The method is based on the fact that natural crystalline minerals, like quartz and feldspar, absorb and retain ionizing energy from the environment in the form of free electrons that have become trapped at structural defect or impurity sites in the crystal lattice.Free electrons can be emptied from traps by exosure to sufficient heat or light.
The age of the pottery, in principle, may then be determined by the relation Age = Accumulated dose / Dose per year Although conceptually straightforward, TL has proven to to be far from simple in practice.
Should I be concerned about artificial irradiation? If the radioactivity of the pottery itself, and its surroundings, is measured, the dose rate, or annual increment of dose, may be computed.
Warning about fakes using ancient materials What about airport x-rays and radiography? Thus, when one measures dose in pottery, it is the dose accumulated since it was fired, unless there was a subsequent reheating.
We describe the experimental procedures that are being used and discuss the dating results that have been produced, and the response by archaeologists to our two tier service.
The service has also undertaken non-archaeological TL research work for other universities and commercial organisations. Although carefully collected, accuracy cannot be guaranteed.
The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Differing provisions from the publisher's actual policy or licence agreement may be applicable.Thermoluminescence (TL) dating has been a significant geochronological tool in Quaternary research for more than 40 years.A unique TL ceramic dating service has been operational at the Durham TL Laboratory for 1 year.Its development has formed part of a research project to investigate the feasibility of a commercially-based dating service.A two tier structure for the service provides low overall accuracy (±20% of the TL age) survey dates and high overall accuracy (±5 to ±10% of the TL age) dates in a dating programme consisting of a minimum of ten sherds.The tests performed for survey dating allow us to examine the potential of samples for high accuracy dating and, in over 60% of cases, provided low accuracy survey dates.