Электронный каталог

Статья

Tishkevich, D.I.
W-Based Radiation Shields: Structure, Theoretical And Experimental Study Of Gamma Radiation Shielding Efficiency / D.I.Tishkevich, A.A.Rotkovich, T.N.Vershinina, [a.o.]. – Text : electronic // Ceramics International. – 2025. – Vol. 51, No. 24, Pt. B. – P. 42877-42885. – URL: https://doi.org/10.1016/j.ceramint.2025.07.031. – Bibliogr.: 38.

Tungsten-based radiation shields were synthesized using hot isostatic pressing sintering at 5 GPa and temperatures ranging from 1000 to 2000 °C. Scanning electron microscopy revealed that higher sintering temperatures significantly improved microstructural integrity, reducing porosity and enhancing grain bonding. Energy-dispersive analysis showed a rise in oxygen content from 0.6 to 1.2 wt% with temperature increasing from 1000 to 2000 °C, suggesting a raised oxidation process. X-ray diffraction confirmed a cubic-centered W phase in all specimens, while the intensity of WO&sub(2) peaks increased with a growth of temperature to 2000 &sup(o)C, indicating oxide phase formation. The relative density increased from 88.57 % to 99.11 %, while effective density rose from 17.05 to 19.08 g/cm&sup(3). The gamma-ray attenuation efficiency was evaluated theoretically in the XCOM software and experimentally using the narrow beam method with Na-22 (0.511–1.275 MeV), Ba-133 (0.302–0.356 MeV), Cs-137 (0.662 MeV), and Eu-152 (0.344–1.408 MeV) sources. The radiation shielding performance of the synthesized tungsten-based samples was evaluated in the *g-ray energy range of 0.3–1.408 MeV. With increasing photon energy, the linear attenuation coefficients and radiation protection efficiencies decreased, while the half-value layers and tenth-equivalent layers increased, consistent with theoretical trends. However, all samples maintained high shielding effectiveness, particularly at lower energies, with over 90 % efficiency at 0.662 MeV. Increasing the fabrication temperature enhanced the density of the samples, leading to improved attenuation properties across the energy range. The experimental results closely matched theoretical predictions (XCOM), confirming the reliability of the data. Overall, the prepared tungsten-based materials demonstrated strong and tunable *g-ray shielding capabilities, making them promising candidates for applications requiring compact and efficient radiation shielding.



Спец.(статьи,препринты) = С 36 - Физика твердого тела$
Спец.(статьи,препринты) = С 349 в - Защита от излучений. Защитные приспособления и материалы. Дозиметрическая характеристика излучателей
Спец.(статьи,препринты) = С 342 - Прохождение частиц и гамма-квантов через вещество
Спец.(статьи,препринты) = С 332.8 - Синхротронное излучение. Лазеры на свободных электронах. Получение и использование рентгеновских лучей
ОИЯИ = ОИЯИ (JINR)2025
Бюллетени = 45/025