calcium-45

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Noun

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calcium-45 (uncountable)

  1. (physics) A radioactive isotope of calcium, 4520Ca, having twenty protons and twenty-five neutrons, and a half-life of 162.6 days; it is used as a tracer in studying calcium metabolism. As it decays it undergoes transformation (nuclear transmutation) via electron emission, also called negative beta decay (β−-decay), into scandium.
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