rubidiumstrontium dating

rubidium-strontium dating

[roo-bid-ee-uhm-stron-shee-uhm, -shuhm, -tee-uhm]
noun Geology.
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.

Origin:
1965–70

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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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