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Posted by / 28-Jan-2015 18:48

Luminescence dating laboratory

The type light source to be used depends upon the mineral used for dating.

Blue or Green light is used when dealing with quartz and for feldspar infrared light is commonly used.

Trapping: Upon exposure to nuclear radiation, some bound electrons of the atoms making up a mineral's lattice are detached from their parent nuclei and become freely mobile: they are said to enter the conduction band.

Structural defects in the lattice (vacancies, interstitial atoms, and substitutional impurities) create localized charge deficits, which act as traps T for the conduction electrons.

The amount of the accumulated palaeodose is proportional to both the rate of radiation absorption by the material, and the time that has elapsed between the initializing event and the luminescence read-out.

The following simple equation relates these quantities: The total radiation dose which material receives annually is called as annual radiation dose.

This measured signal provides a measure to the palaeodose received in the intervening period of burial.

The Luminescence Dating Laboratory exists since 2003 and is a key research facility of the ‘Environmental Change’ research group.

The laboratory is located on the 7th floor of the Roxby building.

The main categories of materials, which may be dated by Luminescence, are archaeological pottery, riverine, aeolian, glacial and lacustrine sediments.

Fault gouges, and stalagmites are other important materials that can be dated with this technique.

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