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noun, Chemistry.
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.


Read Also:

  • Strontium-hydroxide

    noun, Chemistry. 1. a white, slightly water-soluble powder, Sr(OH) 2 , or its crystalline octahydrate (strontium hydrate) used chiefly in the refining of beet sugar.

  • Strontium monoxide

    noun 1. a white insoluble solid substance used in making strontium salts and purifying sugar. Formula: SrO Also called strontium oxide, strontia

  • Strontium unit

    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

  • Strook

    verb, Scot. and North England. 1. a simple past tense and past participle of strike. verb (used with object), struck or (Obsolete) strook; struck or especially for 31–34, stricken or (Obsolete) strook; striking. 1. to deal a blow or stroke to (a person or thing), as with the fist, a weapon, or a hammer; hit. […]

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