Osl luminescence dating

Electrons from these substances get trapped in the mineral's crystalline structure, and continuing exposure of the rocks to these elements over time leads to predictable increases in the number of electrons caught in the matrices.

But when the rock is exposed to high enough levels of heat or light, that exposure causes vibrations in the mineral lattices and the trapped electrons are freed.

Smedley, Julie Durcan, Claire Christophe, Antoine Zink, Guillaume Guerin, Georgina E.

In archaeology, OSL dating is applied to ceramics: The dated event is the time of their last heating to a high temperature (in excess of 400 °C).

Recent OSL dating of stone tools in Arabia pushed the "out-of-Africa" date hypothesis of human migration back 50,000 years and added a possible path of migration from the African continent to the Arabian peninsula instead of through Europe.

Neutron radiation with energies of 40 ke V to greater than 35 Me V has a dose measurement range from 20 mrem to 25 rem.

In diagnostic imaging the increased sensitivity of the OSL dosimeter makes it ideal for monitoring employees working in low-radiation environments and for pregnant workers.

Luminescence dating is good for between a few hundred to (at least) several hundred thousand years, making it much more useful than carbon dating.

The term luminescence refers to the energy emitted as light from minerals such as quartz and feldspar after they've been exposed to an ionizing radiation of some sort.

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.

If the centre with the hole is a luminescence center (radiative recombination centre) emission of light will occur.

The photons are detected using a photomultiplier tube.

The signal from the tube is then used to calculate the dose that the material had absorbed.

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