Osl dating sampling in research, explaining the science of Antarctic glaciers
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 measure this emitted light the luminescence and this is the first stage towards measuring the sample age.
The number of trapped electrons depends on the total amount of radiation that the mineral has been exposed to. This is because water attenuates scatters the radiation, reducing the total radiation dose that the sample has been exposed to. This occurs if the grains of sand are not exposed to sufficient sunlight prior to deposition within a landform such as a glacial moraine. Photograph used with permission of Geoff Duller. From this curve we can calculate the dose that our sample must have received to produce the amount of light that we measured first.
Optically stimulated luminescence dating of glaciofluvial sediments on the Canterbury Plains, South Island, herpes dating site edmonton New Zealand. 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
We then give our sand sample a range of laboratory radiation doses and measure the luminescence that each dose produces to develop a calibration curve. The gamma spectrometer has been put into the sample hole see the lead going from the gamma spectrometer crystal to the control box. We analyse the quartz or feldspar minerals in sand deposits.
Explaining the science of Antarctic glaciers
How do we measure the radiation dose rate? The methods through which dose rates are calculated vary between different laboratories worldwide. Photographs taken by Geoff Duller Aberystwyth University. Road cut through glacial outwash sediments, Patagonia.
Sediment transport in glacial environments is often over short distances in turbid meltwater streams, which can limit the sunlight exposure that the grains of sand receive. Quaternary glaciation of Mount Everest. Once we have calculated our equivalent dose, we need to measure the environmental radiation dose rate. The proglacial delta at Nigardsbreen, Jostedalen, Southern Norway. We have to be very careful not to expose the sediments to sunlight when we do this!
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