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Characterization of a system that combines energy dispersive X-ray diffraction with X-ray fluorescence and its potential applications in archeometry

机译:结合能量色散X射线衍射和X射线荧光的系统的表征及其在考古学中的潜在应用

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摘要

We report a proof of concept constructing an experimental setup to explore the imaging capability of a single X-ray detector, simulating a pixelated X-ray detector, to measure EDXRF (Energy Dispersive X-ray Fluorescence) and EDXRD (Energy Dispersive X-ray Diffraction) image spectra simultaneously. Combining a conventional rotating anode Cu X-ray source and assembling a single X-ray detector (Si-PIN Amptek, 139eV at 5.98keV) on a computer controlled XY stage, a proxy of an imaging X-ray detector was constructed for the measurement of simultaneous EDXRD and EDXRF of the same spot of a sample. The main advantages of this setup are the virtual need for sample preparation and the simultaneous XRF-XRD measurements of the same spot, enabling a combined and consistent analysis of a sample. The time consumed in an analysis using this setup is largely due to the need for acquiring multiple (several hundred) single spectra, which can be compensated, by using a variable acquisition time, depending on the count rate, exploring the high dynamic range of the X-ray emission during data acquisition. A Python code was written for offline data filtering and analysis. Using a simple geometrical model, d-spacings were calculated, and the model predictions were superimposed to the ED (Energy Dispersive) surface plots with good agreement. The instrument proved to work according to expectations and helped set the main experimental parameters for a more compact and portable setup under development.
机译:我们报告了构建实验装置的概念证明,以探索单个X射线探测器的成像能力,模拟像素化X射线探测器,测量EDXRF(能量色散X射线荧光)和EDXRD(能量色散X射线)衍射)图像光谱同时进行。结合传统的旋转阳极Cu X射线源并在计算机控制的XY平台上组装单个X射线检测器(Si-PIN Amptek,139eV,5.98keV),构建了成像X射线检测器的代理进行测量样品同一点的同时EDXRD和EDXRF的分布。这种设置的主要优点是实际上需要样品制备,并且可以同时对同一点进行XRF-XRD测量,从而可以对样品进行组合且一致的分析。使用此设置进行分析所花费的时间主要是由于需要获取多个(数百个)单光谱,可以通过使用可变的采集时间(取决于计数率)来探索高动态范围,从而对这些光谱进行补偿。数据采集​​期间的X射线发射。编写了Python代码以进行离线数据过滤和分析。使用简单的几何模型,计算d间距,并将模型预测结果与ED(能量分散)表面图叠加,并具有良好的一致性。事实证明该仪器能够按预期工作,并帮助设置了主要的实验参数,从而使开发中的设备更加紧凑和便携。

著录项

  • 来源
    《Journal of Applied Physics》 |2019年第4期|044901.1-044901.9|共9页
  • 作者单位

    Univ Sao Paulo, Inst Phys, Rua Matao 1371, Sao Paulo, Brazil;

    Univ Sao Paulo, Inst Phys, Rua Matao 1371, Sao Paulo, Brazil;

    Univ Sao Paulo, Inst Phys, Rua Matao 1371, Sao Paulo, Brazil;

    Univ Sao Paulo, Inst Phys, Rua Matao 1371, Sao Paulo, Brazil;

    Univ Sao Paulo, Inst Phys, Rua Matao 1371, Sao Paulo, Brazil;

    Univ Sao Paulo, Inst Phys, Rua Matao 1371, Sao Paulo, Brazil;

    Univ Sao Paulo, Inst Phys, Rua Matao 1371, Sao Paulo, Brazil;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-18 04:27:57

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