http://hdl.handle.net/20.500.12566/559 2026-04-05T22:45:15Z http://hdl.handle.net/20.500.12566/2333 Investigation gamma attenuation properties of hydroxypropyl methyl cellulose polymer by using monte carlo simulation Ünlü, Ahmet; Özdoğan, Hasan Asscientific and technological advancements continue to progress, the applications of radiation are expanding day by day. The increased use of radiation has led to a corresponding rise in the number of people exposed to it. Living in close proximity to radiation poses biological risks to living organisms. This is especially true for individuals working in radiation-related fields who are required to be exposed to radiation as part of their duties. One of the three fundamental principles of radiation protection is shielding. Although lead has historically been the most widely used shielding material, its toxic properties have spurred ongoing research into new shielding materials. For this purpose, various materials such as glass, polymers, and composites are being developed and their radiation permeability is beingexamined. Advancements in the development of new shielding materials play a vital role in enhancing our ability to protect against the potentially harmful effects of radiation exposure. In this study, the photon interaction parameters of Hydroxypropyl Methyl Cellulose polymer, including Attenuation Coefficients, Half Value Layer, Tenth Value Layer, and Radiation Protection Efficiency, were calculated in the energy range of 0.1-10 MeV using PHITS 3.22 and MCNP6 Monte Carlo simulations. These results were then compared with theoretical calculations from WINXCOM. 2024-01-01T00:00:00Z http://hdl.handle.net/20.500.12566/2329 Calculation of the cross section of element 64 Zn with TALYS code and calculation of the agreement of these results with experimental measurements Ünlü, Ahmet; Özdoğan, Hasan In a nuclear reaction, each event resulting from the collision has its own probability and corresponding cross-section value. The cross section is a critical parameter in the study and scope of nuclear reactions. Especially in nuclear technology, medical applications and basic scientific research, accurate calculation and interpretation of such information is of great importance. The cross section helps determine how an element or isotope interacts with different frequencies to produce a change in the result. Detailed examination of cross-section data may provide guidance for the development of nuclear databases and new applications. In this study, the cross sections of the zinc element for proton-introduced reactions were calculated. In the study, TALYS 1.95 code was used to calculate the cross sections for protoninput reactions. TALYS is a widely used software for theoretical calculations of nuclear reactions and provides results over a wide energy range by modeling various nuclear processes. TALYS code can perform calculations according to many parameters and nuclear reaction mechanisms. In this study, Constant Temperature Fermi Gas, Backshift Fermi Gas and Generalized Superfluid level density models of TALYS code are used. The calculated cross-section results were interpreted by comparing them with the experimental data in the literature. 2024-01-01T00:00:00Z http://hdl.handle.net/20.500.12566/2216 Monte Carlo simulation analysis of radiation attenuation properties induced by arsenic accumulation in femur and tibia bones of rats exposed to sodium arsenite diet Gökçe, Yasin; Akman, Ferdi; Kılıçoğlu, Özge; Üncü, Yiğit Ali; Özdoğan, Hasan Purpose The study aims to investigate the effect of sodium arsenite (NaAsO2) on radiation permeability in biological tissues of rats, challenging existing literature claims about NaAsO2's influence on the density of bones. The motivation is determining whether exposure alters radiation permeability within a defined range of radiological energy. Should any changes be observed, radiation protection guidelines may necessitate the use of lower energy levels in imaging procedures involving such exposure. This consideration is vital for ensuring adherence to radiation safety standards, particularly in medical imaging, where minimizing patient and operator exposure to radiation is paramount. Materials and methods In this study, rats were divided into two groups: a control group and a NaAsO2-treated group. After the treatment period, these animals were euthanized to collect their femurs and tibias for further analysis. The elemental composition of these bones was then meticulously examined using Scanning Electron Microscopy (SEM), enhanced by Energy-dispersive X-ray Spectrometry (EDX). Monte Carlo Simulation codes of MCNP6 and PHITS 3.22 were used for investigate photon induced interactions. These powerful tools allowed us to assess the gamma-ray attenuation properties of the collected samples. For an accurate comparison and analysis, we referred to the NIST database using the WinXCom program. Furthermore, the study explored the effects of charged particles on the bone samples, employing the SRIM code for this purpose. This part of the research was crucial to understanding the interactions at a more detailed level. We calculated the photon attenuation parameters for radiological energies up to 0.5 MeV and also investigated the interactions of charged particles with energies as high as 15 MeV. Results In groups treated with NaAsO2, while there is less reduction in mass attenuation coefficients, larger differences have been observed in linear attenuation coefficients. Notably, a decrease in the linear attenuation coefficient has been observed in the NaAs Tibia group. Conclusion The application of sodium arsenite (NaAsO2) results in a reduction in the Linear Attenuation Coefficient, necessitating a detailed investigation to determine whether this decrease also affects the Hounsfield unit, in accordance with the ALARA (As Low As Reasonably Achievable) principle that guides radiation safety protocols. 2024-01-01T00:00:00Z http://hdl.handle.net/20.500.12566/2215 A pilot study of diabetes effects on radiation attenuation characteristics of tibia and femur of rats Gökçe, Yasin; Akman, Ferdi; Kılıçoğlu, Özge; Üncü, Yiğit Ali; Özdoğan, Hasan 2024-01-01T00:00:00Z