strontium 90

Noun
  1. 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 (synset 114680180)
    is a type of: atomic number 38, sr, 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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