What is optically stimulated luminescence dating europe dating of charge
The methods through which dose rates are calculated vary between different laboratories worldwide. The radiation dose rate is also measured in grays, but as we calculate the dose rate per thousand years, it is grays per thousand years (Gy/ka). A robust feldspar luminescence dating method for Middle and Late Pleistocene sediments. The number of trapped electrons depends on the total amount of radiation that the mineral has been exposed to. If we assume that the radiation dose rate of the sediment has remained constant over time, then if we measure that dose rate, we can calculate the sample age. We prepare the sample through treating it with acids to remove any calcium carbonate or organic material, and sieve it to get a specific grain size (usually between 0.018 – 0.025 mm diameter), which we then measure in a specialised instrument. In the Aberystwyth Luminescence Laboratory our instruments are made by a Danish manufacturer and are called “Risø OSL/TL readers”.
The way that we do this is through sampling sand from the landforms in opaque plastic tubes and taking the sample back to a luminescence laboratory where only red light conditions are used. Optically stimulated luminescence dating of glaciofluvial sediments on the Canterbury Plains, South Island, New Zealand.
This occurs if the grains of sand are not exposed to sufficient sunlight prior to deposition within a landform such as a glacial moraine.