Osl dating australia


15-Mar-2019 03:45

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All sediments and soils contain trace amounts of radioactive isotopes of elements such as potassium, uranium, thorium, and rubidium.These slowly decay over time and the ionizing radiation they produce is absorbed by mineral grains in the sediments such as quartz and potassium feldspar.Stimulating these mineral grains using either light (blue or green for OSL; infrared for IRSL) or heat (for TL) causes a luminescence signal to be emitted as the stored unstable electron energy is released, the intensity of which varies depending on the amount of radiation absorbed during burial and specific properties of the mineral.

In multiple-aliquot testing, a number of grains of sand are stimulated at the same time and the resulting luminescence signature is averaged .The radiation causes charge to remain within the grains in structurally unstable "electron traps".



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