The Online Encyclopedia and Dictionary







Radiation generally means the transmission of waves, objects or information from a source into a surrounding medium or destination.

Within physics, related concepts are:

In Biology, adaptive radiation is a process in evolutionary biology by which one species becomes many in order to adapt to specific ecological niches.

Radiation is sometimes also used, inaccurately, to refer to radioactive contamination, the release of radioactive isotopes into the environment. These isotopes then release ionizing radiation, which can be especially severe if the isotopes have been taken up by plants, animals or humans, since the isotopes then release their ionizing radiation from inside the organism.

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