background radiation

[ băkground′ ]

n.

Relatively constant low-level radiation from environmental sources such as building materials, cosmic rays, and ingested radionucleides in the body.

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Cultural definitions for background radiation

background radiation

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 New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.