Thermoluminescence dating pottery
The TL is measured using a sensitive detector called a photomultiplier tube.Thermoluminescence (TL) dating is the determination, by means of measuring the accumulated radiation dose, of the time elapsed since material containing crystalline minerals was either heated (lava, ceramics) or exposed to sunlight (sediments).The clay core of bronze sculptures made by lost wax casting can also be tested.Different materials vary considerably in their suitability for the technique, depending on several factors.When a specimen is reheated, the trapped energy is released in the form of light (thermoluminescence) as the electrons escape.The amount of light produced is a specific and measurable phenomenon.The organic-tempered pottery from the Russian Far East therefore looks promising for future dating by the AMS radiocarbon and TL methods.Thermoluminescence Dating Thermoluminescence can be used to date materials containing crystalline minerals to a specific heating event.
Seriation, also called artifact sequencing, is an early scientific method of relative dating, invented (most likely) by the Egyptologist Sir William Flinders Petrie in the late 19th century.
Petrie's problem was that he had discovered several predynastic cemeteries along the Nile River in Egypt that seemed to be from the same period, but he needed a way to put them in chronological order.
Absolute dating techniques were not available to him (radiocarbon dating wasn't invented until the 1940s); and since they were separately excavated graves, stratigraphy was no use either.
We have 3 fully automated, computer operated Riso Minisys TL readers for measuring the TL.
Sample discs are mounted on a wheel and the readers are programmed to run heating and irradiation sequences.