radiometric-dating

radiometric dating

noun
any 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:
1965–70

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Collins
World English Dictionary
radiometric dating
 
n
Also called: radioactive dating any method of dating material based on the decay of its constituent radioactive atoms, such as potassium-argon dating or rubidium-strontium dating

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
radiometric dating   (rā'dē-ō-mět'rĭk)  Pronunciation Key 
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.
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