The cover image is based on Photomicrographs of different grain size and textured rock slabs analyzed by PIXE at Guelph, Canada. APXS analyzes a mudstone rock during the Mars Science Laboratory mission; APXS Image Credit: NASA/JPL‐Caltech/MSSS) included in the Original Article Powdered rock versus solid rock comparisons in PIXE measurements for planetary geochemical exploration by Erin L. Flannigan et al., https://doi.org/10.1002/xrs.3172.

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封面图片

封面图像基于加拿大Guelph的PIXE分析的不同晶粒尺寸和纹理岩石平板的显微照片。APXS在火星科学实验室执行任务期间分析了一块泥岩。APXS图片来源：NASA / JPL-Caltech / MSSS）包含在  Erin L. Flannigan等人在进行地球化学勘探的PIXE测量中，将粉末状岩石与固体岩石进行比较，https：//doi.org/10.1002/xrs .3172。