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- Yüksek Lisans TeziAçık Erişim2022Nadir toprak elementleriyle katkılandırılmış borat camların fiziksel ve radyasyon zırhlama özelliklerinin incelenmesi
İlyas İzgüden
Bu çalışmada Ülkemizde yer alan zengin bor madeni rezervinin daha verimli kullanılması amacıyla ana maddesi bor oksit olan ve içerisine yine ülkemizde ham madde olarak bulunan ve yeni keşifler ve incelemelere konu nadir toprak elementleri katkılanarak hazırlanan ve kurşun katkılı camlara alternatif olabilecek ve yüksek teknoloji ürünlerinde (Akıllı cihaz ekranları, uzay ve sağlık teknolojileri gibi) kullanılabilecek yeni nesil radyasyon kalkanlayıcı camlar üretmektir. Üretimi yapılan ürünlerin öncelikle XRD yöntemi ile faz tanımlaması yapılmış ve numunelerin amorf yapısına sahip cam olduğu belirlenmiştir. Üretilen numunelerin FTIR yöntemi ile kimyasal bağları ve moleküler yapıları araştırılarak düzgün bağlar oluşturan camlar olduğu belirlenmiştir. Elde edilen numunelerin UV-Vis Spektroskopisi yöntemi ile ışık geçirgenliği ve soğurma spektrumları belirlenerek normal cam karakteri gösterdiği belirlenmiştir. Camların camsı özelliklerinin iyi sonuçlar verdiği tespit edilmiş ve mekanik özelliklerden yoğunluk, sertlik, kırılma toklukları ve gevreklikleri incelenmiş ve sonuçları değerlendirilmiştir. Cam örneklerinin radyasyon zırhlama ölçümleri Atatürk Üniversitesi Fen Fakültesi Fizik Bölümü Prof. Dr. Wolf Weyrich Yüksek Enerji Spektroskopisi Laboratuvarı'nda bulunan deney düzeneği kullanılarak yapılmış ve cam örneklerinin kurşun katkılı camlara alternatif olabilecek seviyede radyasyon kalkanlama yaptığı belirlenmiştir. Bu çalışmanın amacı yapılan nadir toprak elementleri katkılı borat camlarda radyasyon zırhlamanın yanı sıra mekanik ve fiziksel özelliklerinin iyileştirilmesinde yardımcı olacak bir yayın (Tez) oluşturarak bilimsel çözümler sunmaktır.
- MakaleYalnız künye2020Scopus SJRQ1Evaluation of the radiation shielding capabilities of the Na2B4O7–SiO2–MoO3-Dy2O3 glass quaternary using Geant4 simulation code and Phy-X/PSD database
Aşkın, A.
The important gamma and neutron radiation shielding parameters of the Dy3+ doped (65-x)Na2B4O7–15SiO2–20MoO3-xDy2O3 (x = 0, 5, 10, 15, 20 mol%) glass quaternary system were investigated to provide decisive information for their application in radiation environment. Gamma and neutron attenuation properties of the glass systems studied here were evaluated in terms of the mass attenuation coefficient (μm), transmission fraction (TF), half value layer (HVL), mean free path (MFP), effective atomic number (Zeff), exposure buildup factors (EBF) and fast neutron removal cross-section (∑R) parameters. Investigation of the each aforementioned parameter was performed thanks to the utilization of Monte Carlo simulations along with the Phy-X/PSD database. The photon attenuation characteristics were evaluated for gamma ray energies varying between 0.284 and 5.0 MeV. This study indicated that increase of the Dy2O3 content from 0% to 20% mole, enhances the gamma shielding capability due to the increase of the parameters μm and Zeff. In this study it was also observed that ∑R increases from 0.099 to 0.107 cm−1 as the molar fraction of Dy2O3 increases.
