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background radiation

   Also found in: Dictionary/thesaurus, Medical, Wikipedia, Hutchinson 0.01 sec.
background radiation [′bak‚grau̇nd ‚rād·ē′ā·shən]
(nucleonics)
The radiation in humans' natural environment, including cosmic rays and radiation from the naturally radioactive elements. Also known as natural radiation.
(physics)
Radiation which is due to sources other than the source of interest in a measurement of radiation and which is detected by the measuring apparatus.


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And it just so happens that 1965 was also the year of the discovery of cosmic background radiation, the first physical evidence of the big bang, which made front-page news.
This is a delayed coincidence experiment, so only accidental coincidences from background radiation will appear as background events in the data.
The average annual effective dose from natural background radiation in the United States is estimated to be approximately 3 mSv (300 mrem) [Committee on the Biological Effects of Ionizing Radiation (BEIR V) 1990].
 
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