Usually means: Radioactive isotope used in research.
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We found 4 dictionaries that define the word calcium-45:

General (2 matching dictionaries)
  1. calcium-45: Wiktionary
  2. calcium-45: Dictionary.com

Computing (1 matching dictionary)
  1. calcium-45: Encyclopedia

Medicine (1 matching dictionary)
  1. online medical dictionary (No longer online)

Definitions from Wiktionary (calcium-45)

noun:  (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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