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Then we need to correlate thermoluminescence light to radiation dose rate per year which the sample has received since its last clock resetting event.Eventually, we will follow this formula to found out how many years old the sample is: Age (year) = accumulated dose / dose rate per year Thermoluminescence dating can be performed only in a specialized laboratory which will have a chemical section for the treatment of the samples with reagents and a radiation hazard restricted area.When collecting samples for thermoluminescence dating, several samples from different vessels should be taken, not smaller than 1 gram.Samples should not be exposed to heat and powdery examples should not be exposed to bright light.
Later, heating releases the trapped electrons, producing light.Measuring the intensity of the luminescence can determine how much time has passed since the last time the object was heated.The light is proportional to the amount of radiation absorbed since the material was last heated. Unfortunately there are no affordable direct methods for dating pigments, except in some cases as we will see later.Generally, for example, we can’t establish when a vermilion stroke was brushed onto a painting, but we can date most of the materials that the pigments are painted on.
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Indeed, the figure shows an automatic instrumentation which allows measurement of thermoluminescence light from samples and also the determination of the dose rate per year.