Strontium-90
noun, Chemistry.
1.
a harmful radioactive isotope of strontium, produced in certain nuclear reactions and present in their fallout.
strontium 90
A radioactive isotope of strontium having a mass number of 90 and a half-life of 28 years. Strontium 90 is the most dangerous component of the fallout from nuclear explosions because it is easily absorbed by the body. It is also used in medicine to treat cancer.
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noun 1. a unit expressing the concentration of strontium-90 in an organic medium, such as soil, milk, bone, etc, relative to the concentration of calcium in the same medium SU
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