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strontium 90

DEFINITIONS OF: strontium 90

1

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

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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