[S-CG58] New Developments in fluid-rock Interactions: From Surface to Deep Subduction Zone

[SCG58-03] Neutron Imaging for Rock Samples Using by RANS

*Ayumi Ishiguro¹, Makoto Arimoto³, Tomohiro Kobayashi⁶, Maki Mizuta⁶, Atsushi Taketani⁶, Takaoki Takanashi⁶, Yasuo Wakabayashi⁶, Yoshie Otake⁶, Jun Kataoka⁴, Shinsuke Terazawa⁵, Satoshi Shiota⁵, Tomoaki Morishita² (1.Graduated School of Natural Science and Technology, Kanazawa University, 2.Geosciences and Civil Engineering,Kanazawa University, 3.Mathematics and Physics, Kanazawa University, 4.Faculty of Science and Engineering, Waseda University, 5.Advanced Components and Materials Division, Proterial Ltd., 6.RIKEN Center for Advanced Photonics Neutron Beam Technology Team)

To understand the global water cycle, it is important to understand the reactions between water and rocks. Many experiments have been conducted to study the permeability of water in rocks (e.g., Katayama et al., 2012 Nature Geosci.; Hatakeyama et al., 2017 Sci. Rep.). To link knowledge of water infiltration into rocks at its macro and micro scales, it is essential to develop nondestructive methods to visualize water infiltration into rocks and to measure the amount of water in rocks. We focus on neutron imaging techniques to visualize water in rocks. Neutrons easily penetrate solid materials and are scattered by the presence of water. Therefore, neutron imaging has been applied to visualize water infiltration into concrete (Zhang et al., 2018 Cement & Concrete Res.) and the distribution of hydrous minerals in rock samples (Howarth et al., 2014 Int. Geol. Rev.). It is expected to develop three dimensional imaging of water penetration into rocks by neutron technique. We are attempting to visualize water and/or hydrous minerals in rock samples and quantitative analysis of the water content of those rock samples. Here we show the results of the first imaging of three different rock samples with different water contents using the compact Neutron source RANS (RIKEN Accelerator-driven compact Neutron Source) . The same image data was also used to prepare a water content distribution map for a rock sample with high water content (serpentinite). Comparison of neutron imaging and X-ray imaging for the same rock sample will be presented.