Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Stan, Camelia V.; Tamura, Nobumichi

doi:10.3791/57874

Title: Synchrotron X-ray Microdiffraction and Fluorescence Imaging of Mineral and Rock Samples

Journal Article · 23 May 2018 · Journal of Visualized Experiments

DOI: https://doi.org/10.3791/57874 · OSTI ID:1462004

Stan, Camelia V. ^[1]; Tamura, Nobumichi ^[1]

Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

In this paper, we describe a detailed procedure for acquiring and processing x-ray microfluorescence (μXRF), and Laue and powder microdiffraction two-dimensional (2D) maps at beamline 12.3.2 of the Advanced Light Source (ALS), Lawrence Berkeley National Laboratory. Measurements can be performed on any sample that is less than 10 cm x 10 cm x 5 cm, with a flat exposed surface. The experimental geometry is calibrated using standard materials (elemental standards for XRF, and crystalline samples such as Si, quartz, or Al₂O₃ for diffraction). Samples are aligned to the focal point of the x-ray microbeam, and raster scans are performed, where each pixel of a map corresponds to one measurement, e.g., one XRF spectrum or one diffraction pattern. The data are then processed using the in-house developed software XMAS, which outputs text files, where each row corresponds to a pixel position. Representative data from moissanite and an olive snail shell are presented to demonstrate data quality, collection, and analysis strategies.

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