Absolute dating of rocks and fossils
This technique is based on the principle that all objects absorb radiation from the environment.This process frees electrons within minerals that remain caught within the item.
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.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.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.
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