| background radiation |
The average person in the United States receives about 360 mrem of ionizing radiation every year. About 300 mrem per year comes from natural background radiation from outer space, soil and air that people breath, and about 60 mrem from man-made sources such as medical exposures to diagnostic rays and consumer products (eg, from smoking tobacco). The general worldwide contribution from radioactive fallout contamination is <0.3% of the average total dose. ...
출처: eed.llnl.gov/mi/glossary.php
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| background radiation |
Radiation is a part of our natural world. People have always been exposed to radiation that originates from within the Earth ("terrestrial" sources) and from outer space ("cosmogenic" or "galactic" sources).
출처: www.hps1.org/glossary/glossary.htm
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| 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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