radiobiology study type epidemiological study https://www.cdc.gov/csels/dsepd/ss1978/lesson1/section1.html An epidemiological study is the study (scientific, systematic, and data-driven) of the distribution (frequency, pattern) and determinants (causes, risk factors) of health-related states and events (not just diseases) in specified populations (neighborhood, school, city, state, country, global)