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
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Cobalt 60 is always a great word to know.
So is lye. Does it mean:
any of a number of polymers containing alternate silicon and oxygen atoms and that are fluid, resinous, rubbery, extremely stable in high temperatures, and water-repellent
a highly concentrated, aqueous solution of potassium hydroxide or sodium hydroxide, or any solution resulting from leaching or percolation
American Heritage
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
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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