| 单词 | potassium-argon dating |
| 释义 | potassium-argon dating[ puh-tas-ee-uhm-ahr-gon ] / pəˈtæs i əmˌɑr gɒn / noun Geology.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 of potassium-argon datingFirst recorded in 1965–70 Words nearby potassium-argon datingpotassium-40, potassium-42, potassium-43, potassium acetate, potassium antimonate, potassium-argon dating, potassium bicarbonate, potassium binoxalate, potassium bisulfate, potassium bitartrate, potassium bromate Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for potassium-argon datingpotassium-argon dating nouna technique for determining the age of minerals based on the occurrence in natural potassium of a small fixed amount of radioisotope 40 K that decays to the stable argon isotope 40 Ar with a half-life of 1.28 × 10 9 years. Measurement of the ratio of these isotopes thus gives the age of the mineralCompare 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 Scientific definitions for potassium-argon datingpotassium-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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