CDC 3600.

4. NATURE OF PROBLEM SOLVED

Gamma-ray dose rates are computed for chosen points in and around a complex arrangement of point or cylindrical gamma-ray sources and slab, cylindrical or cylindrical shell shields.

5. METHOD OF SOLUTION

Dose rates are calculated by point kernel integration using a multi-layer buildup factor. Spatial integration is accomplished by summing multiple point sources. Self shielding (attenuation in the source region) and shadow shielding are included. The buildup factor function is either the Taylor form or the Russian (Broder) form which accounts for multiple layers.

6. RESTRICTIONS OR LIMITATIONS

The following limits are noted: 7 gamma-ray energies, 10 different materials, 350 sources, 500 cylinders (sources and/or shields) and/or cylinder shells, and 6 slab shields.

7. TYPICAL RUNNING TIME

Running time is roughly proportional to the number of shields and total number of non-point sources, and also dependent upon source volume and self-absorption coefficient or source-dose point distance.

8. COMPUTER HARDWARE REQUIREMENTS

The code is operable on CDC computers with standard equipment.

9. COMPUTER SOFTWARE REQUIREMENTS

The packaged version has been compiled and executed on the FORTRAN 3600 Monitor System.

10. REFERENCES

U. Tveten, "MAGNA, A Multi-Source Gamma Shielding Programme," KR-111 (June 1966).

U. Tveten, "MAGNA, A Gamma Computer Programme," IFS-RPS Memo 82.

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

June 1972; revised December 1984.