AtıfScopus75WoS74OpenAlex82
İncele - MakaleYalnız künye2019Scopus SJRQ2Influence of RE oxides (Eu3+, Sm3+, Nd3+) on gamma radiation shielding properties of lead fluoroborate glasses
Wagh, Akshatha; Sayyed, M.I.; Askin, A.; Özpolat, Özgür Fırat; Sakar, E.; Lakshminarayana, G.; Kamath, Sudha D.
Authors report the change in lead fluoroborate glass properties with change in RE2O3 (RE = Eu, Sm, Nd) chemical composition. The RE2O3 exhibited improvement in the radiation shielding properties of the glass samples. The gamma rays shielding capabilities of the samples were studied using the WinXcom software (for Eu2O3, Sm2O3 doped glasses) and Monte Carlo simulation (for Nd2O3 doped glasses). The results exhibited that the mass attenuation coefficient (μm), effective atomic number (Zeff), and half value layer (HVL) depends on the concentration of RE2O3 and addition of the same significantly increased the shielding capabilities of the glass samples against gamma rays. The increase in photon energy revealed the decrease in radiation shielding properties. The reported density and radiation attenuation properties of RE2O3 doped lead fluoroborate glasses are predominant in radiation shielding applications which will be useful in high strength structures. Of all the glass samples 2.5 mol% of Eu2O3, Sm2O3 and Nd2O3 doped glasses showed enhanced shielding properties.
AtıfScopus40OpenAlex41İncele - MakaleYalnız künye2019Scopus SJRQ1Extensive study of newly developed highly dense transparent PbO-WO3-BaO-Na2O-B2O3 glasses for radiation shielding applications
Sayyed, M.I.; Aşkın, A.; Ali, Atif Mossad; Kumar, Ashok; Rashad, M.; Alshehri, Ali M.; Singh, Mandeep
Amorphous PbO – WO3 – BaO – Na2O – B2O3 glass system have fabricated using traditional melt quenching method. The XRD and FTIR spectra confirm the amorphous nature and the various structural properties of the glasses respectively. The various optical properties have been measured in the spectral range 400–4000 cm−1. Also, to understand the shielding ability of the fabricated glasses, we used the Geant4 model of a HPGe detector and WinXcom program to calculate the mass attenuation coefficient (MAC) at six energies between 356 and 2510 keV. In order to confirm the agreement between both methods, we used correlation theory and calculated the correlation coefficients (R2) for each sample. It is found that the R2 values are close to 1 for all samples. The MAC values at 356 keV for the prepared samples lies between 0.221 and 0.246 cm2/g. It is found that the usage of different concentration of PbO (from 50 to 70 mol%) affects the MAC values and thus the attenuation ability of the samples due to the heavier density of the PbO in comparison to B2O3. The effective atomic number results showed that Pb70B10 sample (contains 70 mol% of PbO) was higher than the other samples. Hence, Pb70B10 absorbs more photons than the rest of the prepared glasses.
AtıfScopus33OpenAlex33İncele - MakaleAçık Erişim2018Scopus SJRQ4The effect of hygrothermal aging on the glass and carbon reinforced epoxy composites for different stacking sequences
Dogan, Akar; Arman, Yusuf
The present paper examines the effects of hygrothermal aging on the reinforced epoxy composites. The roles of reinforcement types and stacking sequence on the mechanical properties of composites under hygrothermal aging are investigated. Four different composite materials with different stacking sequence were produced. Unidirectional E-glass and carbon fabrics with an areal density 300 gr/m2 as reinforcement and epoxy as matrix were used. Composites were manufactured using vacuum-assisted resin infusion molding. In order to determine the mechanical properties of the composites, specimens were prepared according to the ASTM standards. The aging process was carried out in climatic test cabin at a temperature of 90oC and a humidity of 90%. As a result of the tests, while the tensile strength of the glass reinforced composites decreased with aging time, no significant change was observed for carbon and hybrid composites. On the other hand, the tensile strength decreased in the transverse direction for all types of composites. XPS analysis was used to understand the distribution of atoms on the surface of specimens.
AtıfScopus22WoS19OpenAlex23İncele