X-ray Fluorescence Nanotomography on Cometary Matter from Comet 81P/Wild2 Returned by Stardust
X-ray Fluorescence Nanotomography on Cometary Matter from Comet 81P/Wild2 Returned by Stardust
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DOI：
10.1021/ac900507x
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发表时间：
2009-07
影响因子：
7.4
通讯作者：
G. Silversmit;B. Vekemans;F. Brenker;S. Schmitz;M. Burghammer;C. Riekel;L. Vincze
中科院分区：
文献类型：
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作者：
G. Silversmit;B. Vekemans;F. Brenker;S. Schmitz;M. Burghammer;C. Riekel;L. Vincze
利用一种显著改进的亚微米空间分辨率X射线荧光层析成像方法，在200 nm的空间分辨率水平上测量了美国国家航空航天局(NASA)S星尘任务带来的一个独特的(∼2μm)彗星彗星粒子内从钙到硒的主要和微量元素的全三维(3D)分布。这些测量是基于同步辐射XRF纳米层析成像，该成像应用于位于气凝胶主体中的终端粒子，用于捕获太空中的彗星和星际颗粒。使用对称的双探测器布置进行纳米XRF层析成像测量，180°的旋转角对于层析重建是足够的。开发了专用的校正算法来校正由于样品定位系统在数据收集期间的不稳定性而引起的断层扫描数据集中的亚微米级别的失真。
Using a significantly improved method for X-ray fluorescence (XRF) tomography with submicrometer spatial resolution, the fully three-dimensional (3D) distribution of main and trace elements from calcium to selenium was determined at a spatial resolution level of 200 nm within a unique (∼2 μm) comet coma particle brought to Earth by the National Aeronautical and Space Administration (NASA)’s Stardust mission. The measurements were based on synchrotron radiation XRF nanotomography that has been applied to the terminal particle located in an aerogel host, which was used to capture comet and interstellar grain particles in space. Using a symmetric dual-detector arrangement for the presented nano-XRF tomography measurements, a rotation angle of 180° was sufficient for the tomographic reconstruction. Dedicated correction algorithms were developed to correct for submicrometer-level distortions within the tomographic dataset arising from instabilities of the sample positioning system during data collection.