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Thermoluminescence (TL) dating is the determination, by means of measuring the accumulated radiation dose, of the time elapsed since material containing crystalline minerals was either heated (lava, ceramics) or exposed to sunlight (sediments).

As a crystalline material is heated during measurements the process of thermoluminescence starts.

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Thus, preliminary X-ray or gamma radiography examination of the object can increase the amount of accumulated energy and thus give erroneous dating result.The PDF file you selected should load here if your Web browser has a PDF reader plug-in installed (for example, a recent version of Adobe Acrobat Reader).If you would like more information about how to print, save, and work with PDFs, Highwire Press provides a helpful Frequently Asked Questions about PDFs.Different materials vary considerably in their suitability for the technique, depending on several factors.Subsequent irradiation, for example if an x-ray is taken, can affect accuracy, as will the "annual dose" of radiation a buried object has received from the surrounding soil.The emission of light when certain solids are warmed, generally to a temperature lower than that needed to provoke visible incandescence.