| Partner: László Szentmiklósi |
Recent publications
| 1. | Harsányi I.♦, Horváth A.♦, Kis Z.♦, Gméling K.♦, Jóźwiak-Niedźwiedzka D., Glinicki M.A., Szentmiklósi L.♦, Assessment of neutron-induced activation of irradiated samples in a research reactor, Nuclear Engineering and Technology, ISSN: 1738-5733, DOI: 10.1016/j.net.2022.11.004, Vol.55, pp.1036-1044, 2023 Abstract: The combination of MCNP6 and the FISPACT codes was used to predict inventories of radioisotopes produced by neutron exposure of a sample in a research reactor. The detailed MCNP6 model of the Budapest Research Reactor and the specific irradiation geometry of the NAA channel was established, while realistic material cards were specified based on concentrations measured by PGAA and NAA, considering the precursor elements of all significant radioisotopes. The energy- and spatial distributions of the neutron field calculated by MCNP6 were transferred to FISPACT, and the resulting activities were validated against those measured using neutron-irradiated small and bulky targets. This approach is general enough to handle different target materials, shapes, and irradiation conditions. A general agreement within 10% has been achieved. Moreover, the method can also be made applicable to predict the activation properties of the near-vessel concrete of existing nuclear installations or assist in the optimal construction of new nuclear power plant units. Keywords:MCNP6,Monte Carlo simulations,FISPACT,Isotope inventory,Radioisotope production,Neutron activation analysis,Mineral aggregate,Radiation shielding concrete Affiliations:
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| 2. | Kim H.T.♦, Razakamandimby D.F.T.♦, Szilagyi V.♦, Kis Z.♦, Szentmiklosi L.♦, Glinicki M.A., Park K.♦, Reconstruction of concrete microstructure using complementarity of X-ray and neutron tomography, CEMENT AND CONCRETE RESEARCH, ISSN: 0008-8846, DOI: 10.1016/j.cemconres.2021.106540, Vol.148, pp.106540-1-12, 2021 Abstract: The concrete microstructure was successfully reconstructed using the complementarity of X-ray and neutron computed tomography (CT). Neither tomogram alone was found to be suitable to properly describe the microstructure of concrete under this study. However, by merging the information revealed by the two modalities, and using image segmentation, noise reduction, and image registration techniques we reconstruct the concrete microstructure. Void, aggregate, and cement paste phases are successfully captured down to the images' spatial resolution, even though the aggregate consists of multiple minerals. The coarse-aggregate volume fraction of the reconstructed microstructure was similar to that of the mixing proportions. Furthermore, image-based finite element analysis is performed to demonstrate the effects of microstructure on stress concentration and strain localization. Keywords:concrete microstructure, X-ray tomography, neutron tomography, image segmentation, complementarity field, image-based analysis Affiliations:
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