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

获取用于第四纪沉积物光学测年的自动发光读取器

• 批准号: 359986-2008
• 负责人: Lamothe, Michel
• 金额: $ 6.23万
• 依托单位: Université du Québec à Montréal
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments - Category 1 (<$150,000)
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=363049
• 关键词: Acquisition; automated; luminescence; reader; optical

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.

发光是最有前途的方法来确定第四纪事件和时间的环境变化，从最近（几十年）到非常古老的（~ 500 ka）。从沉积物中提取的石英和长石矿物的光释光（OSL）发射是自沉积以来经过的时间的量度。由于超过90%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，因为后者有可能测得比石英最大年龄限制早5到10倍的事件。要求的设备是标准TL/OSL Risket阅读器，可以实现发光测量（辐照，预热，漂白和刺激）的完全自动化。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。此次收购对于学生和研究合作者来说至关重要，因为它将允许在氦气气氛中进行测量，氦气气氛具有更好的导热性，并且可以将发光测量的重现性提高一个数量级。