DLC-0167 ZZ-FGR-DOSE.

ZZ-FGR-DOSE.

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FORMAT: special format (direct access ASCII)

NUMBER OF GROUPS: --

NUCLIDES: contains dose coefficients (per unit activity inhaled or  ingested) for both intakes and external exposures to 825 radionucli- des as tabulated in Federal Guidance Reports 11 and 12. The external dose coefficients are for submersion in contaminated air, immersion  in contaminated water, and exposure to contaminated soil.

ORIGIN: DLC-80/DRALIST

WEIGHTING SPECTRUM: --

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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 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.

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, (c) to a depth of 15 cm, and (d) 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 (se DOE/EH-0070).

Access to dose coefficients for a nuclide is negligible.

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

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.

• 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)

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).

Contributed by: Radiation Safety Information Computational Center
                Oak Ridge National Laboratory
                Oak Ridge, Tennessee, U. S. A.

Developed by:   Oak Ridge National Laboratory, Oak Ridge,
                Tennessee, USA