Below, in the fifth of our series of videos explaining the sometimes tricky minutae of the EEOICPA claims process, Hugh outlines the Dose Reconstruction process used by the National Institute for Occupational Safety and Health (NIOSH) to determine the Probability of Causation (POC) in EEOICPA claims, or whether an atomic weapons worker’s illness(es) were at least as likely or not (50% or higher) caused by exposure to radiation and toxic chemicals while making atomic weapons for the Department of Energy (DOE).