http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/13942 2026-04-23T07:04:13Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14513 Investigation of the High Radiation Levels in Plio-Quaternary Volcanic and Pyroclastic Rocks Used as Building Raw Materials in Isparta Volcanic Area, SW Turkey ÇOBAN, Hakan Available natural radioactivity (40K, 238U, 232Th) measurements on Plio-Quaternary volcanic and pyroclastic rocks, which are usually used as building raw materials, from the Isparta region of SW Turkey, released that their radium equivalent activity values are close to the internationally accepted upper limits and a potential radiation risk. In this study, the relationship between their magma and source characteristics has been investigated to reveal the reason of the high radiation values in these volcanic materials carrying value by more than three times the equivalent materials in Turkey. Recent volcanological studies have shown that potassic-ultrapotassic magmas governed the genesis of the Isparta volcanism. Potassium-rich characters and elevated concentrations of radiogenic (e.g.,Th and U) and total rare earth elements (∑REE) are their most diagnostic features. These characteristics are also similar to some mantle-derived carbonatites (e.g., Norwage and Kenya) with high radiation levels. To support this, recent investigations also revealed that the origin of Isparta potassic volcanism is associated with a common and enriched mantle source, which were interacted with carbonatite melts. Accordingly, carbonatitic melts left their geochemical imprints into their mantle sources, and partial melting of this mantle source produced K, REE, Th, and U-rich volcanic materials with high radiation levels in the region. These results indicate that the carbonatite-influenced mantle source were played a key role for not only enrichments in distinct elements (e.g., Th, U and REE) but also high radioactivity levels in Isparta volcanic and pyroclastic rocks. In this study, attention is drawn to the fact that a potential risk of high radiation in volcanic and pyroclastic rocks used as building raw materials can be expected for a given volcanic region, which include potassic magma derived from a carbonatitemodified mantle source. 2019-01-01T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14512 Calculations of Spontaneous Fission (SF) half-lives of superheavy nuclei in different models SOYLU, Asım The spontaneous fission (SF) is a decay mode for heavy and superheavy nuclei (Z≥90) and it is an important confining factor explaning the stability of synthesized superheavy nuclei. Since the fission decay is complex, it is difficult to explain such a multi-dimensional system in a complete microscopic manner. In this study, SF half-lives of 284Cn and 284Fl superheavy nuclei are investigated using the direct method, the Universal Decay Law (UDL). The fission decay constant for each possible case is computed by using the UDL and then the SF half-life for 284Cn and 284Fl superheavy nuclei are predicted. The calculated SF half-lives are compared with the results of other semiempirical models and the experimental data. Furthermore, the results are compared with ones of the model in which they proposed this direct method for the SF by using CPPM potentials. Good agreement has been obtained between the results of present approach and the others. This study shows that UDL would also be used in the halflives calculations of Spontaneous Fission of superheavy nuclei in a direct way. 2019-01-01T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14511 Calculation of Radiogenic Heat Productions from Marble and Glazed Tiles Used as Covering Building Materials in Turkey HANÇERLİOĞULLARI, Aybaba; TURHAN, Şeref; KURNAZ, Aslı In this study, radiogenic heat productions of marble and glazed tiles samples are calculated based on the elemental concentrations of uranium (in terms of mg/kg), thorium (in terms of mg/kg) and potassium (in terms of %) in the samples collected from various provinces in Turkey. The radiogenic heat productions from the marble tile samples varied from 0.05 to 2.17 µW/m3 with an average of 0.26 µW/m3. The average of the radiogenic heat production of the marble tile samples is approximately four times lower than the average continental crust of 0.9 µW/m3. 2019-01-01T00:00:00Z http://dspace.beu.edu.tr:8080/xmlui/handle/123456789/14509 Energy loss analysis from RBS spectrum of thin Cu2ZnSnS4 (CZTS) film USTA, Metin The goal of this work is to offer an alternative method to the available literature on determining the energy loss of CZTS thin films. For this purpose, thin CZTS film structures were first produced by sol-gel method and then the RBS spectrum was received with RBS detector irradiating this structure with 3.034 MeV proton beams in a microbeam chamber. The energy calibration was implemented to this spectrum, where the it was fitted with SIMNRA program. In the RBS spectrum of the thin film generated, a method for the calculation of energy loss was used for the position and energy width analysis of the corresponding peaks and a polynomial fit was obtained from the stopping power of the CZTS thin film by making certain approaches. Also, the effective charge approach that we used in our previous studies for the stopping power was employed with atomic natural orbitals and it was founded that the results were close to each other at certain error rates. The data obtained from this study will inspire the future studies on the interaction of radiation with matter. 2019-01-01T00:00:00Z