The underestimates were found to be caused by a change in mineral sensitivity resulting from the Regen requirements of strong laboratory light-bleaching followed by irradiations.A simple method to test and correct for this condition is presented.
Two recent reports, however, indicate age underestimates on feldspar in some European loesses older than 50 ka, the effect increasing in severity with age.
Suggested causes include decay of luminescence centers, or does dependent sensitivity changes.
Artefacts terminated mid-way down one profile, which had a basal age of about 100 kyr.
Confidence in the TL dates is given by their close correspondence with radiocarbon dates obtained from the upper occupation levels.
The way you measure energy stored in an object that you expect has been exposed to heat or light in the past, is to stimulate that object again, and measure the amount of energy released.
The energy released by stimulating the crystals is expressed in light (luminescence).Data presented in this paper do not support these limitations or explanations.TL provides 3 separate techniques of dating sediments, which, when used together, prove to be efficient internal cross checks for mineralogical anomalies or inconsistencies created by any of the individual methods.These TL dates are not only the oldest yet proposed for Aboriginal occupation but also may mark the time of initial human arrival on the Australian continent.Luminescence dating (including thermoluminescence and optically stimulated luminescence) is a type of dating methodology that measures the amount of light emitted from energy stored in certain rock types and derived soils to obtain an absolute date for a specific event that occurred in the past.But when the rock is exposed to high enough levels of heat or light, that exposure causes vibrations in the mineral lattices and the trapped electrons are freed.