Stimulating these mineral grains using either light (blue or green for OSL; infrared for IRSL) or heat (for TL) causes a luminescence signal to be emitted as the stored unstable electron energy is released, the intensity of which varies depending on the amount of radiation absorbed during burial and specific properties of the mineral.Most luminescence dating methods rely on the assumption that the mineral grains were sufficiently "bleached" at the time of the event being dated.
In the last few decades optically stimulated luminescence (OSL) dating has become an important tool in geochronological studies. dating the depositional age of sediments directly, can be impaired by incomplete bleaching of grains.
This can result in a scattered distribution of equivalent doses (D), leading to incorrect estimation of the depositional age.
Coarse grain quartz (100–200 μm and 150–250 μm) and polymineral fine grains (4–11 μm) were dated using the single aliquot regenerative (SAR) dose protocol.
The paleodose (D) was calculated from the DE data set using different approaches.
All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium, uranium, thorium, and rubidium.