title: Symposium: extrapolation to low doses of ionizing radiation. I. Introduction.
mesh_terms: D000059:Accidents; D004781:Environmental Exposure; D005720:Gamma Rays; D006801:Humans; D008954:Models, Biological; D009688:Nuclear Reactors; D011210:Power Plants; D011639:Public Opinion; D011640:Public Policy; D011829:Radiation Dosage; D011832:Radiation Injuries / Q000209:etiology*; D012306:Risk