Definition of thermoluminescence dating
The upper dating limit of quartz dose not exceed 100,000 years. Mejdahl, Risoe National Laboratory, DK-4000 Roskilde, Denmark. The uncertainty of the zero point in this time span introduces a substantial error in age estimates. When an archeologist has identified the source of the obsidian from which an artifact is made, he or she may be able to date the artifact using the obsidian hydration technique.This technique of dating obsidian artifacts measures the microscopic amount of water absorbed on freshly broken surfaces.These complicated factors are analyzed and discussed.Therefore, although ceramic TL dating can in general solve the problem of authentication of ancient ceramics, there are still complexities that require further research and study.The TL dating requires the measurement of two quantities: the total accumulated absorbed radiation dose in selected minerals (so-called palaeodose) and the annual dose due to the natural radioisotope content of the sample and its surrounding environment.
The volcanic glass of Obsidian Cliff in Yellowstone National Park is a National Historic Landmark, and was an important source of raw material for the manufacture of stone tools by Native Americans.
As a dating tool the TL technique has been of great success in authentication of ancient ceramic art objects.
However, a few complicated factors limit the precision and accuracy in age determination.
The study of physical qualities of quartz extracted from sediments shows that the TL peak at 330 deg C (the peak used for TL dating) has second-order kinetics. 463-471; Risoe National Laboratory; Roskilde (Denmark); 3.
The existence of two emission centres, whose intensity is determined by the prehistory of the quartz provides information on the character of dose response. specialist seminar on TL and ESR dating; Elsinore (Denmark); 26-; Available from: V.
After irradiation, a pre-heating is performed in oven at 150° C for 180 s to reduce the contribution of the TL signal coming from unstable traps.