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Natural saturation of OSL and TT-OSL signals of quartz grains from Nilotic origin

机译：OSL的自然饱和度和TT-OSL信号从不良原点的石英谷物的信号

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摘要

The upper limit of optically stimulated luminescence (OSL) dating technique is usually defined by signal saturation. In nature the OSL signal saturates even faster than in the laboratory. Here we present a study on natural saturation of OSL and thermally transferred OSL (TT-OSL) signals of quartz grains from Nilotic origin. Quartz samples from two representative sections from the coastal plain of Israel, and which span approximately similar time frames, were used to construct semi-natural dose response curves (DRC) for OSL and TT-OSL by plotting the natural signal of samples against their depth and equivalent dose (De). Samples from these two sections, as well as from other sites, define typical OSL and TT-OSL DRC's for Nilotic quartz that was transported to the eastern shores of the Mediterranean Sea. The constructed semi-natural OSL DRC is unique to the quartz of Nilotic origin and indicates the upper limit for reliable OSL dating of this quartz at 140 Gy due to signal saturation. The natural TT-OSL luminescence grows linearly up to 400 Gy, and is constant for 400-600 Gy. Steady-state between TT-OSL trap-filling, due to ionizing radiation, and concurrent thermal emptying of these traps is achieved at 600 Gy. TT-OSL dating of the Nilotic quartz is expected to underestimate ages over similar to 120 ka due to the low thermal stability of the signal.
机译：光学刺激的发光（OSL）约会技术的上限通常通过信号饱和来定义。在自然中，OSL信号甚至比实验室更快。在这里，我们展示了来自无聊来源的氧化镁的自然饱和和石英粒的热转移OSL（TT-OSL）信号的研究。来自以色列沿海平原的两个代表性部分的石英样本，并且跨越大致相似的时间框架，用于通过绘制对其深度的自然信号来构建osl和tt-osl的半天然剂量响应曲线（DRC）和等同剂量（de）。来自这两个部分的样本以及来自其他网站，定义典型的OSL和TT-OSL DRC，用于运输到地中海的东部海岸的不良石英。构造的半天然OSL DRC对不良原点的石英是独一无二的，并且由于信号饱和度导致140 GY的可靠OSL约会的可靠OSL约会的上限。天然TT-OSL发光，长达400倍，恒定为400-600 GY。 TT-OSL陷阱之间的稳态，由于电离辐射，这些陷阱的并发热排空是在600 GY实现的。由于信号的低热稳定性，预计UNICORIC Quartz的TT-OSL约会是低于相似到120 ka的年龄。

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