Background Radiation Definition

noun
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.
Webster's New World
Low levels of natural radiation existing on earth as a result of high-energy cosmic rays, the radioactive decay of rock, etc.
Webster's New World
Ionizing radiation that is naturally present in the environment.
Wiktionary
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Other Word Forms of Background Radiation

Noun

Singular:
background radiation
Plural:
background-radiations
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