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potassium-argon dating

[puh-tas-ee-uh m-ahr-gon] /pəˈtæs i əmˌɑr gɒn/
noun, Geology
1.
a method for estimating the age of a mineral or rock, based on measurement of the rate of decay of radioactive potassium into argon.
Origin
1965-1970
1965-70
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for potassium-argon dating

potassium-argon dating

noun
1.
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 1.28 × 109 years. Measurement of the ratio of these isotopes thus gives the age of the mineral Compare radiocarbon dating, rubidium-strontium dating
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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potassium-argon dating in Science
potassium-argon dating  
A method of radiometric dating, involving analysis of the ratio of potassium 40 (a radioactive isotope of potassium) to argon (the product of radioactive decay of potassium 40) in a given sample.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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13
16
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