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Accurate Luminescence Dating: Developing Combined Spectral- and Time-Resolved OSL

准确的发光测年：开发组合的光谱和时间分辨光释光

基本信息

批准号：
NE/H002715/1
负责人：
Adrian Finch
金额：
$ 20.25万
依托单位：
University of St Andrews
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2009
资助国家：
英国
起止时间：
2009 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FH002715%2F1
关键词：
Accurate Luminescence Dating Developing Combined

项目摘要

Obtaining the dates at which particular sediments were laid down, or the ages when archaeological artefacts were made, is one of the key challenges to understanding landscape development, the migration of early hominids and the activity of Prehistoric man. One of the most successful means of dating sedimentation and human artefacts is Optically Stimulated Luminescence (OSL). Samples that are collected in total darkness emit a tiny glow when they are exposed to light, and the intensity of this glow is dependent on the age of the sample. The present study will build an instrument that measures not only the intensity of the glow, but also its colour ('spectral resolution'). Commercial dating instruments can only measure the intensity. To do this, we will build a detector that works on a different principle to the commercial systems, and which will use the most modern advances in imaging detector technology. Once this part of the project is successful, we will switch the stimulation on and off at e.g. one thousand times a second and see how the resultant OSL switches on and off. We will observe a slight delay (the 'lifetime') between the stimulation pulses and the pulses of light coming out, and studying the light in this way is called 'time-resolution'. The lifetime will vary from ns (i.e. billionths of a second) to a few seconds in duration. By looking at the lifetimes, we can separate out light generated by different structures (called 'centres') within the mineral. Where two centres happen to emit light of the same colour, analysis of the lifetimes provides a route to separate them. We anticipate that we will obtain better age estimates by only looking at the intensity of light emitted with particular colours and lifetimes, i.e. by using a system that can study the light with combined spectral and time-resolution. We will analyse a suite of samples with the new system that have been already been studied using a commercial (Riso) system to see whether our instrument produces significant improvements. The samples include the two most important minerals for dating - quartz and feldspar - and will compare and contrast minerals which have provided accurate age estimates with those for which dating has been unsuccessful. In this manner, we will determine whether combined spectral- and time-resolved OSL is a major advance on traditional OSL methods.

获得特定沉积物的沉积日期或考古文物的制作年代，是了解景观发展、早期原始人类迁徙和史前人类活动的关键挑战之一。测定沉积物和人类文物年代的最成功的方法之一是光激发光（OSL）。在完全黑暗中收集的样本在暴露于光线时会发出微小的光芒，这种光芒的强度取决于样本的年龄。本研究将建造一种仪器，不仅可以测量发光的强度，还可以测量其颜色（“光谱分辨率”）。商业测年仪器只能测量强度。为此，我们将构建一个探测器，其工作原理与商业系统不同，并且将使用成像探测器技术中最先进的技术。一旦项目的这一部分成功，我们将在例如 10 点打开和关闭刺激。每秒一千次，看看最终的 OSL 如何打开和关闭。我们将观察刺激脉冲和发出的光脉冲之间的轻微延迟（“寿命”），以这种方式研究光称为“时间分辨率”。生命周期的持续时间从纳秒（即十亿分之一秒）到几秒不等。通过观察寿命，我们可以分离出矿物内不同结构（称为“中心”）产生的光。当两个中心碰巧发出相同颜色的光时，对寿命的分析提供了将它们分开的途径。我们预计，通过仅观察特定颜色和寿命发出的光的强度，即通过使用可以结合光谱和时间分辨率来研究光的系统，我们将获得更好的年龄估计。我们将使用新系统分析一组已经使用商业 (Riso) 系统进行研究的样品，以查看我们的仪器是否产生显着改进。这些样本包括两种最重要的测年矿物——石英和长石——并将对提供准确年龄估计的矿物与测年不成功的矿物进行比较和对比。通过这种方式，我们将确定组合的光谱和时间分辨 OSL 是否是传统 OSL 方法的重大进步。