Kappen P, Arhatari B D, Luu M B, Balaur E, Caradoc-Davies T
Department of Physics, La Trobe University, Victoria 3086, Australia.
Rev Sci Instrum. 2013 Jun;84(6):063703. doi: 10.1063/1.4810011.
This study realizes the concept of simultaneous micro-X-ray computed tomography and X-ray powder diffraction using a synchrotron beamline. A thin zinc metal foil was placed in the primary, monochromatic synchrotron beam to generate a divergent wave to propagate through the samples of interest onto a CCD detector for tomographic imaging, thus removing the need for large beam illumination and high spatial resolution detection. Both low density materials (kapton tubing and a piece of plant) and higher density materials (Egyptian faience) were investigated, and elemental contrast was explored for the example of Cu and Ni meshes. The viability of parallel powder diffraction using the direct beam transmitted through the foil was demonstrated. The outcomes of this study enable further development of the technique towards in situ tomography∕diffraction studies combining micrometer and crystallographic length scales, and towards elemental contrast imaging and reconstruction methods using well defined fluorescence outputs from combinations of known fluorescence targets (elements).
本研究利用同步辐射光束线实现了同步微X射线计算机断层扫描和X射线粉末衍射的概念。将一片薄锌金属箔置于初级单色同步辐射光束中，以产生发散波，该发散波穿过感兴趣的样品传播到电荷耦合器件（CCD）探测器上进行断层成像，从而无需大光束照明和高空间分辨率检测。研究了低密度材料（聚酰亚胺管和一片植物）和高密度材料（埃及彩釉陶），并以铜网和镍网为例探讨了元素对比度。证明了使用透过箔片的直射光束进行平行粉末衍射的可行性。本研究结果有助于该技术进一步发展，用于结合微米尺度和晶体学长度尺度的原位断层扫描/衍射研究，以及利用已知荧光靶标（元素）组合产生的明确定义的荧光输出进行元素对比度成像和重建方法的研究。
