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- Thermoluminescence dating - Wikipedia
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.
The complex history of radioactive force on a sample can be difficult to estimate. However, thermoluminescence proven acceptable in providing approximate dates in the absence of more exact measures. University of New Mexico Press: Thermoluminescence Dating Thermoluminescence can be used to date materials containing crystalline minerals to a specific heating event.
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Seminar Press, New York: In , they also developed optically stimulated luminescence dating techniques, which use laser light, to date sediments. The microscopic structure of some minerals and ceramics trap nuclear radioactive energy. This energy is in constant motion within the minerals or sherds. Most of the energy escapes as heat, but sometimes this energy separates electrons from the molecules that make up the minerals or ceramics. Usually the electrons will reconnect with the molecules, but some will not.
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The electrons that dont reconnect eventually encounter imperfections in the microscopic structure of the ceramics or minerals, and they become trapped by these imperfections. Over time energy in the form of more and more trapped electrons is stored in these structural imperfections.
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By heating the ceramic or mineral to above degrees Celcius, these trapped electrons are released, creating a flash of light called thermoluminescence. When a laser light source is used to stimulate the release of electrons, the process is called optically stimulated luminescence.
Luminescence Profile In the process of making a ceramic vessel, the soft clay vessel must be heated in a kiln to harden it.
The process of firing the vessel releases the trapped electrons energy , and resets the thermoluminescence clock to zero. The process of accumulation of electrons energy and then release when heated occurs every time the ceramic vessel is reheated.
Thermoluminescence dating - Wikipedia
What an archaeologist would be able to measure using this technique is the last time the vessel was heated above degrees Celcius, either at the time the vessel was first fired or the last time it was heated if it was used as a cooking vessel. In the laboratory, the release of electrons can be induced through heating or the use of a laser beam.
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The intensity of the light emmisions luminescence can be measured to determine the amount of time that has passed since the vessel was last heated and the present laboratory heating of the vessel. How is a Luminescence Sample Processed?