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Öğe An investigation of gamma ray mass attenuation from 80.1 to 834.86 keV for fabric coating pastes used in textile sector(Springer Singapore Pte Ltd, 2020) Erenler, Alev; Bayram, Tuncay; Demirel, Yusuf; Cengiz, Erhan; Bayrak, RızaIn the present study, we investigate several textile coating pastes used in the market based on their radiation protection capability for gamma rays. The gamma ray mass absorption coefficients of some coating pastes doped with antimony, boron and silver elements have been investigated. It has been determined that the gamma ray mass attenuation coefficient decreases rapidly as the energy of the gamma rays increases. It was determined that the doping of the main printing paste with silver and antimony considerably increased the gamma ray absorption capability of main paste. However, the doping of the paste with boron reduces the mass absorption of gamma rays. In particular, the gamma ray mass absorption power of the main paste doped with silver and antimony was determined to be useful in the gamma energy range from 80 to 140 keV. This indicates that the newly doped textile material may be considered for radiation protection in the case of low-energy gamma rays .Öğe Assessment of natural radioactivity and radiological risk of sediment samples in Karacaören II dam Lake, Isparta/Turkey(Alanya Alaaddin Keykubat Üniversitesi, 2019) Apaydın, Gökhan; Köksal, Oğuz Kağan; Cengiz, Erhan; Tıraşoğlu, Engin; Baltaş, Hasan; Karabulut, Kazım; Söğüt, ÖmerThis research aimedto assess natural radioactivity levels in lake sediment of Karacaören II Dam.In this study sediment samples were collected from 12 station of lake in May,2016. The natural radionuclides 226Ra, 232Th and 40K were measured with a coaxialHPGe detector (Canberra, GC 1519 model) of 15% relative efficiency and aresolution of 1.9 keV at the 1332 keV gamma of 60Co. In order to assess the radiological hazards resulting from naturalradioactivity, radium equivalent activities (Raeq), absorber dose rate (D), internal (Hin)and external (Hex) hazard index,annual effective dose rate (AED) andExcess life time cancer risk (ELCR)were calculated and compared with recommended values of internationalorganizations.Öğe Assessment of the mass attenuation parameters with using gamma-rays for manganese substituted nano hydroxyapatite(Pergamon-Elsevier Science Ltd, 2019) Köksal, Oğuz Kağan; Apaydın, Gökhan; Tozar, Ali; Karahan, İsmail Hakkı; Cengiz, ErhanManganese substituted hydroxyapatite nanoparticles (nMnHAp) were produced using the ultrasonic wet chemical method. The elemental analysis was performed using Scanning Electron Microscopy (SEM) with integrated Energy Dispersive X-ray Spectrometry (EDX). The mass attenuation coefficients of manganese substituted hydroxyapatite nanoparticles have been measured at 59.5 keV gamma energy emitted from Am-241 radioisotope annular source with 50 mCi activity by using Ultra Low Energy Germanium Detector. These values are found to be in good agreement with theoretical values based on calculated XCOM data. Electron densities and effective atomic numbers were calculated by using the mass attenuation coefficients. Also, the mass attenuation coefficient of the real bone was determined as experimentally. The obtained results may provide information on how much radiation is transmitted through the sample when they are exposed to gamma-rays at 59.5 keV by comparing real bone.Öğe Determination of valence electronic structure of Ni in Ni-B alloy coatings using K-beta-to-K-alpha X-ray intensity ratios(Pergamon-Elsevier Science Ltd, 2019) Cengiz, Erhan; Köksal, Oğuz Kağan; Apaydın, Gökhan; Karahan, İsmail Hakkı; Ünal, ErsinIn this study, K-beta-to-K-alpha X-ray intensity ratios of Ni in Ni-B alloy coatings were investigated. These samples were excited by 59.5 keV gamma-rays from a Am-241 annular radioactive source. K X-rays emitted by the samples were counted using an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV. The K-beta-to-K-alpha X-ray intensity ratios of Ni-B alloys are compared with pure Ni and each other. Deviations between the results were explained by the change in valence electronic structures of Ni in Ni-B alloy coatings.Öğe Elemental analysis for iron, cobalt, copper and zinc decorated hydroxyapatite synthetic bone dusts by EDXRF and SEM(Elsevier Science Bv, 2019) Köksal, Oğuz Kağan; Wrobel, Pabel; Apaydın, Gökhan; Cengiz, Erhan; Lankosz, Marek; Tozar, Ali; Özkalayci, FatihIron, cobalt, copper and zinc decorated hydroxyapatite nanoparticles were produced with using ultrasonically assisted wet chemical method. Calcium nitrate tetra hydrate and dibasic ammonium phosphate were used as calcium and phosphorous source, respectively. Calcium nitrate tetra hydrate and dibasic ammonium phosphate solutions were prepared by dissolving the salts in distilled water and at different concentrations of decorated elements (iron, cobalt, copper and zinc) were appended to the calcium nitrate tetra hydrate solution. Stoichiometric decorated hydroxyapatite nanoparticles were analysed by energy dispersive X-ray fluorescence (EDXRF) with using standard method and the element analysis was determined with looking at the grain structures by Energy Dispersive X-Ray (EDX) and scanning electron microscopy (SEM). Not only have the concentrations of decorated metals but also calcium and phosphorus ratio for artificial bone powders been determined. As a result, calcium and phosphor ratio and metal decorated contents were evaluated according to the production values and compared previous studies. The answer to the question of how much of the contribution amounts was searched.