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It is possible, particularly in dry, desert climates, for organic materials such as from dead trees to remain in their natural state for hundreds of years before people use them as firewood or building materials, after which they become part of the archaeological record.Thus dating that particular tree does not necessarily indicate when the fire burned or the structure was built.Other radiometric dating techniques are available for earlier periods.One of the most widely used is potassium–argon dating (K–Ar dating).For this reason, many archaeologists prefer to use samples from short-lived plants for radiocarbon dating.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.Potassium-40 is a radioactive isotope of potassium that decays into argon-40.

For example, techniques based on isotopes with half lives in the thousands of years, such as Carbon-14, cannot be used to date materials that have ages on the order of billions of years, as the detectable amounts of the radioactive atoms and their decayed daughter isotopes will be too small to measure within the uncertainty of the instruments.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.This process frees electrons within minerals that remain caught within the item.Heating an item to 500 degrees Celsius or higher releases the trapped electrons, producing light.




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