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22-Oct-2018 11:31

One of the most widely used is potassium–argon dating (K–Ar dating).Potassium-40 is a radioactive isotope of potassium that decays into argon-40.In historical geology, the primary methods of absolute dating involve using the radioactive decay of elements trapped in rocks or minerals, including isotope systems from very young (radiocarbon dating with Radiometric dating is based on the known and constant rate of decay of radioactive isotopes into their radiogenic daughter isotopes.

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This process frees electrons within minerals that remain caught within the item.

The relatively short half-life of carbon-14, 5,730 years, makes the reliable only up to about 50,000 years.