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strontium 90

noun, Chemistry.
a harmful radioactive isotope of strontium, produced in certain nuclear reactions and present in their fallout.
Also called radiostrontium.
Origin of strontium 90
First recorded in 1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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strontium 90 in Science
strontium 90  
A radioactive isotope of strontium having a mass number of 90 and a half-life of 28 years. Strontium 90 is the most dangerous component of the fallout from nuclear explosions because it is easily absorbed by the body. It is also used in medicine to treat cancer.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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