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terrestrial radiation

noun
1.
long-wave electromagnetic radiation in the form of heat emitted from the earth's surface and atmosphere.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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terrestrial-radiation in Science
terrestrial radiation  
Long-wave electromagnetic radiation originating from Earth and its atmosphere. It is the radiation emitted by naturally radioactive materials on Earth including uranium, thorium, and radon.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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