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Is there a common alpha-efficiency in polymineral samples measured by various infrared stimulated luminescence protocols?
Geochronometria ( IF 0.8 ) Pub Date : 2018-08-11 , DOI: 10.1515/geochr-2015-0095
Christoph Schmidt , Janina Bösken , Thomas Kolb

Abstract Dating of polymineral silt-sized samples by use of post-infrared infrared stimulated luminescence (pIRIR) protocols at elevated temperature has recently gained attraction due to assumed lower rates of anomalous fading. The α-efficiency (or a-value) associated with the pIRIR signals as an integral part of age calculation has, however, not yet been sufficiently constrained. Here we present a set of 65 a-values determined for 47 samples collected across Europe with two different IRSL protocols in two laboratories. By testing the basic preconditions for application of the single-aliquot regeneration (SAR) procedure to constrain a-values and by comparing SAR results to a-values obtained by multiple-aliquot protocols, we demonstrate that SAR-derived a-values are reliable for the majority of samples. While aliquot size and signal resetting mode prior to α-regeneration do not appear to affect the resulting a-value, we detected significant differences in mean a-values measured in the two laboratories. For the pIRIR290 signal, a-values average to 0.085 ± 0.010 (Bayreuth) and 0.101 ± 0.014 (Cologne), while a modified SAR protocol yields 0.081 ± 0.008 (Bayreuth). Whereas provenance-specific differences in a-values might be masked by overall scatter, systematic offsets between laboratories are attributed to technical issues such as heater and source calibration. Based on the present data set, use of the same routine dating equipment is strongly advised for both dose and a-value measurements.

中文翻译:

通过各种红外受激发光协议测量的多矿物样品中是否存在共同的 α 效率?

摘要 由于假定的异常褪色率较低,在高温下使用后红外红外受激发光 (pIRIR) 协议对多矿物淤泥大小的样品进行测年最近受到了关注。然而,作为年龄计算的一个组成部分,与 pIRIR 信号相关的 α 效率(或 a 值)尚未得到充分限制。在这里,我们展示了一组 65 个 a 值,这些 a 值是为在欧洲的两个实验室中使用两种不同的 IRSL 协议收集的 47 个样本确定的。通过测试应用单等分再生 (SAR) 程序来约束 a 值的基本先决条件,并将 SAR 结果与通过多等分协议获得的 a 值进行比较,我们证明了 SAR 衍生的 a 值对于大多数样本。虽然 α 再生之前的等分试样大小和信号重置模式似乎不会影响产生的 a 值,但我们检测到在两个实验室中测量的平均 a 值存在显着差异。对于 pIRIR290 信号,a 值平均为 0.085 ± 0.010(拜罗伊特)和 0.101 ± 0.014(科隆),而修改后的 SAR 协议产生 0.081 ± 0.008(拜罗伊特)。尽管 a 值中特定于出处的差异可能会被整体散射掩盖,但实验室之间的系统偏移归因于技术问题,例如加热器和源校准。根据目前的数据集,强烈建议使用相同的常规测年设备进行剂量和 a 值测量。对于 pIRIR290 信号,a 值平均为 0.085 ± 0.010(拜罗伊特)和 0.101 ± 0.014(科隆),而修改后的 SAR 协议产生 0.081 ± 0.008(拜罗伊特)。尽管 a 值中特定于出处的差异可能会被整体散射掩盖,但实验室之间的系统偏移归因于技术问题,例如加热器和源校准。根据目前的数据集,强烈建议使用相同的常规测年设备进行剂量和 a 值测量。对于 pIRIR290 信号,a 值平均为 0.085 ± 0.010(拜罗伊特)和 0.101 ± 0.014(科隆),而修改后的 SAR 协议产生 0.081 ± 0.008(拜罗伊特)。尽管 a 值中特定于出处的差异可能会被整体散射掩盖,但实验室之间的系统偏移归因于技术问题,例如加热器和源校准。根据目前的数据集,强烈建议使用相同的常规测年设备进行剂量和 a 值测量。
更新日期:2018-08-11
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