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30-May-2017 11:03

This is a radiometric technique since it is based on radioactive decay.

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

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Thus dating that particular tree does not necessarily indicate when the fire burned or the structure was built.

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Thermoluminescence testing also dates items to the last time they were heated.The development of accelerator mass spectrometry (AMS) dating, which allows a date to be obtained from a very small sample, has been very useful in this regard.Other radiometric dating techniques are available for earlier periods.Techniques include tree rings in timbers, radiocarbon dating of wood or bones, and trapped-charge dating methods such as thermoluminescence dating of glazed ceramics.



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