Optically stimulated luminescence dating technique, optically stimulated luminescence dosimetry
We have to be very careful not to expose the sediments to sunlight when we do this!
OSL specialists overcome these challenges through only sampling certain glacial landforms, where greater sunlight exposure is likely to have occurred prior to deposition e. For potassium feldspar or silt-sized grains, near infrared excitation IRSL is normally used and violet emissions are measured.
Photographs taken by Geoff Duller Aberystwyth University. Laboratory fading rates of various luminescence signals from feldspar-rich sediment extracts.
Quaternary Geochronology 8, The radiation causes charge to remain within the grains in structurally unstable "electron traps".
There are advantages and disadvantages to using each. A robust feldspar luminescence dating method for Middle and Late Pleistocene sediments.
It is necessary to use red light conditions in the laboratory because the luminescence signal is light sensitive, and red light does not re-set it. Potential readers include personnel involved in radiation protection practice and research, hospitals, nuclear power stations, radiation clean-up and remediation, food irradiation and materials processing, security monitoring, geological and archaeological dating, luminescence studies of minerals, etc.
Other important factors that need to be considered when calculating the radiation dose rate are the water content of the sediment and how much sediment is on top of the sample site.
Radiation Measurements 43, OSL is used on glacial landforms that contain sand, such as sandur or sediments in glacial streams. The various stimulation modes continuous wave, pulsed, or linear modulation are introduced and compared.
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