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The accuracy of the linearity in heating sample is crucial to have a precise measure.The result of this measure is, as described above, a glow curve.Because this accumulation of trapped electrons begins with the formation of the crystal structure, thermoluminescence can date crystalline materials to their date of formation; for ceramics, this is the moment they are fired.The major source of error in establishing dates from thermoluminescence is a consequence of inaccurate measurements of the radiation acting on a specimen.A non-negligible part of materials which ceramic is usually made of (like quartz and feldspars) is thermoluminescent: those materials have trap states that can capture electrons after interaction with alfa, beta and gamma rays existing in nature.When these materials are heated to several hundreds of Centigrade degrees, electrons are evicted from trap states and energy is emitted in form of light: thermoluminescence (TL).Internal dose rate consists of three parameters related to the α, β and γ radiation, where the latter is usually small in most cases.External dose rate sediment contains not only the flint samples, but radioactive nuclides as well.

The result is a glow curve showing the photon emission in function of the heating temperature: If the specimen’s sensitivity to ionizing radiation is known, as is the annual influx of radiation experienced by the specimen, the released thermoluminescence can be translated into a specific amount of time since the formation of the crystal structure.Three different types of glow curve can be distinguished: • The natural thermoluminescence of the sample as it is • The additive glow curve where a radiation does with a calibrate radioactive source is given in addition to the natural one • The regenerate signal, when the sample has been zeroed its natural TL by heating and then given an artificial radiation dose The last two glow curves allow to measure the sensitivity of a sample to natural radiations and are used to determine the paleodose.There are several ways to determine the paleodose comparing the results of the different glow curves measured.The wavelength of the emitted light is characteristic of the luminescent substance and not of the incident radiation.Thermoluminescence (TL) is the process in which a mineral emits light while it is being heated: it is a stimulated emission process occurring when the thermally excited emission of light follows the previous absorption of energy from radiation.

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