Definition of Radioactivity

This is the warning symbol for radioactivity.
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Radioactivity Definition: Radioactivity is the spontaneous emission of radiation in the form of particles or high energy photons resulting from a nuclear reaction.

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Helmenstine, Anne Marie, Ph.D. "Definition of Radioactivity." ThoughtCo, Feb. 7, 2017, thoughtco.com/definition-of-radioactivity-606338. Helmenstine, Anne Marie, Ph.D. (2017, February 7). Definition of Radioactivity. Retrieved from https://www.thoughtco.com/definition-of-radioactivity-606338 Helmenstine, Anne Marie, Ph.D. "Definition of Radioactivity." ThoughtCo. https://www.thoughtco.com/definition-of-radioactivity-606338 (accessed May 21, 2018).