Empirical insights into multi-grain averaging effects from 'pseudo' single-grain OSL measurements
Empirical insights into multi-grain averaging effects from 'pseudo' single-grain OSL measurements
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DOI：
10.1016/j.radmeas.2012.02.005
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发表时间：
2012-09-01
影响因子：
2
通讯作者：
Navazo Ruiz, M.
中科院分区：
文献类型：
--
作者：
Arnold, L. J.;Demuro, M.;Navazo Ruiz, M.
在这项研究中，我们评估了一系列的沉积样品从酒店加州，阿塔普埃尔卡，西班牙的考古遗址的多颗粒平均效应的签名。我们专注于特殊情况下的等效剂量（D-e）的测量单颗粒光盘，包含一个以上的石英颗粒在每个单独的颗粒孔位置的目的（i）提供洞察的性质和程度的平均效应在非常小的多颗粒等份的沉积石英，以及（ii）评估"伪"单颗粒D-e测量对于该特定定年应用的适用性。在装有90 - 100 μ m颗粒（相当于每孔30个颗粒）的标准盘上进行的伪单颗粒OSL测量与单颗粒OSL测量相比，产生了显着不同的D-e分布特性和有限混合模型（FMM）掩埋剂量估计。异常发光行为的颗粒，这是常规拒绝在单颗粒分析，施加强大的平均效果的伪单颗粒和多颗粒等分D-E分布。伪单颗粒测量产生的颗粒孔平均效应也会产生“幻影”剂量分量，并易于提供石英信号特性和颗粒类型分类的偏差评估。虽然这是一个特定地点的研究，它作为一个警示说明其他伪单颗粒OSL和D-e数据集的解释-特别是那些从每个孔包含几十个颗粒的光盘的测量和那些来自复杂的沉积环境。在处理极细（
In this study we assess the signatures of multi-grain averaging effects for a series of sedimentary samples taken from the archaeological site of Hotel California, Atapuerca, Spain. We focus on the special case of equivalent dose (D-e) measurements made on single-grain discs that contain more than one quartz grain in each of the individual grain-hole positions with the aims of (i) providing insight into the nature and extent of averaging effects in very small multi-grain aliquots of sedimentary quartz, and (ii) assessing the suitability of 'pseudo' single-grain D-e measurements for this particular dating application. Pseudo single-grain OSL measurements made on standard discs loaded with 90-100 mu m grains (equivalent to similar to 30 grains per hole) yield significantly different D-e distribution characteristics and finite mixture model (FMM) burial dose estimates compared with single-grain OSL measurements. Grains with aberrant luminescence behaviours, which are routinely rejected during single-grain analysis, exert strong averaging effects on the pseudo single-grain and multi-grain aliquot D-e distributions. Grain-hole averaging effects arising from pseudo single-grain measurements also give rise to 'phantom' dose components and are apt to provide bias assessments of quartz signal characteristics and grain type classifications. Though this is a site-specific study, it serves as a cautionary note for interpretations of other pseudo single-grain OSL and D-e datasets - particularly those obtained from measurements of discs containing several tens of grains per hole and those derived from complex depositional environments. The use of custom single-grain discs drilled with smaller sized grain holes is recommended as a means of limiting grain-hole averaging effects when dealing with very fine (