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| ra·di·o·ac·tive se·ries (plural ra·di·o·ac·tive se·rieses) |
noun |
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| Definition: |
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series of atom types: a series of related atom types nuclides of radioactive isotopes, each of which is transformed into the next by the emission of an elementary particle until a stable nuclide results. There are three such sequences, the thorium, the uranium-radium, and the actinium, and almost all naturally occurring radioactive isotopes belong to one of them.
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