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TeachMeFinance.com - explain Radiation Radiation -- Transmission of energy though space or any medium. Also known as radiant energy. another definition... (ray-dee-AY-shun) Energy released in the form of particles or electromagnetic waves. Common sources of radiation include radon gas, cosmic rays from outer space, and medical x-rays. another definition... The transfer of heat through matter or space by means of electromagnetic waves. another definition... a term with two broad meanings. In the narrow sense, some type of electromagnetic wave: radio, microwave, light (infra-red, visible or ultra-violet), x-rays or gamma rays are all types of radiation. Colloquially (the full term is "ionizing radiation") it means any spreading emission which can penetrate matter. That includes x-rays and gamma rays, but also high-energy ions and electrons emitted by radioactive substances, accelerated by laboratory devices or encountered in space (e.g. the "radiation belt" and "cosmic radiation"). another definition... Energy transport through electromagnetic waves. See shortwave radiation and longwave radiation. Copyright © 2005 by Mark McCracken, All Rights Reserved. TeachMeFinance.com is an informational website, and should not be used as a substitute for professional medical, legal or financial advice. Information presented at TeachMeFinance.com is provided on an "AS-IS" basis. Please read the disclaimer for details.