background radiation

back·ground ra·di·a·tion

B b

Definitions of background radiation words

noun background radiation low-intensity radiation from, for example, small amounts of radioisotopes in soil, air, building materials, etc 3
noun background radiation low-intensity, multidimensional microwave radiation present in space: its existence is used to support the validity of the big-bang theory since it is thought to be a remnant of the original explosion 3
noun background radiation low levels of natural radiation existing on earth as a result of high-energy cosmic rays, the radioactive decay of rock, etc. 3
noun background radiation radiation in the environment 1
noun background radiation ionizing radiation that is naturally present in the environment. 0

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exclamation

A common word. It’s meaning is known to most children of preschool age. About 87% of English native speakers know the meaning and use the word.

Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".

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