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Evaluation of environmental measurements and calculations for site profiles.
Health Phys 2003 Jun; 84(Suppl):S223-S224
Environmental profiles have been developed for DOE sites for use by dose reconstructors to evaluate the contribution of ambient site background to a energy employee's occupational dose. Site annual environmental reports have been reviewed for data that would be useful in reconstructing ambient radiation levels and airborne radionuclide concentrations. Data in these historical documents included ambient pressurized ion chamber and TLD radiation measurements, air sampling results, and residual soil activity. The historical ion chamber and TLD results with uncertainty estimates, where available, were tabulated and are located in the Technical Basis Document. Environmental dose estimates to workers, including background radiation, ranged from 0.05 cSv to 0.8 cSv y.l for the Savannah River Site. Careful review of the air sampling data deemed it to be of limited value due to confounding effects of above ground nuclear testing, limited spatial and radionuclide resolution, and insensitivity of early sampling techniques for radionuclides of interest. Therefore, methods were developed to use well documented source terms developed by previous studies, coupled with historical meteorology, to estimate, radionuclide-specific airborne concentrations for 3H, 131I, 41Ar, 238/239/240Pu, and 234/235/238U. Air concentration calculations included spatial and release height considerations for source terms from two separations and five reactor areas at the Savannah River Site. The 50th and 95th percentile air concentrations were estimated for these source term areas as well as other populated areas. The utilization of residual soil activities has also been implemented in the Technical Basis Document.
Nuclear-energy; Employee-exposure; Exposure-assessment; Environmental-factors; Dose-response; Occupational-exposure; Airborne-particles; Radiant-energy; Radiation-exposure; Radiation-facilities; Radiation-measurement; Radionuclides; Ionizing-radiation; Meteorology; Air-sampling; Soil-analysis
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Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division