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This radiation may in some cases contribute over half the total dose.Finally, one has to make the measurements regardless of whether the TL of the clay is well-behaved or not.Much stoneware is not so hard as porcelain and may be sampled by drilling.The clay cores from lost wax metal castings may readily be tested.WARNING ABOUT FAKES USING ANCIENT MATERIALS Recently there has been a spate of forgeries devised expressly to attempt circumventing TL dating.

For example figures, normally modeled, may be carved out of brick or assembled out of fragments. It is an absolute dating method, and does not depend on comparison with similar objects (as does obsidian hydration dating, for example). The thermoluminescence technique is the only physical means of determining the absolute age of pottery presently available.While not so accurate as radiocarbon dating, which cannot date pottery (except from soot deposits on cooking pots), TL has found considerable usefulness in the authenticity of ceramic art objects where high precision is not necessary.Since the university laboratories involved with TL are research facilities, they generally will not accept art objects for authentication on a routine basis.

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