e/Commonly-used gamma emitting isotopes

Information
has gloss	eng: Caesium-137 is one such radionuclide. It has a half-life of 30 years, and decays by pure beta decay to a metastable state of barium-137 (Ba-137m). Barium-137m has a half-life of minutes and is responsible for all of the gamma ray emission. The ground state of barium-137 is stable.
lexicalization	eng: Commonly used gamma emitting isotopes
lexicalization	eng: Commonly-used gamma emitting isotopes
instance of	(noun) one of two or more atoms with the same atomic number but with different numbers of neutrons isotope