The XRF-CT technique continues to gain attention with respect to both its development and applications. The emergence of fast scanning approaches in conjunction with ED-detectors of high counting rate capability has allowed XRF-CT to evolve towards a truly 3D elemental imaging technique. At SR sources, the technique is regularly applied at sub-μm resolution together with complementary imaging modalities such as absorption and phase-contrast CT, XRD-CT, 2D/3D XAS and ptychography. The TXRF spectrometric analysis of suspensions and undigested samples (e.g. clay, cosmetics and nanoparticles) continues to receive much attention. In the analysis of fly ash samples, elemental sensitivities were affected by the angle of the measurement. In the use of TXRF spectrometry for the analysis of particle-like large specimens, the influence of the standing wave field was considered to be negligible. However, more work needs to be done on this source of uncertainty to improve our understanding of the influence of the standing wave field on these kind of samples. Novel equipment capable of very good angle resolution will be useful for such studies. Pre-concentration procedures are becoming more sophisticated with the introduction of new substrates for ligands capable of binding heavy metals and, in some cases, of being applied directly on the TXRF spectrometry reflector for immediate analysis. A sophisticated explanation of the excitation spectrum reported for μ-XRF spectrometry included a new description of the energy distribution of electrons in the target. Another highlight was the application of high-resolution monochromatic μ-XRF spectrometry using DCC optics for excitation and focusing as well as for increasing the spectral resolution of the Pu and U L-lines. Although the use of portable XRF spectrometry systems is now well established, new dedicated systems continue to be developed including those with a triaxial configuration. The focus is now primarily on the development and use of portable TXRF spectrometry systems for an expanding range of applications. In the area of cultural heritage applications, macroXRF spectrometry is a well-established imaging technique for the analysis of paintings that is now also being used to image stained-glass panels. The extensive study using a number of micro- and macro-techniques of Vermeer’s painting of The Girl with a Pearl Earring illustrated the power of this approach. Not only could the different shades of blue in the painting be characterised but also the materials and techniques used to achieve various effects in the painting.

中文翻译：

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2020年原子光谱法更新–回顾X射线荧光光谱法及其特殊应用的进展

XRF-CT技术在其开发和应用方面都继续受到关注。快速扫描方法与高计数率功能的ED检测器的结合使XRF-CT朝着真正的3D元素成像技术发展。在SR光源上，该技术通常以亚微米级的分辨率以及互补的成像方式（例如吸收和相衬CT，XRD-CT，2D / 3D XAS和色谱图）一起应用。悬浮液和未消化样品的TXRF光谱分析（例如粘土，化妆品和纳米颗粒）继续受到广泛关注。在粉煤灰样品的分析中，元素敏感性受测量角度的影响。在使用TXRF光谱分析颗粒状大样本时，驻波场的影响可以忽略不计。但是，在这种不确定性源上还需要做更多的工作，以增进我们对驻波场对此类样本影响的理解。具有良好角度分辨率的新型设备将对此类研究有用。随着用于配体的新底物的引入，预浓缩程序变得越来越复杂，这些底物能够结合重金属，并且在某些情况下，可以直接应用于TXRF光谱反射器上进行即时分析。对μ-XRF光谱报告的激发光谱的详尽解释包括对靶中电子能量分布的新描述。另一个亮点是使用DCC光学器件的高分辨率单色μ-XRF光谱在激发和聚焦以及提高Pu和U L线的光谱分辨率方面的应用。尽管现在已经很好地使用了便携式XRF光谱系统，但仍在继续开发新的专用系统，包括具有三轴配置的系统。现在，重点主要放在便携式TXRF光谱仪系统的开发和使用上，以扩展其应用范围。在文化遗产应用领域，macroXRF光谱仪是一种用于分析绘画的成熟成像技术，现在也用于对彩色玻璃板成像。广泛的研究使用了维米尔（Vermeer）的绘画《戴珍珠耳环的女孩》的许多微观和宏观技术，说明了这种方法的力量。不仅可以表征绘画中不同的蓝色阴影，还可以表征用于实现绘画中各种效果的材料和技术。