radioactivity


ra·dio·ac·tiv·i·ty

noun \-ak-ˈtiv-ət-ē\
plural ra·dio·ac·tiv·i·ties

Definition of RADIOACTIVITY

: the property possessed by some elements (as uranium) or isotopes (as carbon 14) of spontaneously emitting energetic particles (as electrons or alpha particles) by the disintegration of their atomic nuclei

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