1. NAME AND TITLE

RADOS: Gamma-Ray Dose Estimation from Cloud of Radioactive Gases by Kernel Integration.

2. CONTRIBUTOR

Savannah River Laboratory, E. I. du Pont de Nemours and Company, Aiken, South Carolina.

3. CODING LANGUAGE AND COMPUTER

FORTRAN IV; IBM 360/65 and 360/75.

4. NATURE OF PROBLEM SOLVED

RADOS represents the finite spatial distribution of airborne source material as an infinite number of line sources. The code provides a means of rapidly calculating whole body gamma-ray dose from a finite cloud of radioactive material.

5. METHOD OF SOLUTION

The calculational method is based on the assumption that there is no change in the size and shape of the radioactive cloud of unit thickness during the time the cloud will irradiate the receptor. For an instantaneous release, the entire dose may be considered as being accumulated in unit time from a cloud extending to infinity in both directions from the receptor. This assumption permits the total dose to be calculated as the sum of the doses from an infinite number of line sources.

6. RESTRICTIONS OR LIMITATIONS

The following limitations must be considered:

a. The code permits dose calculations only on the axial center of the cloud path.

b. The receptor should be > 600 meters downwind from the release point.

c. The gamma-ray energy group structure is limited to the range 0.5 MeV to 2.0 MeV.

7. TYPICAL RUNNING TIME

The program required less than 2 seconds on the IBM 360/65 for a four energy group, 12 isotope, 1 distance problem.

Estimated running time on the IBM 360/75 for the packaged sample problem: 1 minute, 18 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

The code was designed for the IBM 360/65, using standard I-O.

9. COMPUTER SOFTWARE REQUIREMENTS

The code is operable on the IBM 360/75 Operating System using OS-360 Fortran H Compiler.

10. REFERENCES

Errata DP-1098, "RADOS, A Code to Estimate Gamma Dose from a Cloud of Radioactive Gases."

R. E. Cooper, "RADOS, A Code to Estimate Gamma Dose from a Cloud of Radioactive Gases," DP-1098 (June 1967).

L. M. Arnett, "Calculation of Radiation Dose from a Cloud of Radioactive Gases," Nuclear Applications, Vol. 3, p. 217-221 (April 1967).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

May 1969; updated July 1981, February 1985, October 1991.