The TL dating requires the measurement of two quantities: the total accumulated absorbed radiation dose in selected minerals (so-called palaeodose) and the annual dose due to the natural radioisotope content of the sample and its surrounding environment.
From these two measurements, the TL age can be subsequently calculated from the basic equation: age=(palaeodose)/(annual dose).
Quarz and feldspar as well as a number of other minerals have the ability to store energy generated by radioactive radiation.
Under exposure to great heat such minerals release this energy again in form of light impulses.
At the re-heating of a material sample taken from the fired object impulses of emitted light can be measured in the laboratory which correspond with the time interval between the present observation and the last firing.
These findings have provided us with the basic principles of scientific dating methods. The so-called ‘archaeological energy ‘ or N T L – .
A precise evaluation of the gamma radiation energy is only possible when the exact geological conditions at the location of origin of the examined find are known.