is a senior scientist at Oak Ridge Center for Risk Analysis, Oak Ridge, Tennessee and an adjunct professor in the Nuclear Engineering Department at University of Tennessee. He has more than 30 y of experience in radiological dose and risk assessment, and contributed to projects for different national and international organizations and agencies including National Institute of Occupational Safety and Health (NIOSH), National Cancer Institute (NCI), NCRP, U.S. Environmental Protection Agency, National Aeronautics and Space Administration (NASA), International Commission on Radiological Protection (ICRP), International Atomic Energy Agency, and United Nations Scientific Committee on Effects of Atomic Radiation. He is a co-author on NCRP Report No. 164 and ICRP Publication 150.

Dr. Apostoaei participated in numerous retrospective and prospective dose and risk assessment studies of (1) individuals exposed to historic releases of radionuclides from Oak Ridge Reservation in Tennessee, Hanford Site in Washington, and Idaho National Engineering Laboratory in Idaho, (2) members of public exposed to nuclear weapons fallout in the United States and the Marshall Islands, or (3) astronauts exposed to space radiation. He performed reviews of scientific information on various topics related to radiation dose assessment models and dose-response analyses in epidemiological studies.

External and internal dosimetry are areas of key interest for him. He participated in the development of an Internal Dose Estimation computer software Package (InDEP) to analyze bioassay data and calculate organ doses in workers exposed to plutonium and uranium by inhalation or ingestion, and of a new Fluoroscopy X-rays Organ-Specific Dosimetry System (FLUXOR) for historic exposures of patients to chest fluoroscopies. He also specializes in evaluation of various types of radiological risk (e.g., lifetime risk, probability of causation, years of life lost), and he contributed to the design, building and maintenance of several known radiation risk assessment tools, including NCI/NIOSH Interactive Radio-Epidemiological Program, NCI’s Radiation Risk Assessment Tool (BEIR VII/RadRAT), or NASA’s Risk Assessment Environment. He has extensive expertise in methods for propagation and analysis of uncertainties.