Thermoluminescence dating archaeology

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Measuring the intensity of the luminescence can determine how much time has passed since the last time the object was heated.The light is proportional to the amount of radiation absorbed since the material was last heated.Energy absorbed from ionizing radiation frees electrons to move through the crystal lattice, some of which are trapped at imperfections in the crystal lattice.Later, heating releases the trapped electrons, producing light.Instead, a less sophisticated method that would deceive TL testing is to reuse original broken and unmarketable pieces.Forgers commonly use the bottom of an original broken vessel, which has no commercial value, and make a new fake vessel on top of it.Thermoluminescence dating is generally not very accurate.

The last time a crystal was reheated and its electrons were released is known as a "clock resetting event".Create fake pottery that will pass the thermoluminescence test One way to pass a fake through a TL test is to expose the newly-made pottery to a high dose of artificial radiation sources, thus fooling the measurement instruments.However, producing fakes with this method calls for expertise on the subject, as well as expensive instruments.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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