Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The strontium isotope with mass 90, having a half-life of 28 years, used for its high-energy beta emission in certain nuclear electric power sources and constituting a radiation hazard in fallout.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones

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