Yazar "Kaky, Kawa M." seçeneğine göre listele

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    A comparative study on gamma photon shielding features of various germanate glass systems
    (Elsevier Sci Ltd, 2019) Dong, M. G.; Ağar, Osman; Tekin, H. O.; Kılıçoğlu, O.; Kaky, Kawa M.; Sayyed, M. I.
    In this paper, we studied the gamma photon attenuation properties for different germanate glasses systems with composition Sb2O3-GeO2-SiO2-Al2O3, TeO2-WO3-GeO2, GeO2-TeO2/SiO2-PbO-CaO-Tm2O3 and B2O3-GeO2-Gd2O3-Eu2O3-GdF3-BaF2. The mass attenuation coefficients (mu/rho) for the selected germanate glasses were calculated at different energies (between 0.015 MeV and 15 MeV) using the MCNPX code. The calculated MCNPX mu/rho values then compared with the WinXCom data to check the accuracy in the results. The results showed that the Sb2O3 replacement by SiO2 causes a decrease in mu/rho for Sb2O3-GeO2-SiO2-Al2O3 glass system. Also, it is found that for TeO2-WO3-GeO2 glass system, mu/rho decreases as GeO2 content increases from 1 to 20 mol%. While for GeO2-TeO2/SiO2-PbO-CaO-Tm2O3 glass system, the results revealed that the glass samples contain TeO2 possess higher mu/rho values than the samples contain SiO2. For the B2O3-GeO2-Gd2O3-Eu2O3-GdF3-BaF2 glasses, we found that the mu/rho values decrease as BaF2 is increased from 0 to 15 mol%. Moreover, it is found that 5OSb-OGe for series 1, TWGO for series 2, 2G4T for series 3 and X = 0 for series 4 glass samples among the studied glasses have the highest effective atomic number values. On the basis of the results achieved, 50Sb-OGe, TWGO, 2G4T and X = 0 samples have the best radiation shielding characteristics among the selected glasses.
  • Küçük Resim
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    Gamma radiation shielding investigations for selected germanate glasses
    (Elsevier Science Bv, 2019) Sayyed, M. I.; Kaky, Kawa M.; Sakar, Erdem; Akbaba, Uğur; Taki, Malaa M.; Ağar, Osman
    Radiation shielding characteristics of different germanate glasses with compositions of Nd doped Bi2O3-SiO2/GeO2-Nd2O3, Sm3+ doped B2O3-GeO2-Gd2O3, Tb-3 doped GeO2-B2O3-SiO2-Ga2O3, TeO2-GeO2-Li2O and Na2O-GeO2-P2O5 glasses have been studied using XCOM program at several photon energies between 0.015 and 10 MeV. Dependencies of their photon attenuation properties with the photon energy and the composition have been investigated. The mass attenuation coefficient values and the effective atomic numbers for Nd doped Bi2O3-SiO2/GeO2-Nd(2)O(3)glasses are higher than those of the other samples. 69Bi(2)O(3)-30GeO(2)-1.0Nd(2)O(3) has the highest mass attenuation coefficients among the selected samples. The Z(eff) results revealed that to increase the photon attenuation ability for the germanate glasses, high Z-elements (such as Bi, Te and Tb) in a suitable concentration must be included. The HVL results for the present germanate glasses suggested that the attenuation capacity of the gamma photons increases as the density of the sample increases, hence, the glass sample with high density must be considered for high attenuation ability. Also, the significant influence of modifier contents on the HVL values namely the attenuation ability has been noticed for Tb-3 doped GeO2-B2O3-SiO2-Ga2O3 and TeO2-Li2O-GeO2 glasses. Moreover, the values of the mean free path for the selected samples have been compared with those of different radiation shielding glasses and concrete samples.
  • Küçük Resim
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    An investigation on shielding properties of BaO, MoO3 and P2O5 based glasses using MCNPX code
    (Elsevier Science Bv, 2019) Ağar, Osman; Sayyed, M. I.; Tekin, H. O.; Kaky, Kawa M.; Baki, S. O.; Kityk, I.
    In the present work, some radiation shielding quantifies (mass attenuation coefficients, effective atomic number, effective electron density, half value layer and mean free path) for various BaO-MoO3-P2O5 ternary glass systems have been determined within the 0.015-15 MeV energy range, using WinXCom program. Additionally, the mass attenuation coefficients of all the investigated glasses have been calculated using MCNPX simulation code (version 2.6.0) and compared to those of WinXCom results. Among the studied glasses, BaMoP8 glass sample with MoO3 content of 70% mol is found to have superior gamma-ray shielding characteristics. Moreover, the glasses studied in this paper possess better radiation shielding properties by providing shorter half value layer (HVL) than RS-253 G18 commercial glass and some concrete samples namely ordinary, hematite-serpentine and ilmanite-limonite.