The luminescence dating laboratory undertakes optically stimulated luminescence (OSL/IRSL) and Thermoluminescence (TL) as well as.
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- Luminescence Dating Laboratory | Geography Department at the University of Georgia
- Optically Stimulated Luminescence Dating
- Luminescence Research Laboratory
The total absorbed dose termed De, measured in units of Gy is measured using standard luminescence dating procedures Murray and Wintle, Quartz purity is monitored using infra-red nm stimulation within the standard dating procedure.
Luminescence Dating Laboratory | Geography Department at the University of Georgia
Calculation of the annual dose rate is based on the measured quantities of Uranium, Thorium and Potassium from the sample. Interpolation for a relatively young sample.
Interpolation for a relatively old sample. Application Suitable for samples up to about Ka containing quartz. Technical Information Method All sediments contain trace minerals including uranium, thorium and potassium.
Optically Stimulated Luminescence Dating
Water Content Calibration Water within the soil has an attenuating effect on the ambient radiation. Consequently, samples analysed without consideration of their water content or using a low estimate of water content will return ages younger than samples corrected for this effect. Similarly, inaccurate estimates of pore water salinity will dramatically affect the results. With the assistance of Fugro UK we have developed a method for converting the measured water content to a time-averaged water content for each sample.
Limitations The limiting factor in the age range for luminescence dating is the 'saturation' of the signal at large dose rates i. Accurate age determination therefore becomes increasingly difficult for older samples and there is a loss in dating precision an increase in statistical uncertainty.
Luminescence Research Laboratory
The point at which a sample becomes saturated depends on the dose rate of the sample. 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. In these cases only a minimum age can be determined. However, it is possible to identify saturated samples through measurement.
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A measure is made of a natural signal which is then correlated with the saturating exponential growth curve. The corresponding Equivalent dose is calculated by reading it down to the x-axis. OSL dating is usually performed on sand-sized grains of quartz c.
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The lower age limit is around 30 years, the upper limit around thousand years, depending on the sediment. The luminescence dating laboratory at Wits is the only one of its kind in southern Africa.
We have a range of specialist facilities, including. We provide luminescence ages on a collaborative basis co-authorship on publications using lab results. Please get in touch before submitting samples.