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These crystalline solids are constantly subjected to ionizing radiation from their environment, which causes some energized electrons to become trapped in defects in the molecular crystal structure.An input of energy, such as heat, is required to free these trapped electrons.Luminescence dating is particularly appropriate when radiocarbon dating is not possible (either where no suitable material is available or for ages beyond the radiocarbon age limit) or for applications affected by radiocarbon plateau effects (e.g.

On heating, some of this energy is emitted as visible light.

By comparing this light output with that produced by known doses of radiation, the amount of radiation absorbed by the material may be found.

Most mineral materials, including the constituents of pottery, have the property of thermoluminescence (TL), where part of the energy from radioactive decay in and around the mineral is stored (in the form of trapped electrons) and later released as light upon strong heating (as the electrons are detrapped and combine with lattice ions).

The older the pottery, the more radiation it has absorbed and the brighter the pottery sample glows.

By measuring the TL, we can calculate how much radiation has been absorbed and use this information to calculate the approximate age of the pottery.