M. Martini, P. Francus, L. Di Schiavi Trotta, P. Letellier, M. Des Roches, P. Després
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引用次数: 0
摘要
双能 X 射线计算机断层扫描是利用两束不同能量的入射 X 射线对物体进行成像,从而根据密度(电子密度,ρe)和元素组成(有效原子序数,Zeff)区分样品中的不同化合物。双能量 X 射线计算机断层扫描的化学计量校准已成功应用于简单、非破坏性地识别单一和均质矿物。本文首次将其应用于一个更加复杂和异质的样本,即具有三个不同面的变异沉积岩芯。双能 X 射线计算机断层扫描的输出结果与使用微型 XRF 岩心扫描仪在相同分辨率下获得的元素地球化学结果进行了比较。使用双能 X 射线计算机断层扫描可以成功地区分三个不同的岩层面,因为它们的 ρe 和 Zeff 值范围允许对它们进行区分。论文还讨论了与元素地球化学的相关性,但不太确定,这可能是由于粒度和孔隙度的变化,以及这些高分辨率分析不是在完全相同的位置进行的。本文不仅最终讨论了在沉积物上使用双能 X 射线计算机断层扫描时的局限性,而且还展示了它以非破坏性方式定量研究沉积物岩心的潜力。
Exploring the application of dual-energy CT to discriminate sediment facies in a varved sequence
Dual-energy X-ray computed tomography consists of imaging objects using two incident X-ray beams of different energy to distinguish the different compounds within a sample based on their density (electron density, ρe) and elemental composition (effective atomic number, Zeff). The stoichiometric calibration for dual-energy X-ray computed tomography was already successfully implemented to identify single and homogeneous minerals easily and non-destructively. It is here applied for the first time to a more complex and heterogeneous sample, a varved sediment core with three distinct facies. The output of dual-energy X-ray computed tomography was compared against elemental geochemistry obtained at the same resolution using a micro-XRF core scanner. The three individual facies can be successfully differentiated using dual-energy X-ray computed tomography because their range of ρe and Zeff values allow their discrimination. Correlations with elemental geochemistry are also discussed but are less conclusive, probably because of variations in grain size and porosity, and because these high resolution analyses were not performed at the exact same location. The paper not only eventually discusses the limitations when using dual-energy X-ray computed tomography on sediments but also demonstrates its potential to quantitatively study sediment cores in a non-destructive way.