Browsing by Author "Sayyed, M. I."

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Li2b4o7-Bi2o3 Glass System for Neutron Protection in Neutron Applications
(Pergamon-elsevier Science Ltd, 2023) Aygun, B.; Yorgun, N. Yildiz; Sayyed, M. I.; Karabulut, A.
In this study, new glass samples with a chemical composition of 40Li2B4O7+xBi2O3+(55-x)ZrO4+5CaWO4 (x = 10, 20, 30, 40, and 50 wt%) were fabricated using the melt quenching-annealing technique. Important neutron shielding parameters, such as the effective neutron removal cross-section, half-value layer, and neutron transmission factor, of all the new glass samples were calculated using the GEANT4 Monte Carlo simulation code. In addition, neutron dose measurements were performed using an 241Am-Be fast neutron source with an activity of 74 GBq and an average neutron energy of 4.5 MeV and a BF3 gaseous neutron detector. The results were compared with those of conventional shielding materials to determine the neutron absorption capabilities of the new glass materials. All the new glass samples were found to have excellent neutron shielding abilities. In particular, the GB5 sample had a high absorption capacity compared to the other samples. These new glass samples may be used as shielding materials in various radiation applications, such as generation of nuclear energy, radiation medicine, and the transport and storage of radioactive wastes.
Structural and Nuclear Radiation Shielding Properties of Bauxite Ore Doped Lithium Borate Glasses: Experimental and Monte Carlo Study
(Pergamon-elsevier Science Ltd, 2019) Kavaz, E.; Tekin, H. O.; Yorgun, N. Yildiz; Ozdemir, O. F.; Sayyed, M. I.
In this work, (Li2B4O7)((100-x)) (Bauxite)(x) (x = 0,10, 20, 30 and 40%) glasses were fabricated by standard melt quenching method. XRD spectra of the glasses were acquired and amorphous structures were verified. The variation of density and molar volume of the bauxite ore doped glasses were examined. The mass attenuation coefficients were measured for 81, 276, 302, 356 and 383 keV of incident photon energies by utilizing transmission method, MCNPX code and WinXCOM program. The obtained results are in good agreement with each other. Other gamma-ray shielding parameters such as half value layer (HVL), and effective atomic number (Z(eff)) for the bauxite doped glasses were also calculated. Additionally, neutron transmission factors and neutron removal cross-sections of the produced glasses were also investigated to interpret the neutron absorption capabilities. It was observed that the obtained parameters changed according to the increasing bauxite percentage of the lithium borate glasses. 40% bauxite doped glass showed the superior gamma and neutron shielding features. The presence of Fe, Ti and Al elements in the Bauxite mine has improved the shielding properties of lithium borate glasses.