Browsing by Author "Ozdemir, O. F."

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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.
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.