Akademik Veri Yönetim Sistemi
2. INTERNATIONAL SARAJEVO SCIENTIFIC RESEARCH AND INNOVATION CONGRESS BOSNIA-HERZEGOVINA, Sarajevo, Bosna-Hersek, 30 - 31 Mayıs 2025, ss.321-329, (Tam Metin Bildiri)
Protection from ionizing radiation has a vital use, especially in nuclear energy production, medical imaging systems, details and space technologies, and industrial radiation applications. In recent years, high entropy alloy (HEA) based composite materials, which stand out with their multi-product structures, superior mechanical properties, and high thermal stability, have come to the fore as alternative solutions. In this study, the shielding performance of new composite materials obtained by doping Cr-Fe-V-W-Mo high entropy alloy with Ce₂O₃, Nb₂O₅, Sm₂O₃ and WO₃ oxide compounds against gamma radiation was investigated theoretically. Using the EpiXS program, the basic radiation interaction parameters, namely mass attenuation coefficient (μ⁄ρ), effective atomic number (Zeff) and electron density (Nel), were calculated in the energy range of 0.015–15 MeV. These parameters were analyzed in order to evaluate the attenuation behavior of radiation within the material. The findings revealed that Ce₂O₃, Nb₂O₅, Sm₂O₃ and WO₃ oxide additives to the high entropy alloy have significant effects on μ⁄ρ, Zeff and Nel depending on the photon energy. In the low energy photons (0.001–0.01 MeV) region, Ce₂O₃ additive provides the highest μ/ρ value and shows the most effective gamma ray absorption; Sm₂O₃ additive shows superior performance in the low-medium energy range, showing that it is an effective additive in this region. WO₃ has higher attenuation coefficients compared to other additives in the medium and high energy ranges. On the other hand, Nb₂O₅ additive has the lowest attenuation coefficients at all energy levels and is evaluated as the weakest additive in terms of shielding. At high energy levels (≥10 MeV),the, μ⁄ρ , Zeff and Nel values of all contributions approach each other, indicating that the material density is decisive in the interaction mechanism. In general, WO₃ and Sm₂O₃ contributions attracted attention with their high radiation shielding potential in wide energy ranges, which supports the usability of these composites in areas such as nuclear, medical and space industry. As a result, these composites were found to be environmentally friendly and high-performance candidates that can be used in next-generation radiation shield designs, and these theoretical findings provided a scientific basis for future experimental studies. Keywords: High entropy composite materials, Oxide doping, Mass attenuation coefficients, Nuclear radiation shielding, Nuclear shielding materials, Effective atomic number.