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When the object is heated to 350 degrees Celsius the trapped electrons are released and this is called a clock resetting event.
From this time on, electrons start to build up again because of the natural radioactivity.
Samples should be placed in a polyethylene bag and sealed with electrical tape.
To test the date we need to measure the sample’s thermoluminescence light which is then correlated to the accumulated dose of ionizing radiation.
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.
For instance, it is possible to date the wood support of a panel as well as canvas.
The three most important dating techniques which are useful for the analysis of works of art are: Thermoluminescence (TL), Dendrochronology (DC), and Carbon 14 (C15). It dates items between the years 300-10,000 BP (before present).
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.Instead, a less sophisticated method that would deceive TL testing is to reuse original broken and unmarketable pieces.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.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.
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When the sample is heated in the lab, it releases thermoluminescence light.