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cobalt 60

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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.

Origin:
1945–50
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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cobalt 60  
n.  A radioactive isotope of cobalt with mass number 60 and exceptionally intense gamma-ray activity, used in radiotherapy, metallurgy, and materials testing.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: cobalt 60
Pronunciation: -'sik-stE
Function: noun
: a heavy radioactive isotope of cobalt having the mass number 60 produced in nuclear reactorsand used as a source of gamma rays especially in place of radium (as in the treatment of cancer and in radiography) called also radiocobalt
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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