cobalt 60

cobalt 60

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.

Origin:
1945–50

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Cultural Dictionary
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.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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