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ru•bid'i•um-stron'ti•um dat"ing

Pronunciation: (rOO-bid'ē-um-stron'shē-um, -shum, -tē-um), [key] Geol.
a radiometric dating method whereby the ratio of rubidium isotope to strontium in a mineral is used to calculate the age of the mineral, based on the rate of radioactive decay of rubidium to strontium.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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