(Dr. Nolan Hertel, advisor)
"Calculation of Internal Dose Conversion Factors for Selected Spallation Products"
In 1988, the Environmental Protection Agency (EPA) published internal dose conversion factors (DCFs) for the inhalation and ingestion of approximately 800 radionuclides of interest to the nuclear community, principally for fission-based facilities. The above reference, Federal Guidance Report (FGR) #11, does not have DCFs for radioisotopes that may be produced at spallation neutron source facilities. This thesis addresses the methodology to calculate DCFs for radioisotopes not listed in current regulatory guides. Several preprocessing codes were written using C++, which reformat processed nuclear data from the Evaluated Nuclear Structure Data File (ENSDF) into large data files for direct input to the Oak Ridge National Laboratory (ORNL) code Dose Calculation (DCAL). This method may be applied to any radionuclide for which biokinetic models exist, including those already listed in FGR #11, as updated nuclear data are available. DCFs have been calculated for 84 radionuclides not currently listed in FGR # 11.