title: Low levels of ionising radiation may cause harm.
mesh_terms: D004307:Dose-Response Relationship, Radiation; D006801:Humans; D011829:Radiation Dosage; D011832:Radiation Injuries / Q000453:epidemiology*; D011839:Radiation, Ionizing; D018570:Risk Assessment; D012307:Risk Factors; D014481:United States / Q000453:epidemiology