A sample of the earth also needs to be collected so environmental radiation can be tested.The wetness of the soil and the sample should also be recorded.When the object is heated to 350 degrees Celsius the trapped electrons are released and this is called a clock resetting event.
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).
Energy absorbed from ionizing radiation frees electrons to move through the crystal lattice, some of which are trapped at imperfections in the crystal lattice.
Later, heating releases the trapped electrons, producing light.
Thermoluminescent Natural radioactivity causes the number of trapped electrons to build up.
The older an object, the more trapped electrons it will have.
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.
Measuring the intensity of the luminescence can determine how much time has passed since the last time the object was heated.