Meaning of cobalt 60

cobalt 60

Pronunciation: [key]
— Chem. Chem.
  1. a radioactive isotope of cobalt having a mass number of 60 and a half-life of 5.2 years, used chiefly in radiotherapy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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