DEFINE RADIOACTIVITY ?
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Radioactivity is the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
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The property possessed by some elements (such as uranium) of spontaneously emitting energy in the form of radiation as a result of the decay (or disintegration) of an unstable atom. Radioactivity is also the term used to describe the rate at which radioactive material emits radiation.
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