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Absolute dating is the process of determining an age on a specified chronology in archaeology and geology.

Other radiometric dating techniques are available for earlier periods.

One of the most widely used is potassium–argon dating (K–Ar dating).

The technique often cannot pinpoint the date of an archeological site better than historic records, but is highly effective for precise dates when calibrated with other dating techniques such as tree-ring dating.

An additional problem with carbon-14 dates from archeological sites is known as the "old wood" problem.

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Cosmic radiation entering the earth’s atmosphere produces carbon-14, and plants take in carbon-14 as they fix carbon dioxide.

Carbon-14 moves up the food chain as animals eat plants and as predators eat other animals. It takes 5,730 years for half the carbon-14 to change to nitrogen; this is the half-life of carbon-14.

After another 5,730 years only one-quarter of the original carbon-14 will remain.

After yet another 5,730 years only one-eighth will be left.

The date measured reveals the last time that the object was heated past the closure temperature at which the trapped argon can escape the lattice.



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