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.

cobalt 60

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

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

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First recorded in 1945–50

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Examples have not been reviewed.

To run the experiment she had in mind, Wu needed to reduce the temperature of radioactive cobalt 60 nuclei until the particles almost stopped moving.

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Given all that, replacing cobalt 60 machines does not always go well.

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The cobalt 60 was found several hundred feet from the truck, apparently carried off by the thieves or by curious people in the area.

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After a two-day hunt, a stolen truck containing the lethal radioactive material cobalt 60 was found in the rural Mexican town of Hueypoxtla.

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At the time of the theft, the agency said, the cobalt 60 had been properly shielded from exposure.

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