1. NAME AND TITLE

DISDOS: Calculation of Dose Distribution in Human Phantoms Irradiated by External Photon Sources.

AUXILIARY ROUTINES

DISDOS-HOPHO: Homogeneous Phantom Model

DISDOS-INHOPHO: Inhomogeneous Phantom Model.

2. CONTRIBUTORS

Central Research Institute for Physics, Budapest, Hungary (A).

HEW/FDA Bureau of Radiological Health, Rockville, Maryland (B).

3. CODING LANGUAGE AND COMPUTER

ICL FORTRAN; ICL 1905 (A) or FORTRAN IV; IBM 360 (B).

4. NATURE OF PROBLEM SOLVED

The absorbed dose (actually kerma) is calculated for simplified human phantoms (elliptical cylinders) irradiated by external photon sources. The phantoms are divided into three parts: head, trunk, and legs. Three source distributions are considered: collimated beam, point source, and isotropic irradiation; other sources may be considered since the codes are segmented.

5. METHOD OF SOLUTION

Monte Carlo calculations provide estimates of the dose and the standard deviation in each zone. The source energy spectrum may be discrete, uniformly distributed in an energy range, or given by a piece-wise continuous function.

6. RESTRICTIONS OR LIMITATIONS

Pair production is accounted for in the field of the nuclei only. Electron binding corrections to Compton scattering are omitted. The body has 22 organs.

7. TYPICAL RUNNING TIME

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

The sample problems in Version B ran on the IBM 360/91 as follows:

DISDOS-HOPHO 25 seconds

DISDOS-INHOPHO 1 minute.

8. COMPUTER HARDWARE REQUIREMENTS

DISDOS was designed for the ICL 1905 computer (A). It was converted to be operable on the IBM 360 computer (B).

9. COMPUTER SOFTWARE REQUIREMENTS

Standard FORTRAN compilers for the two different operating systems are required.

10. REFERENCE

L. Koblinger, "Two Codes for Calculation of Dose Distribution in Human Phantoms Irradiated by External Photon Sources," KFKI-71-12 (February 1971).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

March 1973; revised April 1975.

KEYWORDS: GAMMA-RAY; PHANTOM