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Absolute dating techniques attempt to pinpoint a discrete, known interval in time such as a day, year, century, or millennia.

Very few artifacts recovered from an archeological site can be absolutely dated.

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Since the 1960s, scientists have started accounting for the variations by calibrating the clock against the known ages of tree rings.When the organism dies, the carbon 14 (C14) atoms disintegrate at a known rate, with a half-life of 5,700 years.It is possible then to calculate the date of an organic object by measuring the amount of C14 left in the sample.Archeologists use several methods to establish absolute chronology including radiocarbon dating, obsidian hydration, thermoluminescence, dendrochronology, historical records, mean ceramic dating, and pipe stem dating.Each of these methods is explained in this section.

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