strontium 90

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stron·ti·um 90 (90Sr),

(stron'shē-ŭm),
A radioactive strontium isotope; a β emitter with a half-life of 29.1 years; a major component (about 5%) of the uranium fission products; it is incorporated into bone tissue where turnover is slow; used to treat some ocular conditions (for example, pterygia).

strontium 90

A radioactive isotope of 28 years half-life that is produced in large quantities in nuclear fission reactions. It accumulates in the bones and may cause leukaemia and bone tumours.