1. NAME AND TITLE

DOSFACTER II: Calculation of Dose-Rate Conversion Factors for Exposure to Photons and Electrons.

2. CONTRIBUTORS

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

Duquesene Light, Shippingport, Pennsylvania.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 370/3033 (A) and VAX (B).

4. NATURE OF PROBLEM SOLVED

DOSFACTER II is a revision of the DOSFACTER code. It estimates dose-rate conversion factors for exposure to photons and electrons emitted by radionuclides dispersed in the environment. The exposure modes considered are immersion in contaminated air, immersion in contaminated water, and irradiation at a height of 1 m above a contaminated ground surface. The source region for each exposure mode is assumed to be effectively infinite or semi-infinite in extent with a uniform radionuclide concentration throughout the source region. The dose-rate factors are computed for a whole-body dose and for a dose to 24 body organs.

5. METHOD OF SOLUTION

For air and water immersion, the body-surface dose-rate factors were based on the conservation of energy requirement that all of the emitted energy is absorbed in the infinite medium. For ground-surface exposure, the body-surface dose-rate factors were calculated at a point 1 m above the ground using a point-kernel integration method and known specific absorbed fractions for photons and electrons in air. For photons only, the dose-rate factors for 24 body organs were calculated for each exposure mode using the organ dose-rate factors for air immersion estimated by Poston and Snyder.

The radioactive decay data are taken from the data library DLC-80/DRALIST which is available from RSIC.

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

Running time varies with the number of nuclides treated. The sample problem (9 nuclides) ran in less than 8 seconds on the IBM 370/3033 computer and ran in a few seconds on the VAX 8600.

8. COMPUTER HARDWARE REQUIREMENTS

DOSFACTER II is operable on the IBM 370/3033 computer and the VAX/VMS family of computers.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran H compiler is required for the IBM version. The VAX Fortran compiler Version 4.6 was used on the 8600.

10. REFERENCES

D. C. Kocher, "Dose-Rate Conversion Factors for External Exposure to Photons and Electrons," ORNL/NUREG-79, NUREG/CR-1918 (August 1981).

D. C. Kocher to D. K. Trubey, "Subject: Revised DOSFACTER Files," Memo (December 1980).

D. C. Kocher, "Dose-Rate Conversion Factors for External Exposure to Photons and Electrons," Trans. Am. Nucl. Soc., 34, 84-85 (June 1980).

11. CONTENTS OF CODE PACKAGE

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

12. DATE OF ABSTRACT

February 1982, revised November 1988.