Jon Olley does not work for, consult, own shares in or receive funding from any company or organisation that would benefit from this article, and has disclosed no relevant affiliations beyond the academic appointment above.
Griffith University provides funding as a member of The Conversation AU.
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.
These slowly decay over time and the ionising radiation they produce is absorbed by other constituents of the sediments such as quartz and feldspar.
Michael Westaway receives funding from the Australian Research Council.
This study investigated the applicability of optical dating, using coarse-grained quartz, to provide a chronology of these sediments.A 150-m-long drilling core (YZ07) was retrieved from the southwest coast of the SYS on the northern flank of the Yangtze River delta.Overall, 28 samples extracted from the upper 50 m of core YZ07 were investigated.The spread in measured equivalent doses (Ds) for each sample was generally consistent with the OSL signals being fully reset before deposition.The OSL ages generally increased with depth and indicated a 24-ka sedimentary record for the upper 50 m of the core.
Stimulating samples using infrared light causes luminescence, the intensity of which varies depending on the amount of radiation absorbed.