Carbon dating absolute dating
The technique hinges on carbon-14, a radioactive isotope of the element that, unlike other more stable forms of carbon, decays away at a steady rate.
Organisms capture a certain amount of carbon-14 from the atmosphere when they are alive.
As explained below, the radiocarbon date tells us when the organism was alive (not when the material was used).
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But even he “realized that there probably would be variation”, says Christopher Bronk Ramsey, a geochronologist at the University of Oxford, UK, who led the latest work, published today in Science.
Relative dating and radiometric dating are used to determine age of fossils and geologic features, but with different methods.
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