Definition of "cobalt 60" []

• A radioactive isotope of cobalt with mass number 60 and exceptionally intense gamma-ray activity, used in radiotherapy, metallurgy, and materials testing. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "We share his altered vision as the Treatment Room is filled with a brilliant violet radiation, centering on the cobalt 60 machine's lens but arcing and pulsing in wild geometries as the radiation leaps from the machine to Jack."
• "Louis has been wheeled into the Radiology Control Room in a wheelchair but now he stands to peer through a thick window into the Treatment Room where Jack Winters lies on the treatment couch under the overhanging eye of a massive supervoltage cobalt 60 machine."