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- 검색키워드
- 저자 : Alhindawy Islam G. (검색결과 2 건)
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Alhindawy Islam G.,Gamal Hany,Almuqrin Aljawhara.H.,Sayyed M.I.,Mahmoud K.A. 한국원자력학회 2023 Nuclear Engineering and Technology Vol.55 No.5
The present work aims to fabricate Na1þxZr2SixP3-xO12 compound at various calcination temperatures based on the zircon mineral. The fabricated compound was calcinated at 250, 500, and 1000C. The effect of calcination temperature on the structure, crystal phase, and radiation shielding properties was studied for the fabricated compound. The X-ray diffraction diffractometer demonstrates that, the monoclinic crystal phase appeared at a calcination temperature of 250C and 500C is totally transformed to a highsymmetry hexagonal crystal phase under a calcination temperature of 1000C. The radiation shielding capacity was also qualified for the fabricated compounds using the Monte Carlo N-Particle transport code in the g-photons energy interval between 15keV and 122keV. The impacts of calcination temperature on the g-ray shielding behavior were clarified in the present study, where the linear attenuation coefficient was enhanced by 218% at energy of 122keV, when the calcination temperature increased from 250 to 1000C, respectively
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Alhindawy Islam G.,Marashdeh Mohammad. W.,Aljaafreh Mamduh. J.,Al-Hmoud Mohannad,Alanazi Sitah,Mahmoud K. 한국원자력학회 2024 Nuclear Engineering and Technology Vol.56 No.7
This work demonstrates a new sol-gel approach for synthesizing PbO2-doped zirconia using zircon mineral precursors. The streamlined methodology enables straightforward fabrication of the doped zirconia composites. Comprehensive materials characterization was performed using XRD, SEM, and TEM techniques to analyze the crystal structure, microstructure, and morphology. Quantitative analysis of the XRD data provided insights into the nanoscale crystallite sizes achieved, along with their relationship to lattice imperfections. Furthermore, the gamma-ray shielding capacity for the PbO2-doped zirconia samples was estimated by the Monte Carlo simulation, which proves an increase in the gamma ray shielding properties by raising the Pb concentration. The linear attenuation coefficient increased between 0.467 and 0.499 cm 1 (at 0.662 MeV) by increasing the Pb content between 11 and 21 wt%. By increasing the Pb content to 21 wt%, the synthesized composites’ lead equivalent thickness reaches 2.49 cm. The radiation shielding properties for the synthesized composites revealed a remarkable performance against low and intermediate γ-ray photons, with radiation shielding capacity of 37.3 % and 21.4 % at 0.662 MeV and 2.506 MeV, respectively. As a result, the developed composites can be employed as an alternative shielding material in hospitals and radioactive zones
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