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strontium 90

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noun Chemistry.

a harmful radioactive isotope of strontium, produced in certain nuclear reactions and present in their fallout.

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Also called radiostrontium.

Origin of strontium 90

First recorded in 1950–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

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Scientific definitions for strontium 90

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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