Background-radiation meaning

(astron.) 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.
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(physics) Low levels of natural radiation existing on earth as a result of high-energy cosmic rays, the radioactive decay of rock, etc.
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Ionizing radiation that is naturally present in the environment.
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