单词 | rubidium-strontium dating |
释义 | rubidium-strontium datingnoun a technique for determining the age of minerals based on the occurrence in natural rubidium of a fixed amount of the radioisotope87Rb which decays to the stable strontium isotope87Sr 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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