Micro‐CT Characterization of the Chang'e‐5 Lunar Regolith Samples

作者：Huanyu Wu, Yuan Zou, Chi Zhang, Wei Yang, Bo Wu, Kai Leung Yung, Qi Zhao · 发表于：Journal of Geophysical Research Planets · 年份：2025 · DOI：10.1029/2024je008787 · 被引用次数：17 · 研究领域：Planetary Science and Exploration、Astro and Planetary Science、Scientific Research and Discoveries

Abstract Chang'e‐5 (CE‐5) lunar regolith samples were scanned using X‐ray micro‐computed tomography (micro‐CT), and over 0.7 million particles were extracted from the images through machine learning‐based segmentation. This is the largest three‐dimensional (3D) image data set on lunar regolith particles to date, offering a unique opportunity to study the key characteristics of the lunar regolith. The image intensity was correlated with mineral density, allowing for the assessment of the bulk density (1.58 g/cm 3 ), true density (3.17 g/cm 3 ), and mineralogy of the lunar regolith. Glass and plagioclase contributed 45.6 wt.% of the samples, while pyroxene and olivine made up 49.7 wt.%, and ilmenite accounted for 4.7 wt.%. The median grain size of CE‐5 was 57.5 μm, smaller than the Apollo 11, 16 and Luna 16, 20 and 24 samples. Spherical harmonic (SH) analysis and aspect ratio (AR) measurement revealed that the CE‐5 lunar regolith particles have more complex shapes than two common terrestrial soils and exhibit less spherical shapes than Apollo 11, 16 and Luna 16, 20 and 24 samples. We recommend using size and shape characteristics cautiously when inferring the lunar regolith maturity because the intrinsic crystal size of the protolith and complex lunar surface weathering can cause significant size and shape variations. Additionally, characterizing particle shapes requires a large sample size (>1,000) to prevent skewed results from outliers. Our non‐destructive examination met...