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首页> 外文期刊>Quaternary geochronology >Direct measurement of the fast component of quartz optically stimulated luminescence and implications for the accuracy of optical dating
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Direct measurement of the fast component of quartz optically stimulated luminescence and implications for the accuracy of optical dating

机译：直接测量石英光学激发发光的快速成分及其对光学测年精度的影响

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The usual practice in optical dating is to derive an equivalent dose (D_e) (and hence age) from integration of the initial part of the measured optically stimulated luminescence (OSL) signal. This 'bulk' OSL signal is known to comprise several semi-independent components, each of which decays at different rates during measurement, and thus contributes a different proportion to the bulk signal as measurement time progresses. Data are presented here which show a strong dependence of D_e on the bulk signal integration interval, with reduced D_e for later signal integration intervals resulting from lower medium component D_e values. This dependence leads to two problems: (i) deciding which signal integral to choose, and (ii) the possibility that all bulk signals will provide systematic age underestimation due to medium component signal contributions. Isolating the fast component of the bulk OSL signal provides a solution to both problems and several methods of achieving this are assessed; an efficient new method is described which is incorporated in to standard single-aliquot regenerative-dose measurement sequences. This method involves the direct measurement of the fast-component signal using infrared (830. nm) stimulation of quartz at 160°C, prior to the standard bulk OSL measurement with 470. nm stimulation. It is shown that the measured quartz infrared stimulated luminescence signals resolve pure fast-component signals and provide D_e estimates consistent with those from signal deconvolution. This approach can only be applied to samples with relatively bright luminescence emissions, but in these cases is expected to provide a more robust estimate of palaeodose.
机译：光学测年法的通常做法是从所测得的光学激发发光（OSL）信号的初始部分的积分中得出等效剂量（D_e）（并由此得出年龄）。众所周知，这种“整体” OSL信号包括几个半独立的分量，每个分量在测量过程中以不同的速率衰减，因此随着测量时间的延长，其与整体信号的比例不同。此处显示的数据显示D_e对体信号积分间隔的强烈依赖性，而D_e对于较低的中等分量D_e值会导致以后的信号积分间隔减小。这种依赖性导致两个问题：（i）决定选择哪个信号积分，（ii）由于中等分量信号的贡献，所有体信号将提供系统的年龄低估的可能性。隔离大量OSL信号的快速分量可为两个问题提供解决方案，并评估了实现此问题的几种方法。描述了一种有效的新方法，该方法被并入标准的单等分再生剂量测量序列中。此方法涉及在160°C下使用石英的红外（830.nm）刺激直接测量快速分量信号，然后再进行470.nm刺激的标准体OSL测量。结果表明，所测得的石英红外激发的发光信号可解析纯快成分信号，并提供与信号去卷积得到的D_e估计一致的估计。这种方法只能应用于发光发射相对较亮的样品，但是在这些情况下，有望提供更可靠的帕洛阿多糖估计。

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