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background radiation
environ.	promieniowanie naturalne
health.	promieniowanie tła
radiol.	tło promieniowania
background radiation Radiation resulting from natural sources, as opposed to man-made sources, and to which people are exposed in everyday, normal life; for example from rocks and soil
environ.	poziom promieniowania (promieniowanie pochodzące ze źródeł naturalnych)
English thesaurus
background radiation
mil., logist.	Nuclear or ionizing radiations arising from within the body itself or from the environment to which individuals are constantly exposed. (FRA)