strontium 90

Definitions of strontium 90
  1. noun
    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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    type of:
    Sr, atomic number 38, strontium
    a soft silver-white or yellowish metallic element of the alkali metal group; turns yellow in air; occurs in celestite and strontianite
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