Osl dating sediments
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. Once the sand grain has been buried and it is no longer exposed to sunlight, the OSL signal starts to accumulate. Testing an approach to OSL dating of Late Devensian glaciofluvial sediments of the British Isles. OSL works because all sediments have some natural radioactivity, caused by the presence of uranium, thorium and potassium isotopes in heavy minerals such as zircons.
The equivalent dose value is measured in the SI unit “grays” (Gy). Depositional pathway tracing in glacial catchments using the OSL of coarse-grained quartz and K-feldspar.
In addition to radiation from the surrounding sediment, OSL samples are affected by a cosmic dose rate, which reduces as the amount of sediment the sample is buried under increases.