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Meaning of strontium 90

stron•ti•um

Pronunciation: (stron'shē-um, -shum, -tē-um), [key]
— n. Chem.
  1. a bivalent, metallic element whose compounds resemble those of calcium, found in nature only in the combined state, as in strontianite: used in fireworks, flares, and tracer bullets. Symbol: Sr; at. wt.: 87.62; at. no.: 38; sp. gr.: 2.6.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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