Despite the progress toward understanding the chronological and spatial aspects of the wheels, a great deal of research remains to resolve the actual nature of these enigmatic stone structures.The OSL (optically stimulated luminescence) dating method exploits dosimetric properties of grains of minerals naturally occurring in sediments and man-made materials.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. Measuring the environmental dose rate for an OSL sample from Glen Tulla, Scotland.
The number of trapped electrons depends on the total amount of radiation that the mineral has been exposed to.
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.
We have to be very careful not to expose the sediments to sunlight when we do this!
The OSL signal is reset by exposure to sunlight, so the signal is reset to zero while the sand is being transported (such as in a glacial meltwater stream).
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.