Browsing by Author "Çam-Kaynar S."

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    Determination of thorium adsorption processes by alpha spectrometry on Co-doped ZnO nano materials; modeling and optimization
    (Springer Science and Business Media B.V., 2023) Çam-Kaynar S.; Kaynar Ü.H.
    With increasing environmental problems, it has increased the focus on waste removal and recovery. The objective of this study was to employ Co-doped ZnO nano-material, synthesized using the gel-ignition method, for thorium (IV) adsorption. The adsorbent structure was characterized subsequently, thorium (IV) adsorption was optimized using the Response Rurface Method (RSM). The optimal combination of parameters was determined using the RSM model, where the R2 and R2Adj values were 0.9908 and 0.9639, respectively, indicating the theoretical and experimental conditions were in harmony. The experimental adsorption capacity of the Co-doped ZnO nanomaterial was found to be 121.29 mg g−1 under the specified optimum conditions. © 2023, Akadémiai Kiadó, Budapest, Hungary.
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    Determination of radioactivity levels and radiological risk factors in bozcaada-canakkale, turkey
    (Novin Medical Radiation Institute, 2024) Çam-Kaynar S.
    Background: Natural radiation is radiation that comes from two main environmental sources, the cosmic radiation from space that passes through the atmosphere, and terrestrial radiation is created when radionuclides decay in rock and soil. The most important radionuclides forming the natural radioactivity in terrestrial sources are 40K, 238U and 232Th. Material and Methods: In this study, 137Cs, 40K, 238U and 232Th activity levels were measured in samples taken from different parts of the island and beaches to determine the environmental radioactivity of Bozcada-Çanakkale using gamma spectrometry with a NaI(Tl) detector and radiation hazard indexes were calculated for soils. Results: Average activity concentrations of 40K, 238U, 232Th and 137Cs in soils were obtained as 427, 24, 31, and 29 Bqkg-1, respectively. The average activity values for 40K, 238U, 232Th and 137Cs in beach sands were determined to be 329, 23, 11 and 14 Bqkg-1, respectively. Radiological risk factors for Bozcaada soils were calculated. Conclusion: Our results were compared with the literature data and average world limit values. As a result of this study, we can state that the activity concentrations of Bozcaada Island beach sands are lower than the activity concentrations of soils. Since Bozcada is an island that attracts tourists, the low radionuclide activity in the beach sands shows that this place does not pose a significant radiological threat to peoples. © 2024 Novin Medical Radiation Institute. All rights reserved.