1. NAME AND TITLE

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

2. CONTRIBUTORS

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

Royal Observatory of Hong Kong, Kowloon.

3. CODING LANGUAGE AND COMPUTER

Fortran IV; IBM 3033 and Data General MV/20000.

4. NATURE OF PROBLEM SOLVED

DOSFACTER-DOE is a revision of the DOSFACTER II 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 dose to 23 body organs and for an effective dose.

The present code differs from DOSFACTER II as follows: no body surface factors, "total body" factors replaced by "effective" (weighted) factors, electron dose factors for the skin calculated for several depths, and output format. Non-SI units are used.

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 23 body organs were calculated for each exposure mode using the organ dose-rate factors for air immersion estimated by Eckerman et al.

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

6. RESTRICTIONS OR LIMITATIONS

The code is known to compile correctly only with a Fortran IV compiler.

7. TYPICAL RUNNING TIME

Running time varies with the number of nuclides treated. The sample problem (9 nuclides) executed in 14 seconds on the IBM 3033 computer.

8. COMPUTER HARDWARE REQUIREMENTS

DOSFACTER-DOE is operable on the IBM 3033 computers. Information included in the READ.ME file contains modifications required to make the code operable on the DG MV/20000.

9. COMPUTER SOFTWARE REQUIREMENTS

A Fortran H compiler is required on the IBM under OS/VS2. The Data General AOS/VS operating system and Fortran 77 compiler were used for the MV version. DLC-80/DRALIST is required for input.

10. REFERENCES

D. C. Kocher and K. F. Eckerman, "External Dose-Rate Conversion Factors for Calculation of Dose to the Public," DOE/EH-0070, U.S. Dept. of Energy (July 1988).

"Informal Notes on Data General Conversion," The Royal Observatory of Hong Kong (January 1990).

11. CONTENTS OF CODE PACKAGE

Included are the referenced documents (without appendices) and 1 DS/DD (360 K) 5.25-in. diskette which contains the source code, sample problem input, and output.

12. DATE OF ABSTRACT

December 1988, updated January 1990.