Acquisition of an automated luminescence reader for optical dating of Quaternary sediments

从最近(几十年)到非常古老(约500ka)，发光法正在成为测定第四纪事件和环境变化时间的最有前途的方法。从沉积物中提取的石英和长石矿物的光学受激发光(OSL)发射是对沉积以来所经过的时间的衡量。由于90%以上的发光数据来自石英，长石发光领域仍处于全面的研究开发阶段，因为后者有可能测定比最大石英年龄限制早5到10倍的事件。所需设备是标准TL/OSL Risø读取器，允许完全自动化发光测量(照射、预热、漂白和刺激)。该系统是世界上大多数实验室的标准设备，因为它高效、可靠，最重要的是，它的自动化专门适用于单等分工作。这项收购对学生和研究合作者来说至关重要，因为它将允许在氦大气中进行测量，氦大气显示出更好的导热系数，并可以将发光测量的重现性提高一个数量级。

Luminescence is emerging as the most promising method for dating Quaternary events and timing environmental changes, from the very recent (few tens of years) to the very old (~ 500 ka). The optically stimulated luminescence (OSL) emission of quartz and feldspar minerals extracted from sediments is a measure of the time elapsed since deposition. As more than 90% of the luminescence dates being published are from quartz, the field of feldspar luminescence is still in full research development, as the latter has the potential to date events that are 5 to 10 times older than the maximum age limit for quartz.The requested equipment is a standard TL/OSL Risø reader that allows full automation of luminescence measurements (irradiation, preheating, bleaching and stimulation). This system is the standard equipment in most laboratories of the world as it is efficient, reliable and, above all, its automation is specifically adapted to single aliquot work. This acquisition is of primary importance for students and research collaborators as it will allow measurements in Helium atmosphere, which shows a better thermal conductivity and can increase the reproducibility of luminescence measurements by an order of magnitude.