1. NAME AND TITLE

CYLDOS: A Cylindrical Geometry Gamma-Ray Flux Attenuation Code System.

2. CONTRIBUTOR

The United Kingdom Atomic Energy Authority, Risley, Warrington, England, through the OECD NEA Data Bank, Gif-sur-Yvette, France.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

CYLDOS was developed for the purpose of finding dose rates and gamma-ray spectra at specified points arising from an assembly of cylindrical sources and shields. The program calculates gamma-ray fluxes throughout a shield.

5. METHOD OF SOLUTION

CYLDOS calculates for specified points in a shield (which can be adequately represented by an array of parallel cylinders not necessarily concentric) the gamma-ray fluxes and dose-rates arising from a source region which also must be specified in cylindrical geometry. The cylindrical regions may have gamma-ray sources within them.

The method used for calculating the dose-rates is based on a point-kernel method of integration. Scattering of the gamma-rays by source and shield materials is treated by the inclusion of Taylor point buildup coefficients within the expressions for the gamma-ray fluxes.

6. RESTRICTIONS OR LIMITATIONS

Although a shield may be represented by cylindrical geometries of the type accepted by CYLDOS, it is difficult to justify the accuracy of calculations involving Taylor buildup factors, especially where the line-of-sight path between source point and dose point is not perpendicular to the shield boundaries.

7. TYPICAL RUNNING TIME

No study has been made by RSIC of typical running times for CYLDOS.

8. COMPUTER HARDWARE REQUIREMENTS

The code is operable on the IBM 360/370 computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran IV compiler is required.

10. REFERENCE

B. L. Richardson, "CYLDOS A Cylindrical Geometry Gamma-Ray Flux Attenuation Code," TRG Memorandum 7506 (April 1977).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

February 1982; revised February 1983.