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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.
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Word History and Origins
Origin of cobalt 601
First recorded in 1945–50
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Example Sentences
Nothing happened although the board showed the gauge's cobalt-60 beta and gamma still hot.
From Project Gutenberg
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