Osl dating method

05-Sep-2019 14:09

Organic matter needs to have been buried and preserved for this technique. It assumes that organic material is not contaminated with older radiocarbon (which, for example, is a common problem with organic material from marine sediment cores around Antarctica).

Amino Acid Racemisation dates the decay and change in proteins in organisms such as shells.

The OSL (optically stimulated luminescence) dating method exploits dosimetric properties of grains of minerals naturally occurring in sediments and man-made materials.

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It uses various methods to stimulate and measure luminescence.Most methods rely on indirect methods of dating subglacial tills, such as dating organic remains above and below glacial sediments.Many methods are only useful for a limited period of time (for radiocarbon, for example, 40,000 years is the maximum age possible).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.

It uses various methods to stimulate and measure luminescence.Most methods rely on indirect methods of dating subglacial tills, such as dating organic remains above and below glacial sediments.Many methods are only useful for a limited period of time (for radiocarbon, for example, 40,000 years is the maximum age possible).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.It assumes that boulders have not been buried and then re-exposed at the Earth’s surface.