Thermoluminescence dating ceramics pottery
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Dating Techniques - Thermoluminescence Dating
Per-dose speaking. Pottery time from being. Chin Sci Fool,29 1:.
This process frees electrons within elements or minerals that remain caught within the item. Thermoluminescence testing involves heating a sample until it releases a type of light. This light is then measured to determine the last time the item was heated. When irradiated crystalline material is again heated or exposed to strong light, the trapped electrons are given sufficient energy to escape. In the process of recombining with a lattice ion, they lose energy and emit photons light quantadetectable in the laboratory. The amount of light produced is proportional to the number of trapped electrons that have been freed which is in turn proportional to the radiation dose accumulated.
In order to relate the signal the thermoluminescence—light produced when the material is heated to the radiation dose that caused it, it is necessary to calibrate the material with known doses of radiation since the density of traps is highly variable. Thermoluminescence dating presupposes a "zeroing" event in the history of the material, either heating in the case of pottery or lava or exposure to sunlight in the case of sedimentsthat removes the pre-existing trapped electrons. Therefore, at that point the thermoluminescence signal is zero. As time goes on, the ionizing radiation field around the material causes the trapped electrons to accumulate Figure 2.
In the laboratory, the accumulated radiation dose can be measured, but this by itself is insufficient to determine the time since the zeroing event. The Radiation Dose Rate - the dose accumulated per year-must be determined first. This is commonly done by measurement of the alpha radioactivity the uranium and thorium content and the potassium content K is a beta and gamma emitter of the sample material. Often the Thermoluminescence dating ceramics pottery radiation field at the position of the sample material is measured, or it may be calculated from the alpha radioactivity and potassium content of the sample environment, and the cosmic ray dose is added in.
Once all components of the radiation field are determined, the accumulated dose from the thermoluminescence measurements is divided by the dose accumulating each year, to obtain the years since the zeroing event. Thermoluminescence Techniques in Archaeology. Clarendon Press, Google Scholar Zimmerman D W. Introduction to basic procedures for sample preparation and TL measurement of ceramics. PACT,2: Aitken M J. Thermoluminescence Dating. Academic Press, Google Scholar Thermoluminescent dating using fine grains from pottery. Study of thermoluminescence of crystalline extracts from pottery. Archaeometry,9: Thermoluminescence dating of ancient ceramic in Chinese.
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Pottery ceramics Thermoluminescence dating
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