Vincze Laszlo, Vekemans Bart, Brenker Frank E, Falkenberg Gerald, Rickers Karen, Somogyi Andrea, Kersten Michael, Adams Freddy
MiTAC, University of Antwerp, Universiteitsplein 1, B-2610 Wilrijk, Belgium.
Anal Chem. 2004 Nov 15;76(22):6786-91. doi: 10.1021/ac049274l.
A three-dimensional (3D) variant of scanning micro X-ray fluorescence (XRF) is described and evaluated at the ID18F instrument of the European Synchrotron Radiation Facility (ESRF). The method is based on confocal excitation/detection using a polycapillary half-lens in front of the energy-dispersive detector. The experimental arrangement represents a significant generalization of regular two-dimensional (2D) scanning micro-XRF and employs a detector half-lens whose focus coincides with that of the focused incoming beam. The detection volume defined by the intersection of the exciting beam and the energy-dependent acceptance of the polycapillary optics is 100-350 mum(3). Minimum detection limits are sub-ppm, and sensitivities are comparable with regular scanning XRF. Next to the reduction of in-sample single/multiple scattering, the setup provides the possibility of sample depth scans with an energy-dependent resolution of 10-35 mum in the energy range of 3-23 keV and the possibility of performing 3D-XRF analysis by simple XYZ linear scanning. This provides a suitable alternative to X-ray fluorescence tomography. The method is illustrated with results of the analysis of solid inclusions in diamond and fluid inclusions in quartz.
本文描述并评估了一种三维（3D）扫描微X射线荧光（XRF）技术，该技术在欧洲同步辐射装置（ESRF）的ID18F仪器上进行了测试。该方法基于共焦激发/检测，在能量色散探测器前使用了一个聚束半透镜。这种实验装置是对常规二维（2D）扫描微XRF的重大拓展，采用了一个探测器半透镜，其焦点与聚焦入射光束的焦点重合。由激发光束与聚束光学器件的能量相关接收区域相交定义的检测体积为100-350立方微米。最低检测限为亚ppm级，灵敏度与常规扫描XRF相当。除了减少样品内的单次/多次散射外，该装置还提供了在3-23 keV能量范围内进行样品深度扫描的可能性，能量相关分辨率为10-35微米，并且可以通过简单的XYZ线性扫描进行3D-XRF分析。这为X射线荧光断层扫描提供了一种合适的替代方法。本文通过对金刚石中的固体包裹体和石英中的流体包裹体的分析结果来说明该方法。
