1. NAME AND TITLE
CYGAS: A Gamma-Ray Attenuation Code System for Large Gamma-Ray Sources Shielded by
Kjeller Computer Installation, Kjeller, Norway, through the NEA OECD Data Bank, Gif-sur-Yvette, France.
3. CODING LANGUAGE AND COMPUTER
FORTRAN IV; IBM 360/370.
4. NATURE OF PROBLEM SOLVED
CYGAS computes the gamma-ray flux and dose in three-dimensional geometry around a cylindrical
source of finite height shielded by coaxial infinite cylindrical shields in the radial direction and slab
shields in the axial direction.
5. METHOD OF SOLUTION
The axial flux at each specified dosepoint is determined by integration of the disk source
attenuation kernel with the Taylor buildup factor for a plane source. The radial flux at each dose point,
specified by R-Z coordinates, is calculated by integration of the line source kernel with the Taylor
6. RESTRICTIONS OR LIMITATIONS
The program handles 50 regions of different materials and 10 different buildup factors.
7. TYPICAL RUNNING TIME
No study has been made by RSIC of typical running times for CYGAS.
8. COMPUTER HARDWARE REQUIREMENTS
CYGAS is operable on the IBM 360/370. It requires 32 K of storage.
9. COMPUTER SOFTWARE REQUIREMENTS
A FORTRAN IV compiler is required.
T. O. Sauer, "CYGAS, An Attenuation Code for Large Cylindrical Gamma Sources with
11. CONTENTS OF CODE PACKAGE
Included are the referenced document and one (1.2MB) DOS diskette which contains the source
codes and sample problem input and output.
12. DATE OF ABSTRACT
KEYWORDS: GAMMA-RAY; CYLINDRICAL GEOMETRY; KERNEL