| 单词 | radiometric dating |
| 释义 | radiometric datingSEE SYNONYMS FOR radiometric dating ON THESAURUS.COM nounany method of determining the age of earth materials or objects of organic origin based on measurement of either short-lived radioactive elements or the amount of a long-lived radioactive element plus its decay product. Also called radioactive dating. Origin of radiometric datingFirst recorded in 1965–70 Words nearby radiometric datingradioluminescence, radiolysis, radioman, radiometeorograph, radiometer, radiometric dating, radiomicrometer, radio microphone, radiomimetic, radionecrosis, radioneuritis Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for radiometric datingradiometric dating nounany method of dating material based on the decay of its constituent radioactive atoms, such as potassium-argon dating or rubidium-strontium datingAlso called: radioactive 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 radiometric datingradiometric dating [ rā′dē-ō-mĕt′rĭk ] A method for determining the age of an object based on the concentration of a particular radioactive isotope contained within it. For inorganic materials, such as rocks containing the radioactive isotope rubidium, the amount of the isotope in the object is compared to the amount of the isotope's decay products (in this case strontium). The object's approximate age can then be figured out using the known rate of decay of the isotope. For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms. Radiocarbon dating is one such type of radiometric dating. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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