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background radiation
dermat.	本底放射
geophys.	背景辐射
mol.gen.	本底照射
space	本底［背景］辐射
wind.	本底辐射
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.	背景辐射 (来自于自然界的辐射而非来自于人为来源的辐射，正常情况下人们每日都暴露于此辐射下，例如来自于岩石和土壤。)
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)

background radiation: 23 phrases in 8 subjects

Aviation	2
Chemistry	1
Metallurgy	1
Nuclear and fusion power	1
Remote sensing	1
Space	4
Technology	12
United States	1