Background Radiation

Main Entry:  background radiation
Part of Speech:  n
Definition:  See cosmic background radiation
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American Heritage
Medical Dictionary

background radiation back·ground radiation (bāk'ground')
n.
Relatively constant low-level radiation from environmental sources such as building materials, cosmic rays, and ingested radionucleides in the body.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Cultural Dictionary

background radiation definition


Low-level radiation at the surface of the Earth that comes from cosmic rays and from small amounts of radioactive materials in rocks and the atmosphere.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Copyright © 2014 Dictionary.com, LLC. All rights reserved.
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