Araştırmacılar(3)

• Baştuǧ, Arif
• Içelli, O.
• Içelli, Orhan

• ArticleYalnız künye2013/r/ebyu/17260
  Measurement of K-shell absorption jump factors and jump ratios in some lanthanide elements using EDXRF technique

  Polat, Recep; Içelli, Orhan; Yalçin, Zeynel; Pesen, Erhan; Orak, Salim

  59.5 keV gamma rays scattered by an aluminum foil have been used as a radiation source to measure the absorption jump factor and jump ratios for absorbers Ce, Pr, Nd, Sm, Eu and Tb. The theoretical and experimental values are compared with the corresponding ones in the literature.

  RDL Kalıcı Kaydıİncele
• ArticleYalnız künye2011/r/ebyu/17384
  The absorption jump factor of effective atomic number and electronic density for some barium compounds

  Polat, Recep; Yaln, Zeynel; Içelli, Orhan

  Some photonic energy absorption parameters such as the mass attenuation coefficient μt, the molecular σM, atomic σA, the electronic cross-sections σE, the effective atomic number Zeff and the electron density NE have been calculated and measured. We have gained the terms jump factor of effective atomic number JZeff and jump factor of electronic density JNE to literature with the help of these fundamental parameters. Also, we want to obtain both XAFS effect and the applicability of mixture rule. The most interesting finding in this study is that the trend of the total molecular, atomic and electronic cross-sections is getting beyond the measure by the absorption edge and these cross-sections are affected in the region of absorption edge. The obtained results have been compared with some other theoretical values given earlier.

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• ArticleYalnız künye2011/r/ebyu/17344
  X-ray spectroscopic evaluation of zinc at different applied pressure

  Içelli, Orhan

  K X-ray fluorescence cross-sections of zinc (Zn) in linear region and infinite mass thickness region are measured using Si(Li) detector at photon excitation energy of 59.5 keV. Besides, this study has investigated the effect of experimental fluorescence cross-sections on relation between two different mass thickness of the sample with different applied pressures. Harmony between linear and infinitive (critical) mass thickness region and applied pressure on sample has direct effect on experimental Kα and Kβ X-ray peaks. Experimental results were compared with various theoretical values in literature.

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• ArticleYalnız künye2010/r/ebyu/17849
  Measurement of the effective atomic numbers of compounds with cerium near to the absorption edge

  Polat, Recep; Içelli, Orhan

  In order to measure atomic, molecular and electronic cross-section; the effective atomic number, density of electron and absorption jump factor, we have first measured μt values of compounds which are determined by mixture rule using transmission method. In order to measure experimentally the effective atomic number within absorption jump factors of compounds with Ce, the X-ray source used Am-241 whose gamma rays were stopped at secondary source (Sm), thus producing Kα and Kβ X-ray emission. The most crucial finding in this study is that measurement of the effective atomic number is not appropriate near to the absorption edge and the effective atomic number is affected by near to the absorption edge. The results obtained have been compared with theoretical values.

  RDL Kalıcı Kaydıİncele
• ArticleYalnız künye2010/r/ebyu/17762
  A new term "jzeff" derived from measured total attenuation coefficients of photons near the absorption edges of some compounds

  Polat, Recep; Içelli, Orhan

  In order to determine the effect of XAFS (X-ray absorption fine structure) on Jzeff, we have measured μ/ρ values of compounds, which are determined by the mixture rule or the independent atomic model. Also, we want to obtain both XAFS effect and non-applicability or applicability of mixture rule. The most crucial finding in this study is that measurement of the effective atomic number is not appropriate near the absorption edge and the effective atomic number is affected by near the absorption edge. The results obtained have been compared with theoretical values. Also, the objective of this study is to show that there is a term "Jzeff" between effective atomic numbers and absorption jump factor.

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• ArticleYalnız künye2009/r/ebyu/17844
  Measurement of efffective atomic numbers of holmium doped and undoped layered semiconductors via transmission method around the absorption edge

  Ïçelli, Orhan

  Effective atomic numbers were measured for InSe and InSe having different Holmium concentrations measured in the energy region 15.746-40.930 keV using a Si(Li) detector. InSe:Holmium(0.0025), InSe:Holmium(0.0050), InSe:Holmium(0.025) InSe:Holmium(0.05) and InSe crystals have been grown by the Bridgman-Stocbarger method. The measured values were compared with the theoretical ones obtained using WinXCom being a Windows version of XCOM on the basis of mixture rule. The objective of this work is to show that there is a relation between effective atomic numbers and doped Ho fractions to InSe.

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• ArticleYalnız künye2009/r/ebyu/17713
  An experimental study on the linear differential scattering coefficients of the GaAs, n- and p-type Si

  Içelli, Orhan; Çankaya, Güven; Çetin, Ahmet

  The linear differential scattering coefficients at 60 keV have been measured for GaAs, p-Si and n-Si semiconductors at seven angles ranging from 60° to 120° at intervals of 10°. The results have been compared with relativistic and non-relativistic theoretical values. The objective of this work is to seek evidence whether there is a relationship between the LDSC and the scattering angle. The LDSCs have been measured with energy-dispersive X-ray fluorescence spectroscopy (EDXRF) for wafers as GaAs, n- and p-type Si. This is the first time the LDSCs have been measured at <100 keV energies, so there is no comparable findings reported in the literature.

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• ArticleYalnız künye2008/r/ebyu/17848
  Measurements of the total molecular differential attenuation coefficients of some compounds for scattering of γ-rays

  Içelli, Orhan

  The differential attenuation coefficients for total scattering have been measured using the Si(Li) detector at photon excitation energy of 59.5 keV for Fe2O3, Y2O3, Nb2O5, SeO2, Sb2O5 and BaO compounds at seven angles ranging from 60° to 120° at intervals of 10°. The obtained results have been compared with relativistic and non-relativistic theoretical values.

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• ArticleYalnız künye2008/r/ebyu/17801
  Lι, Lα, Lβ and Lγ X-ray fluorescence cross-sections of heavy elements for the exciting photons energy 38.18, 43.95, 50.21 and 59.5 keV

  Baştuǧ, Arif

  The cross-sections for the production of Lι, Lα, Lβ and Lγ X-ray fluorescence (XRF) in Er, Ta, W, Au, Hg, Tl, Pb and Bi by photons with energies in the range 38-59.5 keV have been measured, using a standard doublereflection experimental set-up. Measurements have been performed using an annular 241 Am primary source and X-ray emitting secondary-exciter system. Experimental cross-sections have been compared with the theoretically calculated values of L X-ray cross-sections and fairly good agreement is observed between the experimental and theoretical values.

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• ArticleYalnız künye2008/r/ebyu/17754
  Determination of molecular, atomic, electronic cross-sections and effective atomic number of some boron compounds and TSW

  Içelli, Orhan; Erzeneoǧlu, Salih; Boncukçuoǧlu, Recep

  The transmission of gamma-rays of some boron compounds (H3BO3, Na2B4O7) and the trommel sieve waste (TSW) have been measured by using an extremely narrow-collimated-beam transmission method in the energy range 15.74-40.93 keV. Molecular, atomic and electronic cross-sections and effective atomic numbers have been determinated on the basis of mixture rule and compared with the results obtained from theory.

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