Science Dictionary
radiation  [%PREMIUM_LINK%]     (rā'dē-ā'shən)  Pronunciation Key 
    1. Streams of photons, electrons, small nuclei, or other particles. Radiation is given off by a wide variety of processes, such as thermal activity, nuclear reactions (as in fission), and by radioactive decay.

    2. The emission or movement of such particles through space or a medium, such as air. See Notes at conduction, electromagnetic radiation.

  1. The use of such energy, especially x-rays, in medical diagnosis and treatment.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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