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首页> 外文期刊>Quaternary geochronology >Optically stimulated luminescence dating of heat retainer hearths from the Sahara: Insights into signal accumulation and measurement
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Optically stimulated luminescence dating of heat retainer hearths from the Sahara: Insights into signal accumulation and measurement

机译：光学刺激从撒哈拉的热固定器壁炉的发光约会：洞察信号累积和测量

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摘要

Heat retainer hearths are a prominent component of the Holocene archaeological record of a number of dry lands. Rocks within these hearths were fired in antiquity, emptying the optically stimulated luminescence (OSL) source traps of mineral grains within the rock. Since partial bleaching and mixing of grains within a lithified heat retainer is impossible, these rocks offer the opportunity to test our understanding of OSL signal accumulation and measurement processes. First, we show that OSL ages calculated using grains size fractions from 4 to 11 gm up to 180-210 mu m are indistinguishable for a single heat retainer, indicating that the environmental and instrumental dose rate correction factors routinely used in luminescence dating are accurate. Second, we used single-grain dose recovery and equivalent dose measurements to determine the overdispersion due to beta microdosimetry. For the heat retainers measured in this study, overdiseprsion due to beta microdosimetry ranges from 8.9 +/- 1.8 to 20.3 +/- 1.6%. Third, we investigate the impact of mechanical crushing on the measured equivalent dose from quartz, to test the potential of using this technique to liberate dateable material from heat retainers which are not acid soluble. A small ( 1 Gy) but significant increase in equivalent dose is observed in crushed zero-age samples, but the equivalent doses of crushed and uncrushed Holocene quartzes are indistinguishable. We conclude that crushing is a viable method for extracting dateable material from a heat retainer, but that some knowledge of the dosimeter's mean grain size is required for calculation of an accurate environmental dose rate.
机译：热保持器壁炉是全新世考古记录的突出成分，众多干陆。这些壁炉内的岩石被造成古代，清空岩石内的光学刺激的发光（OSL）源粒源陷阱。由于不可能的粒子内漂白和混合谷物，因此这些岩石提供了测试我们对OSL信号累积和测量过程的理解的机会。首先，我们表明，使用4-11克的粒度计算的OSL年龄可达180-210μm，对于单个热固定器来说是难以区分的，表明在发光约会中常规使用的环境和仪器剂量速率校正因子是准确的。其次，我们使用单粒剂量回收和等效剂量测量来确定由于β微骨二滴定法引起的过度分散。对于在本研究中测量的热固化器，由于β微掺入率为8.9 +/- 1.8至20.3 +/- 1.6％的过度。第三，我们研究机械压碎对石英测量的当量剂量的影响，以测试使用该技术从不酸可溶的热保持器释放可调材料的电位。在压碎的零龄上样品中观察到较小的（＆ 1 gy）但相当剂量的显着增加，但是碎屑和未被卷积的全茂石墨的等同剂量是难以区分的。我们得出结论，压碎是一种可行的方法，用于从热固定器中提取可长期材料，但是需要对剂量表的平均晶粒尺寸的一些了解来计算精确的环境剂量率。

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