The TRMRI performs data collection of radiation affects on humans, including low dose irradiation. The Institute conducts research on the psychological consequences of radiation exposure, as well as the associated risks and societal costs. Aspects of the psychological affects of radiation exposure include the perceived risks, which needs to be quantified to fully understand the potential costs of a radiological disaster. We develop Probabilistic Risk Analysis (PRA) models of radiation therapy, and identify risk significant theraputic procedures to prevent medical radiation injuries.