Öğe Evaluation of ecological risk, source, and spatial distribution of some heavy metals in marine sediments in the Middle and Eastern Black Sea region, Turkey(2022) Apaydın, Aylin; Kabaoğlu, Hatice; Apaydın, Gökhan; Şirin, Murat; Cengiz, Erhan; Köksal, Oğuz Kağan; Baltaş, Hasan; Tıraşoğlu, EnginIn the present study, the concentration levels of heavy metals such as Mn, Fe, Ni, Cu, Zn, Cr, and Pb in sediment samples collected from 16 sampling locations in the Middle and Eastern Black Sea regions, Turkey, were measured using energy dispersive X-ray fluorescence spectroscopy (EDXRF). Various pollution parameters and methods, such as the enrichment factor (EF), geo-accumulation index (Igeo), contamination factor (CF), pollution load index (PLI), ecological risk index (RI), and geo-spatial distribution patterns, were used to assess the pollution status, ecological risks, and sources of metals in sediment in detail. The mean concentrations of Mn, Fe, Ni, Cu, Zn, Cr, and Pb were found to be 565.38, 46,000, 34.38, 104.06, 109.88, 87.31, and 32.31 mg/kg, respectively. Results showed that the mean concentrations of Cu, Zn, and Pb exceeded the crustal shale value, with the exception of Mn, Fe, Ni, and Cr. According to the calculated pollution parameters, although minimal or moderate pollution was detected in the area investigated, it was determined that there was a very low ecological risk. Multivariate statistical analysis results showed that Cu, Zn, and Pb levels in the investigated region were slightly influenced by anthropogenic inputs such as mining and agricultural practices. In addition, the geo-spatial distributions of Cu, Zn, Fe, and Pb were found to be higher in this region due to the mining activities carried out in the Eastern Black Sea region.Öğe Examination of polymeric azomethine compounds and their transition metal complexes by using XRF and XRD technique(Office Spectroscopy & Spectral Analysis, 2020) Söğüt, Ömer; Kara, Betül Demirezen; Apaydın, Gökhan; Cengiz, Erhan; Kazancı, AyşeIn this study, the electronic transition properties and structural analysis of the metal complexes (Ni (II), Co(II), Cu( II) and Mn( II)) of three different polymer ligands were performed by using XRF and X-ray diffraction (XRD) techniques, respectively. The structural analysis of the polymers and their complexes were performed by XRD technique and some of the polymers were found to be in the face-centred cubic (fcc) structure. In addition, the values of the present K X-ray intensity ratios are significantly greater than the values reported in literature.Öğe Examination of the change of the characteristic X-rays of the Zinc in fluorine- and boron-doped ZnO thin films(Polish Acad Sciences Inst Physics, 2018) Söğüt, Ömer; Kerli, Süleyman; Cengiz, Erhan; Apaydın, GökhanIn this study, K-beta / K-alpha X-ray intensity ratios of zinc in pure zinc, undoped ZnO thin film and boron and fluorine-doped ZnO thin films have been investigated. These samples have been excited by 59.5 keV gamma-rays from a Am-241 annular radioactive source. K X-rays emitted by the samples have been counted using an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV. The K-beta / K-alpha X-ray intensity ratios of the doped ZnO thin films have been compared with that of the undoped ZnO thin film. The deviations between the results can be explained by delocalization and/or charge transfer phenomena causing change in valence electronic configuration of zinc.Öğe Investigation of mass attenuation coefficients ofcopper-silverthin films at 14.93-48.82keVenergy range(Wiley, 2020) Söğüt, Ömer; Cengiz, Erhan; Yavuz, MusabIn this study, the mass attenuation coefficients of copper-silver thin-film alloys, produced by the thermal evaporation method at various concentrations, were measured at six different energies in the range of 14.93-48.82 keV (keV) by X-ray Fluorescence technique (XRF). A(241)Americium radioisotope source, having 50 mCi intensity and 59.54 keV energy photons, was used to stimulate the samples, and an Ultra-LEGe detector was used to count the characteristic X-rays emitted from the samples and from the source. At 14.93, 17.44, and 23.10 keV energies, the mass attenuation coefficients of Cu-Ag thin-film alloys increased with increasing Cu concentration, while decreasing with increasing Cu concentration at 27.37, 32.068, and 48.82 keV energies. However, at 14.93, 17.44, and 23.10 keV energies, the mass attenuation coefficients decreased with increasing Ag concentration, while increasing with increasing Ag concentration at 27.37, 32.068, and 48.82 keV energies. The obtained results were compared with the values theoretically predicted by XCOM, and the experimental results are in good agreement with theoretical values within the error limits.Öğe Investigation on Li (i = l, ?, and ?)–to-L? X-ray Intensity Ratios of Tl in Thallium Compounds(2019) Cengiz, ErhanThe Li (i = l, ?, and ?)–to-L? X-ray intensity ratios of Tl in some thallium compounds were measured by EDXRF spectrometer. These compounds were excited by 59.5 keV gamma-rays from a 241Am annular radioactive source. L X-rays emitted by the compounds were counted using an Ultra-LEGe detector with a resolution of 150 eV at 5.9 keV. Li –to-L? X-ray intensity ratios of Tl in these compounds are compared with that of the pure Tl calculated theoretically. While the values of Ll/L? and L?/L? intensity ratios are compatible with the theoretically calculated value, the values of L?/L? intensity ratios have differences.
