As sediments are buried longer they progressively acquire more TL from accumulated radiation damage from alpha, beta, and gamma rays and cosmic radiation.If the total amount of radiation dose received can be calculated, and the current dose rate measured, then dividing the total dose by the yearly dose rate will yield a TL age.TL dating is a matter of comparing the energy stored in a crystal to what "ought" to be there, thereby coming up with a date-of-last-heated.In the same way, more or less, OSL (optically stimulated luminescence) dating measures the last time an object was exposed to sunlight.Faulted and liquefied Lake Bonneville strata in Hansel Valley, VT, record a history of recurrent surface faulting which culminated in the 1934 M6.6 earthquake.
Used particularly for edu.au/environment/ee Pages/ee Dating/Quaternary Geochronology/ Trapped Charge Dating PRINCIPAL: energy trapped in crystal imperfections depends on dose rate and time. establish hydration rate for each type of obsidian by examining pieces of known age, or with high pressure and temperature in lab.
Sample discs are mounted on a wheel and the readers are programmed to run heating and irradiation sequences.
The TL is measured using a sensitive detector called a photomultiplier tube.
Therefore, although ceramic TL dating can in general solve the problem of authentication of ancient ceramics, there are still complexities that require further research and study.
Thermoluminescence (TL) of minerals is the release of light when grains are heated to 1500 -5000 C.