background radiation definition by Webster's New World
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- Astron. low-intensity, multidimensional microwave radiation present in space: its existence is used to support the validity of the big-bang theory since it is thought to be a remnant of the original explosion
- Physics low levels of natural radiation existing on earth as a result of high-energy cosmic rays, the radioactive decay of rock, etc.
background radiation - Cultural Definition
The New Dictionary of Cultural Literacy Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
background radiation - Medical Definition
Relatively constant low-level radiation from environmental sources such as building materials, cosmic rays, and ingested radionucleides in the body.