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Öğe Alloying effect on K X-ray intensity ratio and production cross section values of Zn and Cr in Zn-Cr alloys(Pergamon-Elsevier Science Ltd, 2013) Dogan, M.; Tirasoglu, E.; Karahan, I. H.; Aylikci, N. Kup; Aylikci, V.; Kahoul, A.; Cetinkara, H. A.In this study, sigma(K alpha), sigma(K beta) production cross-sections and K-beta/K-alpha intensity ratios of Cr and Zn have been measured in pure metals and in different alloy compositions which have different composition values. And also, empirical and semi-empirical K-shell fluorescence yields (omega(K)) and K-beta/K-alpha intensity ratios from the available experimental data for elements with 23 <= Z <= 30 were calculated. The experimental data are fitted using the quantity (omega(K)/(1-omega(K)))(1/4) vs. Z to deduce the empirical K-shell fluorescence yields and K-beta/K-alpha intensity ratios. The effects of alloying on the fluorescence parameters and bath temperatures on alloy compositions were investigated. Our analysis indicates that these effects arise from reorganization of atom and charge transfer mechanism in alloys. (c) 2013 Elsevier Ltd. All rights reserved.Öğe Alloying effect on K X-ray intensity ratio and production cross section values of Zn and Cr in Zn-Cr alloys (vol 87, pg 6, 2013)(Pergamon-Elsevier Science Ltd, 2015) Dogan, M.; Tirasoglu, E.; Karahan, I. H.; Aylikci, N. Kup; Aylikci, V.; Kahoul, A.; Cetinkara, H. A.[Abstract Not Available]Öğe Average M Shell Fluorescence Yields for Elements with 70?Z?92(Amer Inst Physics, 2015) Kahoul, A.; Deghfel, B.; Aylikci, V.; Aylikci, N. K.; Nekkab, M.The theoretical, experimental and analytical methods for the calculation of average M-shell fluorescence yield ((omega) over barM) of different elements are very important because of the large number of their applications in various areas of physical chemistry and medical research. In this paper, the bulk of the average M-shell fluorescence yield measurements reported in the literature, covering the period 1955 to 2005 are interpolated by using an analytical function to deduce the empirical average M-shell fluorescence yield in the atomic range of 70 <= Z <= 92. The results were compared with the theoretical and fitted values reported by other authors. Reasonable agreement was typically obtained between our result and other works.Öğe Calculation of K-Shell Fluorescence Yields for Low-Z Elements(Amer Inst Physics, 2015) Nekkab, M.; Kahoul, A.; Deghfel, B.; Aylikci, N. Kup; Aylikci, V.The analytical methods based on X-ray fluorescence are advantageous for practical applications in a variety of fields including atomic physics, X-ray fluorescence surface chemical analysis and medical research and so the accurate fluorescence yields (omega(K)) are required for these applications. In this contribution we report a new parameters for calculation of K-shell fluorescence yields (omega(K)) of elements in the range of 11 <= Z <= 30. The experimental data are interpolated by using the famous analytical function (omega(K)/(1-omega(K)))(1/q) (were q=3, 3.5 and 4) vs Z to deduce the empirical K-shell fluorescence yields. A comparison is made between the results of the procedures followed here and those theoretical and other semi-empirical fluorescence yield values. Reasonable agreement was typically obtained between our result and other works.Öğe Effect of pH treatment on K-shell x-ray intensity ratios and K-shell x-ray-production cross sections in ZnCo alloys(Amer Physical Soc, 2011) Aylikci, N. Kup; Aylikci, V.; Kahoul, A.; Tirasoglu, E.; Karahan, I. H.; Cengiz, E.In this study, empirical and semiempirical K-shell fluorescence yields (omega(K)) and K beta/K alpha intensity ratios from the available experimental data for elements with 23 <= Z <= 30 were calculated to compare them with elements in different alloys. The experimental data are fitted using the quantity [omega(K)/(1 -omega(K))](1/4) vs Z to deduce the empirical K-shell fluorescence yields and K beta/K alpha intensity ratios. The empirical and semiempirical K-shell fluorescence yield values were used to calculate the K x-ray-production cross-section values for pure Co and Zn elements. Also, sigma(K alpha), sigma(K beta) production cross sections and K beta/K alpha intensity ratios of Co and Zn have been measured in pure metals and in different alloy compositions which have different pH values. The samples were excited by 59.5-keV. rays from a Am-241 annular radioactive source. K x rays emitted by samples were counted by an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV. The effect of pH values on alloy compositions and the effect of alloying on the fluorescence parameters of Co and Zn were investigated. The x-ray fluorescence parameters of Co and Zn in the alloying system indicate significant differences with respect to the pure metals. These differences are attributed to the reorganization of valence shell electrons and/or charge transfer phenomena.Öğe Empirical and semi-empirical interpolation of L X-ray fluorescence parameters for elements in the atomic range 50 ? Z ? 92(Pergamon-Elsevier Science Ltd, 2015) Aylikci, V.; Kahoul, A.; Aylikci, N. Kup; Tirasoglu, E.; Karahan, I. H.; Abassi, A.; Dogan, M.In this study, interpolations (empirical and semi-empirical) of L sub-shell fluorescence yield and L shell Coster-Kronig transition probability values and the measured L X-ray production cross-sections, intensity ratios and L sub-shell fluorescence yield values of elements have been performed in the range of 50 <= Z <= 92. In this experimental setup, two sources (50 mCi Fe-55 and 50 mCi Am-241) were used. L X-rays emitted by samples were counted by an Ultra-LEGe detector with a resolution of 150 eV at 5.9 key. (C) 2014 Elsevier Ltd. All rights reserved.