**According to Dictionary.com, radioactive means of, pertaining to, exhibiting, or caused by radioactivity.** The term derives from the French "radio-actif," which was coined by Pierre and Marie Curie.

According to Encyclopædia Britannica, radioactivity is a property of certain kinds of matter involving the emission of energy and subatomic particles spontaneously. Unstable atomic nuclei decompose in order to reach a more stable state, thereby producing radioactive particles or electromagnetic radiation.

Half-life is the unit measurement for radioactive decay, where the time it takes for one-half of an element or isotope to decompose is determined. Half-lives range from fractions of a second to over a billion years.

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what does radioactive mean

ra·di·o·ac·tive

[rey-dee-oh-ak-tiv]

ADJECTIVE
[PHYSICS, CHEMISTRY]

1.

of, pertaining to, exhibiting, or caused by radioactivity.

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Dictionary.com

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