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Also found in: Dictionary, Thesaurus, Legal, Encyclopedia, Wikipedia. Related to radiation sickness: radiation therapy, Chernobyl, Radiation exposure. a condition sometimes seen in patients who have received therapeutic doses of radiation. Its severity varies according to factors such as the individual's physical condition, the body areas exposed, and the amount, kind, and intensity of the exposure.
Wiktionary(0.00 / 0 votes)Rate this definition: background radiation(Noun) ionizing radiation that is naturally present in the environment. Freebase(0.00 / 0 votes)Rate this definition: Background radiation is the ubiquitous ionizing radiation that people on the planet Earth are exposed to, including natural and artificial sources. Both natural and artificial background radiation varies by location.