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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.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.The TL laboratory at Daybreak was established in 1977 to make TL available to the art community in general. Studies at Oxford back in the 70s on Romano-British pottery indicated that when all quantities entering the age equation are measured, the TL date of a single potsherd will typically fall within 15 per cent of the known date.
In all, close to two dozen physical quantities must be accurately measured to establish the relationship between doses of different kinds of radiation and light output, and to compute dose rate.
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.
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.
In some categories of objects, from China, for example, the actual age is quite precisely known for short-lived styles, and it is possible to work "backwards" to get information about the environment in many parts of the world, and some other parameters not usually measurable for art objects.