YYÜ GCRIS Basic veritabanının içerik oluşturulması ve kurulumu Research Ecosystems (https://www.researchecosystems.com) tarafından devam etmektedir. Bu süreçte gördüğünüz verilerde eksikler olabilir.

Browsing by Author "Ozdemir, Y."

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    Article
    Micro-Chemical and Radiological Characterization Using Γ-Spectrometry and Wdxrf Spectrometry and Annual Effective Dose of Cigarette Tobaccos
    (Elsevier, 2014) Sogot, O.; Kocaer, A. F.; Zorer, O. Selcuk; Ozdemir, Y.; Dogru, M.
    Several kinds of cigarette tobacco were analyzed to determine contents of essential elements, natural and artificial radioactivity. The contents of essential elements and radionuclides were determined by WDXRF and gamma spectrometry, respectively. Samples were analyzed by WDXRF technique for the following elements; Al, P, S. Cl, K, Ca, Ti, Mn, Fe, Ni, Cu, Zn, As, Br, Stand In in cigarette tobaccos. In the contents of essential elements, the mean amounts of I< (48.891%) and Ca (38.358%) have the highest contents in the cigarette tobaccos. The radionuclide activity concentrations of (CS)-C-137, (238)u, Th-232, K-40 and Sr-90 were measured in cigarette tobaccos. According to radioactivity concentration results, U-238 ranged between 0.549 and 6.181 Bq/kg; Th-232 between 0.160 and 3.748 Bq/kg; Cs-137 between 0.023 and 2.355 Bq/kg; Sr-90 between 0.019 and 2.305 Bq/kg and K-40 between 2.894 and 56.333 Bq/kg. It was concluded that the annual effective dose due to inhalation for adults (smokers) for U-238 varied from 4.97 to 55.94 mu Sv/y (average 28.04 mu Sv/y), while for Th-232 from 12.48 to 292.41 mu Sv/y (average 138.65 mu Sv/y) and for K-40 from 18.97 to 370.45 nSv/y (average 139.83 nSv/y). The annual effective dose from Cs-137 and Sr-90 of Chemobyl origin varied from 0.70 to 71.29 nSv/y (average 29.86 nSv/y) and from 9.49 to 1150.93 nSv/y (average 415.29 nSv/y), respectively. (c) 2014 Elsevier B.V. All rights reserved.
  • Thumbnail Image
    Article
    Sources and Evolution of Miocene-Pleistocene Alkaline Magmatism in the Northeast Part of the Arabian Plate: Evidence From Sr-Nd Isotope Data and K-Ar Geochronometry
    (Maik Nauka/interperiodica/springer, 2024) Chugaev, A. V.; Parfenov, A. V.; Lebedev, V. A.; Chernyshev, I. V.; Oyan, V.; Ozdemir, Y.; Pavlidis, S. B.
    A geochronological and isotope-geochemical study of alkaline basalts from three areas of young magmatism within the northeastern part of the Arabian Plate (Southeastern Turkey), Batman, Kurtalan and Alemdag, was carried out. The obtained isotope data have indicated that the volcanism in the studied region developed over a 5-Ma period from the end of Miocene to the middle Pleistocene during four pulses separated by breaks in magmatic activity: 6.1-4.9 Ma (Batman area, hawaiites), similar to 3.0 Ma (Alemdag plateau, phase I, basalts), 2.0-1.9 Ma (Alemdag plateau, phase II, tephrites), and 1.5-1.3 Ma (Alemdag plateau, phase III, basalts; Kurtalan area, basalts). A comparison of spatial-temporal changes of magmatic activity evolution in the studied part of the Arabian Plate and within the largest basalt plateau of Arabian foreland, Karacadag Plateau, located to the west, was carried out. The results of Sr-Nd-Pb isotope-geochemical studies show that the development of young basalt volcanism in the Arabian Plate was characterized at different time by the contribution of various mantle sources in magma generation under this region. Initial pulses of magmatic activity are associated with melting of Arabian subcontinental lithospheric mantle (SCLM). The processes of fractional crystallization combined with crustal assimilation (AFC) have played an important role in the petrogenesis of lavas as well. Later, a deep mantle source (PREMA) with a depleted isotopic composition played a leading role in the formation of basaltic magmas of increased alkalinity. The melts generated by this source were mixed with the SCLM material in various proportions at different stages of magmatism with a limited participation of AFC processes in the petrogenesis of the rocks. It was concluded that young basalt volcanism of increased alkalinity in the northeast of the Arabian Plate is not related to the collision of the Eurasian and Arabian plates genetically, but presumably manifested here as a result of the migration of the initial rift geodynamic setting from the Red Sea basin to the north along Levantine and East Anatolian transform faults due to directed convection flows in the lower part of mantle under this part of the Earth.