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The intensity of the thermoluminescence light is proportional to the time that has passed from the last clock resetting event, which for ceramics correspond to when it was baked.When collecting samples for thermoluminescence dating, several samples from different vessels should be taken, not smaller than 1 gram.Radioactive elements decay at a certain constant rate and this is the basis of radiometric dating.But, the decay elements need to be set, much like you would re-set a stop watch for a runner, to ensure an accurate measurement.Therefore, thermoluminescence dating is actually determining the last time a crystal was heated and electrons were released.
This usually occurs when the items are heated to 350 degrees Celsius.However, sedimentary rocks can be age dated if a volcanic ash horizon or a diabase sill or dyke can be found within the sequence.For example, if you find a dinosaur bone in a sedimentary sequence and you find an ash layer 10 meter above the bone and another ash layer 20 meters below it, you can determine the age of the two ash layers.The accuracy of thermoluminescence dating is only about 15% for a single sample and 7 to 10% for a suite of samples in a single context.
Create fake pottery that will pass the thermoluminescence test One way to pass a fake through a TL test is to expose the newly-made pottery to a high dose of artificial radiation sources, thus fooling the measurement instruments.
Forgers commonly use the bottom of an original broken vessel, which has no commercial value, and make a new fake vessel on top of it.