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J. Imaging 2018, 4(5), 72; https://doi.org/10.3390/jimaging4050072

Investigation of a Monturaqui Impactite by Means of Bi-Modal X-ray and Neutron Tomography

1
Science and Technology Facility Council, ISIS Neutron Source, Didcot OX11 0QX, UK
2
European Spallation Source ESS ERIC, SE-221 00 Lund, Sweden
3
DTU Compute, DK-2800 Kgs Lyngby, Denmark
4
ERASMUS MC, Biomedical Imaging Group, 3000 CA Rotterdam, The Netherlands
5
Department of Chemistry, University of Copenhagen, 2100 Copenhagen, Denmark
6
DTU Physics, 2800 Kgs Lyngby, Denmark
7
Laboratoire Léon Brillouin, CEA-CNRS, 91191 Gif-sur-Yvette CEDEX, France
8
Nano-Science Centre, Niels Bohr Institute, University of Copenhagen, 2100 Copenhagen, Denmark
9
Paul Scherrer Institut, 5232 Villigen, Sweden
*
Author to whom correspondence should be addressed.
Received: 21 March 2018 / Revised: 11 May 2018 / Accepted: 12 May 2018 / Published: 18 May 2018
(This article belongs to the Special Issue Neutron Imaging)
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Abstract

X-ray and neutron tomography are applied as a bi-modal approach for the 3D characterisation of a Monturaqui impactite formed by shock metamorphism during the impact of an iron meteorite with the target rocks in the Monturaqui crater (Chile). The particular impactite exhibits structural heterogeneities on many length scales: its composition is dominated by silicate-based glassy and crystalline materials with voids and Fe/Ni-metal and oxihydroxides particles generally smaller than 1 mm in diameter. The non-destructive investigation allowed us to apply a novel bi-modal imaging approach that provides a more detailed and quantitative understanding of the structural and chemical composition compared to standard single mode imaging methods, as X-ray and neutron interaction with matter results in different attenuation coefficients with a non-linear relation. The X-ray and neutron data sets have been registered, and used for material segmentation, porosity and metallic content characterization. The bimodal data enabled the segmentation of a large number of different materials, their morphology as well as distribution in the specimen including the quantification of volume fractions. The 3D data revealed an evaporite type of material in the impactite not noticed in previous studies. The present study is exemplary in demonstrating the potential for non-destructive characterisation of key features of complex multi-phase objects such as impactites. View Full-Text
Keywords: neutron imaging; X-ray imaging; multimodal imaging; bimodal imaging; computed tomography; impactite; Monturaqui neutron imaging; X-ray imaging; multimodal imaging; bimodal imaging; computed tomography; impactite; Monturaqui
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Fedrigo, A.; Marstal, K.; Bender Koch, C.; Andersen Dahl, V.; Bjorholm Dahl, A.; Lyksborg, M.; Gundlach, C.; Ott, F.; Strobl, M. Investigation of a Monturaqui Impactite by Means of Bi-Modal X-ray and Neutron Tomography. J. Imaging 2018, 4, 72.

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