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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.This last procedure involves the use of a radioactive source, though very weak.
The light is proportional to the amount of radiation absorbed since the material was last heated.
Electron trapping Energy absorbed from ionizing radiation frees electrons to move through the crystal lattice, where some are trapped at imperfections.
Later heating releases the trapped electrons, producing light whose intensity is proportional to the amount of radiation absorbed.
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.Energy absorbed from ionizing radiation frees electrons to move through the crystal lattice, some of which are trapped at imperfections in the crystal lattice.