rubidium-strontium dating

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A method of dating geological specimens based on the decay of the radioisotope rubidium–87 into the stable isotope strontium–87. Natural rubidium contains 27.85% of rubidium–87, which has a half-life of 4.7 × M 1011 years. The ratio 87Rb/87Sr in a specimen gives an estimate of its age (up to several thousand million years).

Subjects: Earth Sciences and Geography.

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