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A director of Oxford Authentication® Ltd, Doreen Stoneham has been conducting authenticity tests since 1970, originally with the Research Laboratory for Archaeology at Oxford University, which pioneered the TL testing process.
It was there, in the early 1980s, that Doreen perfected the technique for the safe and reliable testing of porcelain.
Like most dating methods used by secularists, many assumptions are built into their speculations and hypotheses.
Thermoluminescence, or TL, has been used since the 1950s to determine the approximated firing date of pottery and burnt silicate materials.
When scientists pull pottery from the ground, they use heat or lasers to de-excite these electrons out of their trap states back to their original state. Scientists measure the amount of light to get the total measured radiation dose (TMRD).
They divide this by an assumed radiation dose rate (RDR) to estimate the pottery’s age.
Samples require about 100 milligram and the sample collection and handling step is critical. The rate of energy accumulation depends on the amount of background radiation to which the object has been exposed.
Thus, preliminary X-ray or gamma radiography examination of the object can increase the amount of accumulated energy and thus give erroneous dating result.