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Drilling, the usual method of sampling, introduces some uncertainty.

It is also rare that any information about the radiation from the burial soil can be obtained, as art objects are usually thoroughly cleaned.

This is adequate for the purposes of authentication where the question is whether the piece was fired in antiquity or recently; it will not differentiate, say, between a classic Greek terra cotta and a Roman copy.

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Since the university laboratories involved with TL are research facilities, they generally will not accept art objects for authentication on a routine basis.WARNING ABOUT FAKES USING ANCIENT MATERIALS Recently there has been a spate of forgeries devised expressly to attempt circumventing TL dating.These use pottery of the appropriate period to construct objects.A leaflet from Daybreak describing the TL technique in more detail and giving a bibliography will be provided to interested persons.The phenomenon of thermoluminescence was first described by the English chemist Robert Boyle in 1663.Heated stone material, such as hearths, pot boilers, and burnt flints, has been dated as well.