Luminescence dating refers to a group of methods of determining how long ago mineral grains were last exposed to sunlight or sufficient heating.
It is useful to geologists and archaeologists who want to know when such an event occurred.
With desert winds as their eternal sculptor, these dunes change beautiful colors with the movement of the sun in the beautiful clear skies of Rajasthan.
"Optical dating" typically refers to OSL and IRSL, but not TL.
All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium, uranium, thorium, and rubidium.
These slowly decay over time and the ionizing radiation they produce is absorbed by mineral grains in the sediments such as quartz and potassium feldspar.
The radiation causes charge to remain within the grains in structurally unstable "electron traps".