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首页> 外文期刊>Quaternary geochronology >Characterising the luminescence behaviour of 'infinitely old' quartz samples from Switzerland
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Characterising the luminescence behaviour of 'infinitely old' quartz samples from Switzerland

机译：从瑞士'无限旧的石英样品的发光行为

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Less than 20% of aliquots measured for a set of 'infinitely old' quartz samples (i.e. burial time 1 Ma) from the northern Alpine foreland of Switzerland were found to display a natural signal that was in saturation. The signals from small aliquots displayed a range of saturation levels of between similar to 300 and 600 Gy and dose recovery tests were successful up to 350 Gy. A comparison of dose response curves and test-dose response for a single-aliquot regenerative-dose (SAR) and a sensitivity-corrected multiple-aliquot regenerative-dose (SC-MAR) protocols, showed similar growth and sensitivity. The addition of a large laboratory dose was able to bring the natural signals into saturation, and no evidence was found to suggest that the unsaturated signals were due to a problem with the SAR protocol. While laboratory isothermal decay measurements confirmed that the lifetime of the luminescence signal was insufficient beyond 1 Ma, a correction for the thermal loss of signal confirmed that natural signals should still be in saturation, and that thermal instability alone cannot explain the unsaturated signals. Fading tests recorded athermal loss of signal, and higher g-values displayed a significant correlation with lower levels of signal saturation. A combination of thermal and athermal loss of the signal is understood to be responsible for the unsaturated signals in these infinitely old samples. Extensive isothermal decay measurements revealed a surprisingly broad range of lifetimes for the quartz signals of over two orders of magnitude within the studied samples, and this was also observed in several batches of calibration quartz. While machine repeatability was shown to explain part of the observed variability, further work is encouraged on samples from other regions to establish the major source of the spread, and caution is recommended before making lifetime comparisons between studies and settings. (C) 2017 Elsevier B.V. All rights reserved.
机译：发现了瑞士北部阿尔卑斯州前沿的一组“无限旧的”石英样品（即埋葬时间＆ 1 ma）测量的等分试样的等分试样的等分试样显示出饱和度的自然信号。来自小等分试样的信号显示在类似于300和600 GY之间的饱和水平范围，并且剂量回收测试成功至350 Gy。对单点调味剂量（SAR）和灵敏度校正的多重等分试样再生剂（SC-MAR）方案的剂量响应曲线和试验剂量反应的比较显示出类似的生长和敏感性。添加大实验室剂量能够将自然信号带入饱和度，并且没有发现任何证据表明不饱和信号是由于SAR方案的问题。虽然实验室等温衰减测量结果证实，发光信号的寿命不足超过1 mA，但是对信号的热丧失的校正确认了天然信号仍然存在饱和度，并且单独的热不稳定性不能解释不饱和的信号。衰落测试记录了信号的动脉丧失，并且较高的G值显示出与较低的信号饱和度水平的显着相关性。信号的热量和动脉丧失的组合应理解为负责这些无限旧样品中的不饱和信号。广泛的等温衰减测量显示了在研究样本中超过两个数量级的石英信号的令人惊讶的广泛寿命，并且在几批校准石英中也观察到这一点。虽然机器重复性被证明是解释了观察到的可变性的一部分，但在其他地区的样本上鼓励进一步的工作，以建立传播的主要来源，并且在进行研究与环境之间的终身比较之前建议谨慎。 （c）2017 Elsevier B.v.保留所有权利。

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