Browsing by Author "Sayyed, M., I"

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Borax Effect on Gamma and Neutron Shielding Features of Lithium Borate Glasses: an Experimental and Monte Carlo Studies
(Iop Publishing Ltd, 2019) Yorgun, N. Yildiz; Kavaz, E.; Tekin, H. O.; Sayyed, M., I; Ozdemir, O. F.
In this work, lithium borate glasses, with (Li2B4O7)(100-x)(Borax)x (x=0,10,20,30,40 wt%) compositions, were prepared with melt quenching technique for investigating their radiation shielding properties. The molar mass, molar volume and density of the glasses were obtained via experimental methods. XRD spectra were acquired to control amorphous structures of the prepared glasses. The mass attenuation coefficient (mu(rho)) for the glasses was measured experimentally at photon energy range between 81 to 383 keV using Ba-133 radioactive point source. The results were compared with the values obtained from MCNPX and WinXCOM programs. It is seen that, the experimental results were in good agreement with findings from MCNPX and WinXCOM programs. The outcomes showed that mass attenuation coefficient, mu(rho), and the effective atomic number, Z(eff), rise with increasing doping rate of borax from 0 to 40% mol. Additionally, it was observed that half value layer (HVL) values of the glasses decreases with increasing borax ratio. Finally, the neutron attenuation skills of the glasses were evaluated by examining the neutron transmission factor and effective removal cross section (Sigma R) parameters. The presence of elements such as H and B in the content of borax mineral significantly increased the Sigma R values of the glasses as expected.
Development and Production of Metal Oxide Doped Glasses for Gamma Ray and Fast Neutron Shielding
(Pergamon-elsevier Science Ltd, 2020) Aygun, Bunyamin; Sakar, Erdem; Cinan, Esra; Yorgun, Nergiz Yildiz; Sayyed, M., I; Agar, O.; Karabulut, Abdulhalik
In this study, new glasses were designed and produced that did not consist of toxic lead oxide (PbO). Unlike conventional glass with powdered silicon oxide (SiO2) added [cobalt oxide (CoO), cadmium tungsten oxide (CdWO4), bismuth oxide (Bi2O3), chromium oxide (Cr2O3), and boron oxide (B2O3)], new glass specimens were fabricated via melt-quenching. The total macroscopic cross-sections, mean free path, and transmission number were calculated using GEANT4 Monte Carlo code. The equivalent dose rates were measured for 4.5 MeV fast neutrons. Gamma attenuation experiments were conducted at several energies in a range of 53-383 keV. The experimental and theoretical results were compared with those of construction concrete, paraffin, glasses containing lead, borosilicate, normal window, and soda glasses. The new glass minimized both gamma and neutron radiation leaks that may occur in various fields such as radiation treatment, nuclear power plants, radioactive waste transport and storage, and space and laboratory research.