| background radiation |
The background radiation of the universe is the temperature of the extragalactic medium in a non-expanding universe. It has been measured at 2.7 degrees Kelvin with a variation of only 1 in 100,000.
출처: www.eaas.co.uk/news/astronomical_terms.html
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| background radiation |
Radiation (at a typical rate of 60-100 mrem per year) coming from space or from the earth. It can be both natural and man-made.
출처: www.ratical.org/radiation/SecretFallout/Glossary.h...
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| background radiation |
the ionizing radiation dose from naturally occurring sources: cosmic rays (gamma rays from outer space), about 30 millirems/year; and radioactive isotopes in the earth's crust, primarily uranium, thorium, radium and potassium, about 30 millirems/year; for an external total dose of about 60 millirems/yr; in addition there is an internal dose from ingestion and inhalation of these naturally occurring radioactive isotopes of about 40 millirems/yr; making for a grand total of about 100 millirems ...
출처: www.factsofwny.com/glossary.htm
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