Radioactivity meaning

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Spontaneous emission of radiation, either directly from unstable atomic nuclei or as a consequence of a nuclear reaction.
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Spontaneous emission of radiation, either directly from unstable atomic nuclei or as a consequence of a nuclear reaction.
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The radiation, including alpha particles, nucleons, electrons, and gamma rays, emitted by a radioactive substance.
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The radiation, including alpha particles, nucleons, electrons, and gamma rays, emitted by a radioactive substance.
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The emission of radiation by unstable atomic nuclei undergoing radioactive decay .
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Spontaneous emission of ionizing radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus.
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The radiation so emitted; including gamma rays, alpha particles, neutrons, electrons, positrons, etc.
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Origin of radioactivity