1. NAME AND TITLE

SFACTOR: Dose Equivalent to a Target Organ Calculator.

2. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

3. CODING LANGUAGE AND COMPUTER

PL/I; IBM 360/370.

4. NATURE OF PROBLEM SOLVED

SFACTOR was developed to estimate the average dose equivalent to each of a specified list of target organs of man per microcurie-day residence of an internally deposited radionuclide in given source organs.

5. METHOD OF SOLUTION

For each type of decay for a given radionuclide (alpha, beta, photon, or spontaneous fission), the contribution to the dose equivalent rate is calculated according to equations specified in the reference report (ORNL/NUREG/TM-85, 1977). Of principal importance in the calculation of photon contributions are the specific absorbed fractions. These were computed by Monte Carlo techniques and published previously in an Oak Ridge National Laboratory report (ORNL-5000, 1974).

6. RESTRICTIONS OR LIMITATIONS

None noted.

7. TYPICAL RUNNING TIME

Running time is variable, depending upon the decay scheme of the radionuclide under study. Compilation time on the IBM 360/91 is approximately 15 seconds and execution time varies from 2 to 30 seconds.

8. COMPUTER HARDWARE REQUIREMENTS

The code is operable on the IBM 360/370. Punch and printer output devices are required.

9. COMPUTER SOFTWARE REQUIREMENTS

A PL/I compiler is required.

10. REFERENCES

a. Included in the document:

D. E. Dunning, Jr., J. C. Pleasant, and G. G. Killough, "SFACTOR: A Computer Code for Calculating Dose Equivalent to a Target Organ per Microcurie-Day Residence of a Radionuclide in a Source Organ," ORNL/NUREG/TM-85, NUREG/CR-1523 (November 1977).

b. Background information:

W. S. Snyder, et al., "A Tabulation of Dose Equivalent per Microcurie-Day for Source and Target Organs of an Adult for Various Radionuclides," ORNL-5000 Part 1 (November 1974).

W. S. Snyder, et al., "A Tabulation of Dose Equivalent per Microcurie-Day for Source and Target Organs of an Adult for Various Radionuclides," ORNL-5000 Part 2 (November 1975).

11. CONTENTS OF CODE PACKAGE

Included are the referenced document (10.a) and one (1.2MB) DOS diskette which contains the source code and sample problem input and output.

12. DATE OF ABSTRACT

December 1981.