Öğe Empirical, Semi-Empirical and Experimental Determination of K X-Ray Fluorescence Parameters of Some Elements in the Atomic Range 21 ? Z ? 30(Taylor & Francis Inc, 2015) Aylikci, V.; Kahoul, A.; Aylikci, N. Kup; Tirasoglu, E.; Karahan, I. H.In this study, the semi-empirical and empirical calculations of K X-ray intensity ratios, K-shell fluorescence yields, and vacancy transfer probabilities have been performed for 3d transition elements. Also, sigma(K alpha), sigma(K beta) production cross-sections, K-beta/K-alpha intensity ratios, omega(K) fluorescence yields, and eta(KL) vacancy transfer probabilities of 3d transition elements have been measured. The samples were excited by 59.5 keV gamma-rays from a Am-241 annular radioactive source. K X-rays emitted by samples were counted by an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV.Öğe The investigation of K-shell fluorescence parameters of Zn-Fe alloys with different grain size and microstrain values(Wiley, 2017) Aylikci, N. Kup; Sampaio, J. M.; Kahoul, A.; Aylikci, V.; Karahan, I. H.; Guerra, M.; Santos, J. P.It is known that zinc alloys with iron group metals have better corrosion resistance than pure zinc. Owing to the corrosion resistance of these alloys, Zn-Fe coatings are widely used in automotive industry and have excellent mechanical performance. In this work, we investigated the relationship between the changes in the measured X-ray fluorescence parameters (K/K, sigma(K) and sigma(K)) and the changes in the structural parameters such as microstrain or grain size values for Zn-Fe alloys that were prepared with different pH values. To explain these changes, the K and KX-ray production cross sections, and the K/KX-ray intensity ratio values were calculated by three different ways for the elemental forms of Zn and Fe. The structural parameters, such as microstrain and grain size, were also calculated. We expect that the outer shell electronic distribution affects the structural parameters of the produced Zn-Fe alloys, changing the measured K and KX-ray production cross sections, and the K/KX-ray intensity ratio values. We also show that Zn-Fe alloy mi nimum microstrain value corresponds to the maximum changes in KX-ray production cross-section values of Fe and Zn. Copyright (c) 2017 John Wiley & Sons, Ltd.Öğe New empirical formulae for calculation of average M-shell fluorescence yields(Pergamon-Elsevier Science Ltd, 2014) Kahoul, A.; Aylikci, V.; Deghfel, B.; Aylikci, N. Kup; Nekkab, M.We have calculated and reviewed in a table form the average bulk M-shell fluorescence yield previously measured by different groups covering the period from 1955 to 2005. We have interpolated the weighted and unweighted mean values of the experimental data by using the analytical function ((omega) over bar (M)/(1-(omega) over bar (M)))(1/4) as a function of the atomic number (Z) to deduce the empirical average M-shell fluorescence yield in the atomic range of 70 <= Z <= 92. Also, we used the famous formula (omega) over bar (M) = A(Z-13)(4) to generalize the average M-shell fluorescence yield for elements with 19 <= Z <= 100. The results have been compared with other theoretical, experimental and empirical values reported in the literature and a reasonable agreement has been obtained. (C) 2014 Elsevier Ltd. All rights reserved.Öğe New procedure calculation of photon-induced K?/K? intensity ratios for elements 16S to 92U(Elsevier Science Bv, 2014) Kahoul, A.; Aylikci, N. Kup; Aylikci, V.; Deghfel, B.; Kasri, Y.; Nekkab, M.In this paper, the measured Kb/Ka intensity ratio values published in the literature from 1980 to 2011 have been reported. The weighted- and unweighted- mean values of the experimental data were fitted by the analytical function to deduce new semiempirical and empirical intensity ratios in the atomic range of 16 <= Z <= 92. The semi-empirical intensity ratios were then deduced by fitting the experimental data normalized to their corresponding theoretical values and the experimental data were directly fitted to deduce the empirical ones. The results were compared with the other theoretical and experimental values reported in the literature. Copyright (C) 2014, The Egyptian Society of Radiation Sciences and Applications. Production and hosting by Elsevier B.V. All rights reserved.Öğe Ytterbium to thorium semi-empirical average M-shell fluorescence yields(Pergamon-Elsevier Science Ltd, 2015) Khalfallah, F.; Deghfel, B.; Kahoul, A.; Aylikci, V.; Aylikci, N. Kup; Nekkab, M.By using the weighted and unweighted mean values of the experimental average M-shell fluorescence yield reported in the literature covering the period from 1955 to 2005 and the theoretical values based on the non-relativistic Hartree-Fock-Slater (HFS) calculations of McGuire (1972), we produce good estimations for the semi-empirical values of elements in the range of 70 <= Z <= 90. These values are obtained by the interpolation of the normalized weighted and unweighted mean values to their corresponding theoretical ones. The results have been compared to other theoretical, empirical and experimental data reported in the literature. Reasonable agreement has been obtained between our result and other works. (C) 2015 Elsevier Ltd. All rights reserved.
