radiation

Definition / meaning of radiation

Energy released in the form of particle or electromagnetic waves. Common sources of radiation include radon gas, cosmic rays from outer space, medical x-rays, and energy given off by a radioisotope (unstable form of a chemical element that releases radiation as it breaks down and becomes more stable).

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Find More About 'radiation'

Source(s):

The Web site of the National Cancer Institute (http://www.cancer.gov/)

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