1. NAME AND TITLE

PLUDOS: Calculator of Ground Level External Gamma-Ray Dose from a Radioactive Plume.

2. CONTRIBUTOR

United Kingdom Atomic Energy Authority, Warrington, England, 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

PLUDOS calculates the ground level external gamma-ray dose from a radioactive gaseous effluent. The height of the release, attenuation by the air, and radioactive decay are taken into account.

5. METHOD OF SOLUTION

The plume having Gaussian cross-wise and vertical distributions of activity is replaced by a set of line sources diverging from the stack top. The dose rate from a single line is obtained using QUAD (which is based on Simpson's Rule) and the total dose rate obtained by the summing of the line dose rates to convergence.

PLUDOS calculates the dose rate at up to (1) six distances from the point of release, (2) seven values of stack height, (3) six gamma-ray energies, and (4) five decay constants.

6. RESTRICTIONS OR LIMITATIONS

The program must be resubmitted for each weather category.

7. TYPICAL RUNNING TIME

PLUDOS requires about 2 seconds per dose rate calculated.

8. COMPUTER HARDWARE REQUIREMENTS

PLUDOS is operable on the IBM 360/370.

9. COMPUTER SOFTWARE REQUIREMENTS

A FORTRAN IV compiler is required.

10. REFERENCE

J. Allen and F. Abbey, "PLUDOS A FORTRAN Program to Calculate the Ground Level Entrance Gamma Dose from a Radioactive Plume,"(no report number) (February 1973).

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

December 1981.