cobalt 60: Meaning and Definition of

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.