noun, Chemistry.
a radioactive isotope of cobalt having a mass number of 60 and a half-life of 5.2 years, used chiefly in radiotherapy.
cobalt 60 [(koh-bawlt)]

A radioactive isotope produced when neutrons bombard atoms of the element cobalt.

Note: Cobalt 60 is a common substance used in radiation therapy for cancer.


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  • Cobaltammine

    [koh-bawlt-am-een, -uh-meen] /ˌkoʊ bɔltˈæm in, -əˈmin/ noun 1. any of the various complex derivatives of cobalt containing one or more molecules of ammonia bonded to the cobalt.

  • Cobalt-bloom

    noun, Mineralogy. 1. (def 1) noun 1. another name for erythrite (sense 1)

  • Cobalt-blue

    noun 1. a deep blue to a strong greenish-blue color. 2. any of a number of pigments containing an oxide of cobalt. noun 1. Also called Thénard’s blue. any greenish-blue pigment containing cobalt aluminate, usually made by heating cobaltous sulphate, aluminium oxide, and phosphoric acid together 2.

  • Cobalt bomb

    noun 1. a cobalt-60 device used in radiotherapy 2. a nuclear weapon consisting of a hydrogen bomb encased in cobalt, which releases large quantities of radioactive cobalt-60 into the atmosphere

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