The definition :
Definitions of strontium 90:
- 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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:atomic number 38 sr metal metallic element strontium 90 alkaline earth alkaline earth methal celestite red fire strontianite :cardinal ninety xc large integer
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