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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
1950-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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Examples from the Web for strontium-90
Historical Examples
  • If this is true, strontium-90 may be contained in the deep currents and eventually will be brought again to the surface.

    Atoms, Nature, and Man Neal O. Hines
  • It was established that strontium-90 and cesium-137, important in fallout on land, enter the marine cycles only in minute amounts.

    Atoms, Nature, and Man Neal O. Hines
  • Experiments and fallout observations show that strontium-90 does not penetrate soils deeply.

    Atoms, Nature, and Man Neal O. Hines
  • Much attention has been devoted to strontium-90 and to its availability to man by deposit on plants and soils.

    Atoms, Nature, and Man Neal O. Hines
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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