calcium-45

noun

A radioactive isotope of calcium, 4520Ca, with 20 protons and 25 neutrons, and a half-life of 162.6 days; it is used as a tracer in studying calcium metabolism. As it decays it undergoes nuclear transmutation via electron emission, also called negative beta decay (β⁻-decay), into scandium.

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Meanings

nouncalcium-45 (uncountable)
  1. uncountablenatural sciencesA radioactive isotope of calcium, 4520Ca, with 20 protons and 25 neutrons, and a half-life of 162.6 days; it is used as a tracer in studying calcium metabolism. As it decays it undergoes nuclear transmutation via electron emission, also called negative beta decay (β⁻-decay), into scandium.
Cite this entry
APA

calcium-45. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/calcium-45

MLA

“calcium-45.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/calcium-45. Accessed November 3, 2026.

Chicago

WatkinsX Dictionary, s.v. “calcium-45,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/calcium-45.

Source: calcium-45 on Wiktionary, CC BY-SA 4.0.