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'''Optically Stimulated Luminescence''' or '''OSL Dating''' is a method of establishing the age of soil sediments. It is used by [[archaeologist]]s as an alternative to [[
All soils contain trace minerals including [[uranium]], [[thorium]] and [[potassium]]. These slowly decay over time and the ionising radiation they produce is absorbed by other constituents of the soil sediments such as [[quartz]] and [[feldspar]]. Stimulating samples using [[infrared]] light causes luminescence, the intensity of which varies depending on the amount of radiation absorbed. Exposure to sunlight resets the luminescent signature and so the time period since the soil was buried by later sediments can be calculated.
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