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What is Luminescence Dating?
What is Luminescence dating? - DRI Desert Research Institute
Luminescence dating typically refers to a suite of radiometric geologic dating techniques whereby the time elapsed since the last exposure of some silicate minerals to light or heat can be measured. When dosed minerals are then re-exposed to light or heat, they release the stored electrons, emitting a photon of light that is referred to as luminescence. This 'bleaching' process empties the electrons stored in the traps and resets or 'zeroes' the signal. The electron may become trapped at a defect site T1, T2 etc for some time Storage. When the crystal is stimulated by light or heat, the electrons in the traps are evicted into the conduction band Eviction.
Aberystwyth Luminescence Research Laboratory
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. The method is a direct dating technique , meaning that the amount of energy emitted is a direct result of the event being measured. Better still, unlike radiocarbon dating , the effect luminescence dating measures increases with time. As a result, there is no upper date limit set by the sensitivity of the method itself, although other factors may limit the method's feasibility.
The detective work then began of trying to determine the age of the carvings. The result means that the rock art is at least 15, years old, and probably older, because the carvings show signs of having already weathered before they became covered in sediment. Image right : General view of the Qurta I site from the south. Antiquity vol 85, no , pages This property is both useful and challenging at the same time.