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strontium 90

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

Origin of strontium 90

First recorded in 1950–55
Also called radiostrontium.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for strontium 90

Historical Examples

  • 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

  • Much attention has been devoted to strontium-90 and to its availability to man by deposit on plants and soils.

  • Experiments and fallout observations show that strontium-90 does not penetrate soils deeply.

  • If this is true, strontium-90 may be contained in the deep currents and eventually will be brought again to the surface.


strontium 90 in Science

strontium 90

  1. 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.