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WordReference Random House Unabridged Dictionary of American English © 2024ru•bid′i•um-stron′ti•um dat′ing (ro̅o̅ bid′ē əm stron′shē əm, -shəm, -tē əm),USA pronunciation [Geol.]- Geologya 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.
Collins Concise English Dictionary © HarperCollins Publishers:: rubidium-strontium dating n - a technique for determining the age of minerals based on the occurrence in natural rubidium of a fixed amount of the radioisotope 87Rb which decays to the stable strontium isotope 87Sr with a half-life of 4.7 × 1011 years. Measurement of the ratio of these isotopes thus gives the age of a mineral, for ages of up to about 4 × 109 years
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