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This radiation may in some cases contribute over half the total dose.
It is also rare that any information about the radiation from the burial soil can be obtained, as art objects are usually thoroughly cleaned.These will give an authentic date for a bogus object.It must be realized that TL dating is but one of the criteria for judging authenticity.Using this information often reduces the uncertainty to 15-25 per cent. Nearly any mineral material which has been heated above 500C at a time one wishes to know is a candidate for TL dating. Porcelains, being nearly vitrified, are a special case requiring a fairly large solid core sample, and TL dating of intact objects is not recommended because of the damage caused by sampling.Most porcelain dating is done for insurance purposes on broken objects.