Interpreting luminescence data from a portable OSL reader: three case studies in fluvial settings

Interpreting luminescence data from a portable OSL reader: three case studies in fluvial settings
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解释便携式 OSL 读数器的发光数据:河流环境中的三个案例研究

DOI:
10.1002/esp.2084
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发表时间:
2010
影响因子:
3.3
通讯作者:
Muñoz-Salinas E
Muñoz-Salinas E
中科院分区:
地球科学2区
文献类型:
--
作者:
Muñoz-Salinas E

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光激发光(OSL)是一种从 20 世纪 80 年代中期开始应用的技术,主要用于沉积物年代测定。 OSL技术基于光对样品的刺激,以确定在沉积、被后来的沉积物掩埋以及随后暴露于来自周围沉积物中的放射性元素的电离辐射之后存储在沉积物颗粒的晶格中的发光信号。在这种沉积物测年中,需要两个参数:等效剂量(即储存在颗粒中的发光信号)和剂量率(即沉积物中天然存在的放射性同位素发出的α、β和γ辐射的电离能,加上宇宙辐射的影响)。在本研究中,OSL 技术不用于约会。该研究的目标是使用苏格兰大学环境研究中心 (SUERC) 设计和制造的便携式 OSL 读取器,仅分析在蓝色 (BLSL) 和红外 (IRSL) 波长光刺激后获得的多矿物样品中的发光信号(总光子计数)。来自柬埔寨、澳大利亚和墨西哥的三个河流案例研究用于说明便携式 OSL 读取器数据可能对一系列不同沉积过程产生的沉积物进行的地貌解释。案例研究表明,可以从便携式 OSL 读取器数据推断沉积物运输和沉积过程的各个方面,从而为地貌历史提供有价值的见解。版权所有 © 2010 约翰威利父子有限公司
Optically stimulated luminescence (OSL) is a technique that has been applied from the mid‐1980s, mainly for sediment dating. The OSL technique is based on sample stimulation by light to determine the luminescence signal that is stored in the crystal lattices of sediment grains after deposition, burial by later sediment and subsequent exposure to ionizing radiation from radioactive elements in the surrounding sediment. In such sediment dating, two parameters are required: the equivalent dose (i.e. the luminescence signal stored in the grains), and the dose rate (i.e. the ionizing energy from α, β and γ radiation emitted by naturally occurring radioisotopes in the deposit, plus the effects of cosmic radiation). In this research, the OSL technique is not used for dating. The study goal is to analyse only the luminescence signals (the total photon counts) in polymineral samples obtained after light stimulation in the blue (BLSL) and infrared (IRSL) wavelengths using a portable OSL reader designed and built at the Scottish Universities Environmental Research Centre (SUERC). Three fluvial case studies – from Cambodia, Australia and Mexico – are used to illustrate the geomorphological interpretations possible with the portable OSL reader data from sediments resulting from a range of different depositional processes. The case studies show that aspects of sediment's transport and depositional processes can be inferred from the portable OSL reader data, providing valuable insights into geomorphological history. Copyright © 2010 John Wiley & Sons, Ltd.
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