Exploring the behaviour of luminescence signals from feldspars: Implications for the single aliquot regenerative dose protocol
Exploring the behaviour of luminescence signals from feldspars: Implications for the single aliquot regenerative dose protocol
复制标题
DOI：
10.1016/j.radmeas.2017.07.005
复制
发表时间：
2018-02-01
影响因子：
2
通讯作者：
Roberts, H. M.
中科院分区：
文献类型：
--
作者：
Colarossi, D.;Duller, G. A. T.;Roberts, H. M.
采用单一等温再生剂量（SAR）方案对富钾长石颗粒进行了一系列剂量恢复实验，测量了红外后红外激发发光（post-IR IRSL）信号。成功恢复实验室剂量的能力取决于所使用的试验剂量的大小。结果表明，使用当前的SAR方案，对测试剂量的发光响应（T-x）的大小取决于来自先前再生剂量的发光信号（L-x）的大小，因为在测量L-x结束时，ir后的IRSL信号没有降低到低水平。再生剂量产生的电荷被转移到T-x的测量中。当试验剂量较小时（即给定剂量的1%-15%），这种电荷的携带支配了试验剂量产生的信号。在这种情况下，T-x不是灵敏度变化的准确度量。不幸的是，由于电荷的携带与再生剂量产生的信号的大小紧密耦合，诸如再循环之类的标准测试将无法识别灵敏度校正的这种失败。电荷的结转是由于在测量过程中难以从长石中去除ir后的IRSL信号，这与最初设计SAR协议的石英的光激发发光（OSL）信号的快速成分形成鲜明对比。(C) 2017年作者。Elsevier Ltd.出版。
A series of dose recovery experiments are undertaken on grains of potassium-rich feldspar using a single aliquot regenerative dose (SAR) protocol, measuring the post-infrared infrared stimulated luminescence (post-IR IRSL) signal. The ability to successfully recover a laboratory dose depends upon the size of the test dose used. It is shown that using current SAR protocols, the magnitude of the luminescence response (T-x) to the test dose is dependent upon the size of the luminescence signal (L-x) from the prior regeneration dose because the post-IR IRSL signal is not reduced to a low level at the end of measuring L-x. Charge originating from the regeneration dose is carried over into measurement of T-x. When the test dose is small (i.e. 1%-15% of the given dose) this carry-over of charge dominates the signal arising from the test dose. In such situations, T-x is not an accurate measure of sensitivity change. Unfortunately, because the carry-over of charge is so tightly coupled to the size of the signal arising from the regeneration dose, standard tests such as recycling will not identify this failure of the sensitivity correction. The carry-over of charge is due to the difficulty of removing the post-IR IRSL signal from feldspars during measurement, and is in stark contrast with the fast component of the optically stimulated luminescence (OSL) signal from quartz for which the SAR protocol was originally designed. (C) 2017 The Authors. Published by Elsevier Ltd.