What is osl dating
The limiting factor in the age range for luminescence dating is the 'saturation' of the signal at large dose rates (i.e. Accurate age determination therefore becomes increasingly difficult for older samples and there is a loss in dating precision (an increase in statistical uncertainty).
The point at which a sample becomes saturated depends on the dose rate of the sample.
The luminescence of each sample is measured using industry-standard Luminescence Readers (manufactured by Risoe National Laboratories, Denmark) which incorporate 90Sr beta-sources, and 470nm LED optical stimulation.
The total absorbed dose (termed De, measured in units of Gy) is measured using standard luminescence dating procedures (Murray and Wintle, 2000).
Samples subjected to a high dose rate will become saturated more quickly, and fully saturated samples will not record the full duration of their burial history.