radiation coming from sources other than those being observed
ionizing radiation that is naturally present in the environment.
Background radiation is the ubiquitous ionizing radiation that people on the planet Earth are exposed to, including natural and artificial sources. Both natural and artificial background radiation varies by location.
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.
The numerical value of background radiation in Chaldean Numerology is: 7
The numerical value of background radiation in Pythagorean Numerology is: 7
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"background radiation." Definitions.net. STANDS4 LLC, 2017. Web. 17 Dec. 2017. <http://www.definitions.net/definition/background radiation>.