1. NAME and TITLE of DATA LIBRARY

FGR-DOSE: Dose Coefficients from Federal Guidance Reports 11 and 12.

2. NAME and TITLE of DATA RETRIEVAL PROGRAM

READEM, a program to read dose coefficient data files and display them on the screen.

3. CONTRIBUTOR

Oak Ridge National Laboratory, Oak Ridge, Tennessee.

4. HISTORICAL BACKGROUND INFORMATION

The data library contains dose coefficients for both intakes and external exposures to radionuclides. The dose coefficients for radionuclide intake were computed at ORNL during preparation of ICRP Publication 30. Coefficients for intakes for some organs were published in the Supplements to Publication 30.

The dose coefficients of this library are based on the nuclear decay data of ICRP Publication 38. The external dose coefficients may be considered to supersede those of DLC-144/DOSDAT-DOE. The latter data library was produced using the DOSFACTER-DOE code (CCC-536/DOSFACTER-DOE) with the nuclear decay data library DLC-80/DRALIST. The DOSFACTER-DOE code was described in DOE/EH-0070 and was developed by D.C. Kocher. The internal dose coefficients were computed at ORNL using the ICRP code of Watson and Ford (CCC-384/IDC) and were abstracted from the ICRP/ORNL dosimetric data files during preparation of Federal Guidance Report 11.

5. APPLICATIONS of the DATA

The dose coefficients contained in the library have application in occupational and environmental dose assessments. The coefficients for radionuclide intakes, from FGR 11, were used in the derivation of the Annual Limits on Intake and Derived Air Concentrations used in occupational radiation protection and thus may be applicable to regulatory situations. In addition these coefficients are applicable to environmental situations, although they are limited to the adult.

6. SOURCE and SCOPE of the DATA

The data library contains dose coefficients for intakes and external exposures to radionuclides as tabulated in Federal Guidance Reports 11 and 12. The dose coefficients for radionuclide intake (dose per unit activity inhaled or ingested) in FGR 11 were abstracted from the International Commission on Radiological Protection (ICRP) and the Oak Ridge National Laboratory (ORNL) dosimetric data files assembled during the preparation of Publication 30 of the International Commission on Radiological Protection. The dose coefficients for external exposure (dose per unit radionuclide concentration) in FGR 12 are based on new calculations of the radiation field for nuclides distributed in environment. Data are presented for 825 radionuclides. Tables 2.1 and 2.2 of FGR 11 and Tables III.1 through III.7 of FGR 12 are contained in the data library.

The external dose coefficients contained in the library are for submersion in contaminated air, immersion in contaminated water, and exposure to contaminated soil. The latter includes consideration of the radionuclides distributed (a) on the soil surface, (b) to depth 1 cm, (c) to a depth of 5 cm, (d) to a depth of 15 cm, and (e) to an infinite depth. These data, contained in Tables III.1 through III.7 of Federal Guidance Report 12, are based on new calculations of the energy and angular distribution of the photons on the body and their subsequent transport into the body. The organ dose coefficients for nuclides distributed on or in the soil were undertaken to properly account for the energy and angular distribution of the radiations on the body. Earlier tabulations often treated the radiation field from such source as being isotropic. The new tabulation also includes explicit consideration of bremsstrahlung. While the photon contribution to the organ dose is based on new Monte Carlo calculations, the skin dose from emitted electrons is based on the methods of Kocher (see DOE/EH-0070).

7. DISCUSSION of the DATA RETRIEVAL PROGRAM

The data retrieval program READEM illustrates the manner the dose coefficient files might be accessed by other software. The dose coefficient files are direct access files and an index file is provided which READEM searches to obtain the record number for the nuclide of interest in the dose coefficient files. The index file contains information regarding the half-life, decay mode, radioactive daughter products, etc. (see Appendix A of FGR 12 for additional details). Both READEM and CHAIN are written in Fortran and were compiled and linked using MS Fortran 5.0 to create the executables included in this package.

In the May 1995 update minor modifications were made to make the programs READEM and CHAIN more standard; and READEM was revised to correct an end-of-file error which occurred when trying to read inhalation data for M-258, the last nuclide in the index file. Notes were added on modifications necessary for use with the Lahey F77L/EM-32 compiler. Details are in the README.1ST file on diskette.

8. DATA FORMAT and COMPUTER

All files are direct-access ASCII files for use on IBM-compatible personal computers.

9. TYPICAL RUNNING TIME

Access to dose coefficients for a nuclide is negligible.

10. REFERENCES

a. Documentation available with library

K.F. Eckerman, A.B. Wolbarst, and A.C.B. Richardson, "Limiting Values of Radionuclide Intake and Air Concentration and Dose Conversion Factors for Inhalation, Submersion, and Ingestion," Federal Guidance Report No. 11, EPA-520/1-88-020 (September 1988).

K.F. Eckerman and J.C. Ryman, "External Exposure to Radionuclides in Air, Water, and Soil," Federal Guidance Report No. 12, EPA 402-R-93-081 (September 1993).

b. Other useful documentation

DOE (1988)." External Dose-Rate Conversion Factors for Calculation of Dose to the Public," DOE/EH-0070.

ICRP (1977). International Commission on Radiological Protection. "Recommendations of the International Commission on Radiological Protection," ICRP Publication 26, Annals of the ICRP Vol. 1, No. 3.

ICRP (1979). International Commission on Radiological Protection. "Limits for Intakes of Radionuclides by Workers," ICRP Publication 30, Annals of the ICRP Vol. 2, No. 3/4.

ICRP (1979). International Commission on Radiological Protection. "Radionuclide Transformations: Energy and Intensity of Emissions," ICRP Publication 38, Annals of the ICRP Vol. 11-13.

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

S.B. Watson and M.R. Ford (1980)."A User's Manual to the ICRP Code - A Series of Computer Programs to Perform Dosimetric Calculations for the ICRP Committee 2 Report," ORNL/TM-6980.

11. CONTENTS OF LIBRARY

Included are the referenced documents and 1 DS/HD (1.2MB) diskette which contain the data library Fortran retrieval code written in DOS compressed self-extracting files.

12. DATE OF ABSTRACT

January 1994, revised June 1995.