Of chronometric dating

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This causes them to give off their stored energy in the form of light impulses (photons). A similar effect can be brought about by stimulating the sample with infrared light.The intensity of thermoluminescence is directly related to the amount of accumulated changes produced by background radiation, which, in turn, varies with the age of the sample and the amount of trace radioactive elements it contains..In the example below, the bone must date to sometime between 1.75 and 1.5 million years ago.

When a sample is heated to high temperatures in a laboratory, the trapped electrons are released and return to their normal positions in their atoms.Since the magnetic field progressively changes with time in a predictable way Whenever possible, paleoanthropologists collect as many dating samples from an ancient human occupation site as possible and employ a variety of chronometric dating methods.In this way, the confidence level of the dating is significantly increased.It is also based on the fact that background radiation causes electrons to dislodge from their normal positions in atoms and become trapped in the crystalline lattice of the material.When odd numbers of electrons are separated, there is a measurable change in the magnetic field (or spin) of the atoms.

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