For example, in quartz a short daylight exposure in the range of 1–100 seconds before burial is sufficient to effectively “reset” the OSL dating clock.This is usually, but not always, the case with aeolian deposits, such as sand dunes and loess, and some water-laid deposits.This is useful for ceramics, as it determines the date of firing, as well as for lava, or even sediments that were exposed to substantial sunlight.These crystalline solids are constantly subjected to ionizing radiation from their environment, which causes some energized electrons to become trapped in defects in the molecular crystal structure.
"Optical dating" typically refers to OSL and IRSL, but not TL.
These show excellent internal consistency, and consistency with both independent dating methods and stratigraphy, with 2 exceptions.
Both exceptions were by the Regen technique giving age underestimates up to 30%.
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.
Luminescence dating refers to a group of methods of determining how long ago mineral grains were last exposed to sunlight or sufficient heating.
All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium, uranium, thorium, and rubidium.