radioactivity

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radioactivity

World Encyclopedia | 2005 | Â© World Encyclopedia 2005, originally published by Oxford University Press 2005. (Hide copyright information) Copyright

radioactivity Spontaneous change of the atomic nuclei of atoms, accompanied by the emission of radiation. The process by which a radioactive nucleus disintegrates is known as radioactive decay.

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radioactivity

A Dictionary of Nursing | 2008 | Â© A Dictionary of Nursing 2008, originally published by Oxford University Press 2008. (Hide copyright information) Copyright

radioactivity (ray-di-oh-ak-tiv-iti) n. disintegration of the nuclei of certain elements, with the emission of energy in the form of alpha, beta, or gamma rays. Naturally occurring radioactive elements include radium and uranium. See also radioisotope.
—radioactive adj.

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