potassium-argon dating definition, potassium-argon dating meaning | English dictionary

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potassium-argon dating


      n   a technique for determining the age of minerals based on the occurrence in natural potassium of a small fixed amount of radioisotope 40K that decays to the stable argon isotope 40Ar with a half-life of 1.28x109 years. Measurement of the ratio of these isotopes thus gives the age of the mineral  
   Compare       radiocarbon dating       rubidium-strontium dating  
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