Cobalt-60 is an important radioactive source and China National Nuclear Corporation is the only domestic manufacturer.

cobalt-60, with the nuclide symbol 60co, is one of the isotopes of the metallic element cobalt. the isotopes of cobalt include cobalt-56, cobalt-57, cobalt-58, cobalt-59, and cobalt-60. among them, only cobalt-59 is non-radioactive and exists stably in nature. the other several are radioactive and need to be synthesized. as a radioactive isotope of cobalt, cobalt-60…