1. NAME AND TITLE
MAGNA: Multi-Source Gamma-Ray Kernel Integration Code System.
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
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
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.
KEYWORDS: KERNEL; GAMMA-RAY