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It is found that the thermoluminescence (TL) at high temperatures can be bleached significantly, but no effects were observed on TL signals used for the pre-dose dating technique.
It is concluded that the pre-dose dating technique can be applied to samples even after light exposures.
Here at Oxford Authentication we have specialised in authenticating ceramic antiquities since 1997.
Our reports are held in the highest regard and accepted as a stamp of endorsement from museums, auction houses, dealers, collectors and courts of law the world over.
It is useful to geologists and archaeologists who want to know when such an event occurred.This produces a date for the burial of the deposit.The object to be dated is heated in a laboratory until it glows.Thermoluminesence (TL) and Optically Stimulated Luminesence (OSL) are related techniques which measure when objects were last heated (TL) or when buried deposits were last exposed to light (OSL).TL and OSL are known as 'electron trap' techniques.
Part of this is the ordinary glow of burning, the remainder is due to escape of these trapped electrons and this is measured.