Evaluating obsidian calibration sets with portable X-Ray fluorescence (ED-XRF) instruments

Evaluating obsidian calibration sets with portable X-Ray fluorescence (ED-XRF) instruments
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使用便携式 X 射线荧光 (ED-XRF) 仪器评估黑曜石校准装置

DOI:
10.1016/j.jasrep.2021.103126
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发表时间:
2021
期刊:
Journal of Archaeological Science: Reports
影响因子:
--
通讯作者:
Duke, Daron
Duke, Daron
中科院分区:
--
文献类型:
--
作者:
Martindale Johnson, Lucas R.;Ferguson, Jeffrey R.;Freund, Kyle P.;Drake, Lee;Duke, Daron

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黑曜石的可用校准将X射线荧光(XRF)光谱数据转换为分析单位,例如百万分率或重量百分比,通过基于已知地质岩石参考(USGS和NIST)或独立矩阵匹配集(来自穆尔的Bruker和来自Yale的PYRO)的复杂算法,这些算法由其他分析方法、基于物理学的复杂原子能色散模型或两者表征。当前便携式XRF(pXRF)行业使用两种主要的百万分之一预测方法:Lucas-Tooth经验校准(基于回归)和标准基本参数。这些程序通常是特定pXRF制造商专有的,并且经常引用优越性的声明。除了这些关联,黑曜石校准集还可用于创建自己的回归校准或使用后处理斜率校正微调基本参数算法,从而通过独特的用户自定义可能会使pXRF精度复杂化,超出制造商的要求。本文回顾了校准方法,并检查了三个在使用中的pXRF仪器的校准方法和黑曜石校准集的准确性,从而独立评估制造商的准确性要求。这类研究有助于告知新用户如何在分析考古材料之前评估和披露仪器和校准精度。
Available calibrations for obsidian transform X-ray fluorescence (XRF) spectral data into analytical units such as parts per million or weight percent through complex algorithms built around known geologic rock references (USGS and NIST) or independent matrix matched sets (Bruker from MURR and PYRO from Yale) characterized by other analytical methods, complex physics-based models of atomic energy dispersion, or both. The current portable XRF (pXRF) industry uses two main part per million predictive methods: Lucas-Tooth empirical calibration (regression-based) and Fundamental Parameters with standards. These procedures are often exclusive to a given pXRF manufacturer and claims of superiority are often cited. In addition to these associations, obsidian calibration sets are also available to either create your own regression calibration or fine-tune a Fundamental Parameters algorithm using a post-processing slope correction, thus potentially complicating pXRF accuracy through unique user customizations beyond claims by the manufacturer. This paper reviews calibration methods and examines the accuracy of three in-use pXRF instruments with respect to calibration methods and obsidian calibration sets thereby independently evaluating claims of accuracy by manufacturers. Research of this kind serves to inform new users of how to evaluate and disclose instrument and calibration accuracy before the analysis of archaeological materials.
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