Definitions for background radiation
radiation coming from sources other than those being observed
ionizing radiation that is naturally present in the environment.
U.S. National Library of Medicine
Radiation from sources other than the source of interest. It is due to cosmic rays and natural radioactivity in the environment.
Dictionary of Military and Associated Terms
Nuclear (or ionizing) radiations arising from within the body and from the surroundings to which individuals are always exposed.
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