SECTION 4 TECHNICAL APPROACH — INTERNAL DOSE The technical approach used to estimate the organ-specific radiation dose commitments for the American military personnel exposed on Rongerik Atoll is based on the following data: Radionuclide inventory data for Shot Bravo calculated by Lawrence Livermore National Laboratory. Urinalysis data for the exposed Americans obtained by Los Alamos The basic approach used to calculate the dose commitments has four steps. > National Laboratory. The calculated radionuclide inventory provides the time-dependentrelative activity of the radionuclides present in the fallout. The inventory is normalized to the actual activity intake by relying on post-shot urinalysis to determine the amount of I-131 activity intake. The internal dose pathways are examined to determine that doses are highsided through use of large-particle inhalation dose conversion factors (rem/yCi), which are developed by modifying published ingestion dose conversion factors. Organ-specific dose commitments (rem) are calculated by combining the normalized activity inventory data with the large particle inhalation dose conversion factors. A description of each of the above steps is provided in the subsections below. 16