Spatial distribution of graphite in cement materials used for radioactive waste conditioning: An approach to analysis of neutron tomography data

Neutron Tomography Studies of Two Lamprophyre Dike Samples: 3D Data Analysis for the Characterization of Rock Fabric

“…To quantify the alignment of inclusions, one needs to mathematically define the shape orientation itself. We have used the Legendre ellipsoid approximation [ 11 , 12 ], where each particle is approximated by the ellipsoid, which has exactly the same inertia as the particle has. Thereby, we defined the shape orientation as orientation of three principal axes of Legendre ellipsoid or equivalent of the inertia moment tensor.…”

“…From this point of view, X-ray and neutron tomography methods can, potentially, provide a full 3D picture of the spheroidal texture, expressed by spatial distribution, particle morphology and shape orientation distribution of different kinds of inclusions inside the dike volume. It has been shown [ 10 , 11 , 12 , 13 ] that neutron radiography and tomography are efficient methods in studying the internal structure of different igneous and metamorphic rocks, as well as construction and archeological materials. In the case of rock material, the high penetration ability of neutrons, as compared to X-ray, allows one to measure rather large volumes, while high contrast between hydrous and anhydrous minerals in neutron images [ 10 , 14 ] provides the necessary conditions for phase segmentation.…”

The structural analysis of Kunya‐Urgench chondrite: The nondestructive neutron studies

“…Following Zel, Kenessarin, et al. (2021), we can calculate the components of the inertia moment tensor for each particle and utilize the corresponding eigenvectors as three orthonormal axes of the particle, which define the particle orientation. In Fig.…”

“…Several morphological parameters can be obtained from the neutron tomography 3-D data (Jennings & Parslow, 1988;Zel, Kenessarin, et al, 2021). So, to evaluate the shape of the particles, the distribution of sphericity parameter (Rao et al, 2001), which varies from 1.0 for ideal spherical particles to 0.0 for irregular shapes of particles, was calculated (Fig.…”

Effects of Graphite on Electrically Conductive Cementitious Composite Properties: A Review

“…To this effect, graphite does not directly participate in the hydration process. Zel et al [72] used the neutron diffraction method to analyze the primary phase of graphite-cement composite materials. The results diffraction peaks corresponding to graphite, AFt, and CH phases, respectively, with no extra new crystal phase produced.…”