How does thermoluminescence dating work

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Thermoluminescence dating is very useful for determining the age of pottery. Electrons from quartz and other minerals in the pottery clay are bumped out of their normal positions ground state when the clay is exposed to radiation. This radiation may come from radioactive substances such as uraniumpresent in the clay or burial medium, or from cosmic radiation. The longer the exposure to the radiation, the more electrons that are bumped into an excited state, and the more light that is emitted upon heating.

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When a radiation is incident on a material, some of its energy may be absorbed and re-emitted as light of longer wavelength.

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Luminescence dating including thermoluminescence and optically stimulated luminescence is a type of dating methodology that measures the amount of light emitted from energy stored in certain rock types and derived soils to obtain an absolute date for a specific event that occurred in the past. The method is a direct dating techniquemeaning that the amount of energy emitted is a direct result of the event being measured. Better still, unlike radiocarbon datingthe effect luminescence dating measures increases with time.

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