Radiation epidemiology From: Contents Public Health England’s ( PHE’s) Centre for Radiation, Chemical and Environmental Hazards, manages and undertakes a programme of research to enable it to contribute to the understanding of the health risks of exposure to radiation. The radiation epidemiology programme involves work undertaken within PHE as well as vital collaborative work involving partnerships with national and international collaborators. National registry for radiation workers (NRRW) An epidemiological study established to examine the risks of protracted and low-dose exposures to ionising radiation among radiation workers in the UK.