strontium 90

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strontium 90


n.
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 can be absorbed by the body. It is also used in medicine to treat cancer.
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Noun1.strontium 90 - 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
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