Optical luminescence dating
These slowly decay over time and the ionising radiation they produce is absorbed by other constituents of the 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.The technique can be applied to material from about 100 to several hundred thousand years old. The Luminescence Dating Facility at Victoria University is the only one of its kind in New Zealand and is led by Prof Rewi Newnham and Ningsheng Wang. | Calculating Age | Challenges for OSL | Case studies of OSL dating in glacial environments | References | Comments | Another way of dating glacial landforms is optically stimulated luminescence dating (OSL).
If we assume that the radiation dose rate of the sediment has remained constant over time, then if we measure that dose rate, we can calculate the sample age.
This is done in collaboration with the University of Oxford Luminescence Dating Laboratory.
Although a relatively new technique, particularly in subaqueous sediments, Strata Data have pioneered its industrial application in dating superficial seabed deposits for geohazard risk assessment.
The report will contain OSL results calibrated for sample water content and salinity.
Turnaround time is several weeks to several months and very dependent on the time taken to prepare the samples, with organic rich samples taking the longest. All sediments contain trace minerals including uranium, thorium and potassium.
Suitable for samples up to about 150Ka containing quartz. Ideal for young sediments with no biogenic material present or where the age of the sediments exceeds the range of 14C dating (c. Requires precise measurement of sample water content and salinity.