A very bright and long bolide was observed over the eastern part of the Czech Republic during late local evening on December 9, 2014. This bolide was recorded by professional instruments in the Czech part of the European Fireball Network. Three meteorites weighing in total 87 g were found in the predicted area and were named Žďár nad Sázavou. The complete material composition of the meteorite was obtained from one cut‐off piece using petrography, mineralogy, and scanning electron microscopy (together with X‐ray energy dispersive spectroscopy and wavelength dispersive spectroscopy). X‐ray computed tomography (CT ) was applied on all pieces for the determination of their grain and bulk density, digitization of shape, and examination of the structural homogeneity. CT has proved its important role for nondestructive exploration of brecciated meteorites formed by distinct lithologies or petrological types. In this article, we discuss its limits in terms of structural and material resolution based on the correlation of state‐of‐the‐art CT data and SEM images. Furthermore, we introduce a new way of air cavity quantification, which distinguishes the natural porosity of meteorite and cracks related to erosion processes. This helps to discuss the presence of weathering products based on comparison of the meteorite pieces found at different times after impact.

中文翻译：

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利用计算机断层扫描技术分析ŽďárnadSázavouL球粒陨石的化学和物理特性

2014年12月9日晚间，在捷克东部东部观测到非常明亮而长的硼化物。该硼化物是由专业仪器在欧洲火球网的捷克部分记录的。在预测的区域内发现了三颗陨石，总重达87 g，被命名为ŽďárnadSázavou。陨石的完整材料成分是使用岩石学，矿物学和扫描电子显微镜（连同X射线能量色散光谱法和波长色散光谱法）从一个切割件中获得的。将X射线计算机断层扫描（CT）用于所有部件，以确定其颗粒和堆积密度，形状数字化以及检查结构均匀性。CT已经证明了其对由不同岩性或岩石学类型形成的角砾陨石的非破坏性勘探的重要作用。在本文中，我们将根据最新的CT数据和SEM图像的相关性，讨论其在结构和材料分辨率方面的局限性。此外，我们引入了一种新的气腔量化方法，该方法可以区分陨石的自然孔隙率和与侵蚀过程有关的裂纹。通过比较撞击后不同时间发现的陨石碎片，这有助于讨论风化产物的存在。我们介绍了一种新的气腔定量方法，该方法可以区分陨石的自然孔隙度和与侵蚀过程相关的裂纹。通过比较撞击后不同时间发现的陨石碎片，这有助于讨论风化产物的存在。我们介绍了一种新的气腔定量方法，该方法可以区分陨石的自然孔隙度和与侵蚀过程相关的裂纹。通过比较撞击后不同时间发现的陨石碎片，这有助于讨论风化产物的存在。