First application of scintillator-based photon-counting computed tomography to rock samples: Preliminary results and prospects
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Ayumi Ishiguro
Abstract
Knowledge of the three-dimensional distribution of minerals in a rock sample is of fundamental importance to deciphering a sample’s properties and history. Attenuation-contrast X-ray computed tomography (X-ray CT) is widely used in the geosciences to determine the three-dimensional distributions of minerals or pores, or both. Photon counting CT (PC-CT) uses a novel energy-resolved X-ray detector that allows X-rays with a continuous energy spectrum to be detected separately within arbitrary energy ranges. Here we report the first results of applying laboratory-build PC-CT combined with multi-pixel photon counter (MPPC) to common minerals such as quartz and calcite. In the low-energy range, PC-CT produced higher contrast images than single-energy X-ray CT. Minerals were successfully identified from the relationships between the mean CT values for each energy window and the mean difference between pairs of energy windows. These results suggest that PC-CT can produce high-contrast images of minerals and may be able to distinguish mineral phases with different attenuation curves, even when their CT values are similar. We obtained CT images of minerals in a natural sedimentary rock sample, composed mainly of quartz and carbonate. Although the spatial resolution of the detector in this study was insufficient for the sample, the main carbonate veins were clearly visible as high carbonate-content areas in the PC-CT images. Given some prior knowledge of mineral phases from other methods, it may be possible to use PC-CT imaging to obtain further information about their chemical compositions.
Acknowledgments and funding
We thank Susumu Umino and Tomoyuki Mizukami for discussing this study. Valuable comments by Mark Rivers and an anonymous reviewer and suggestions from the editor greatly improved the revised manuscript. This study was financially supported by a Grants-in-Aid for Scientific Research from the Ministry of Education Culture, Sports, Science and Technology of Japan (no. JP20K20941 to T.M. and no. JP19H04483 to MA), JST ERATO Grant number JPMJER2102 to M.A. and J.K. and the Mitani Foundation for Research and Development 2020 to T.M. and M.A.
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Articles in the same Issue
- Germanium distribution in Mississippi Valley-Type systems from sulfide deposition to oxidative weathering: A perspective from Fule Pb-Zn(-Ge) deposit, South China
- Characterization and potential toxicity of asbestiform erionite from Gawler Downs, New Zealand
- First widespread occurrence of rare phosphate chladniite in a meteorite, winonaite Graves Nunataks (GRA) 12510: Implications for phosphide–phosphate redox buffered genesis in meteorites
- K isotopic fractionation in K-feldspar: Effects of mineral chemistry
- Jarosite formation in Permian-Triassic strata at Xiakou (South China): Implications for jarosite precipitation from H2S upwelling on Mars
- The effect of A-site cations on charge-carrier mobility in Fe-rich amphiboles
- Calorimetry and structural analysis of uranyl sulfates with rare topologies
- Biological control of ultra-skeleton mineralization in coral
- Systematic study of high field strength elements during liquid immiscibility between carbonatitic melt and silicate melt
- Clustering and interfacial segregation of radiogenic Pb in a mineral host-inclusion system: Tracing two-stage Pb and trace element mobility in monazite inclusions in rutile
- First application of scintillator-based photon-counting computed tomography to rock samples: Preliminary results and prospects
- GCDkit.Mineral: A customizable, platform-independent R-language environment for recalculation, plotting, and classification of electron probe microanalyses of common rock-forming minerals
- Apatite as an archive of pegmatite-forming processes: An example from the Berry-Havey pegmatite (Maine, U.S.A.)
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