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Indeed, the figure shows an automatic instrumentation which allows measurement of thermoluminescence light from samples and also the determination of the dose rate per year.This last procedure involves the use of a radioactive source, though very weak.When the object is heated to 350 degrees Celsius the trapped electrons are released and this is called a clock resetting event.From this time on, electrons start to build up again because of the natural radioactivity. Unfortunately there are no affordable direct methods for dating pigments, except in some cases as we will see later.Generally, for example, we can’t establish when a vermilion stroke was brushed onto a painting, but we can date most of the materials that the pigments are painted on.

Later, heating releases the trapped electrons, producing light.When the sample is heated in the lab, it releases thermoluminescence light.The intensity of the thermoluminescence light is proportional to the time that has passed from the last clock resetting event, which for ceramics correspond to when it was baked.Natural radioactivity causes latent thermoluminescence to build up so the older an object is, the more light is produced.Therefore, thermoluminescence dating is actually determining the last time a crystal was heated and electrons were released.This usually occurs when the items are heated to 350 degrees Celsius.Therefore, in archaeology, thermoluminescence dating works best for ceramics, cooking hearths, incidentally fire-cracked rocks, and deliberately fire-treated rocks, such as flint or chert.The minerals that are used for thermoluminescence dating are mainly quartz and feldspar.The last time a crystal was reheated and its electrons were released is known as a "clock resetting event".The TL operator generally takes samples for dating from the bottom, avoiding damage to the image of the artwork.TL is based on the fact that almost all natural minerals are thermoluminescent.

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