Radiometric characterization of zeolite minerals used in many industries and assessment of radiological risks

PubMedID: 31280108Zeolites are important additives materials which are widely used in different industries such as construction, paper, paint, agriculture, textile, and fertilizer. In this study, radiometric characterization of natural zeolite samples collected from four zeolite open quarries in Western Anatolia in Turkey were determined using a gamma-ray spectrometry with high purity germanium detector. The radiological risks due to the use of zeolite samples as raw materials in cement and concrete production was assessed for adult people by estimating activity concentration index and annual effective dose due to external exposure in indoor. Also, annual effective radiation dose in outdoor and the corresponding lifetime cancer risk were estimated for quarry workers. Average activity concentrations of 226Ra, 232Th and 40K measured in seventy-seven zeolite samples were found as 85 ± 4, 129 ± 2 and 1030 ± 24 Bq kg-1, respectively. The radon emanation factor and radon mass exhalation rate of zeolite samples varied from 1 to 9% with an average of 4% and 1.8–15.1 µBq kg-1 s-1 with an average of 7.2 ± 0.3 µBq kg-1 s-1, respectively. The data were compared with criteria or limit values. The results revealed that usage of the examined zeolite samples as building raw materials would not cause any significant radiological risk. © 2019 Elsevier Lt

Study of the electronic properties of Zn0.8-4xHoxOy (0.05 <= x <= 0.09) by X-ray absorption and photoemission spectroscopy

WOS: 000357904600010The electronic structure of Zn0.8-4xHoxOy (0.05 <= x <= 0.09) was investigated using X-ray absorption near edge structure (XANES) and X-ray photoelectron spectroscopy (XPS). Samples were prepared by the solid state reaction method. Using X-ray absorption spectroscopy, the investigation of M-4,M-5 absorption edge of Ho revealed that the electronic structure was directly influenced by the Ho concentration in the Zn0.8-4xHoxOy sample whereas the crystal structure properties showed little/no correlation to the substitution of Ho. The electronic structure differs substantially from those of the reference ZnO. The O K-edge spectra suggest that the combination of the Ho with ZnO enhances the effective charge of the O ions. A systematic study on the composition from lower to higher value of Ho dopant showed the blue shift in band gaps and is discussed in the view of the electronic structure of the Zn0.8-4xHoxOy samples. The inverse susceptibility (1/chi) against temperature curves is plotted to identify the magnetic contribution. Those curves indicate that the substitution of Ho into the ZnO compound causes a weaker antiferromagnetic (AFM) interaction. (C) 2015 Elsevier B.V. All rights reserved.U.S. Department of Energy, Office of Science, Office of Basic Energy SciencesUnited States Department of Energy (DOE) [DE-AC02-76SF00515]; DOE Cooperative Research Program for SESAME project; Research Fund of Cukurova UniversityCukurova University [FEF2013BAP29, FEF2012BAP10]The authors are grateful to the Stanford Synchrotron Radiation Lightsource (SSRL), California, USA, for providing the synchrotron-based XAS facility. Use of the Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, is supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences under Contract No. DE-AC02-76SF00515. Support of the DOE Cooperative Research Program for SESAME project is acknowledged by A.H.F, O.M.O and Y.U. This work has been supported by Research Fund of Cukurova University under grant contract numbers FEF2013BAP29 and FEF2012BAP10

Structural, electronic and magnetic properties of Mn doped ZnO nanoplates synthesized by electrodeposition method

The electronic, crystallographic and magnetic properties of ZnO thin films doped with manganese (Mn) agent were studied at various Mn concentrations. The samples were prepared electrochemically, under constant electric potential conditions. All Zn1-xMnxO (x = 1, 3, 5, 7 and 10%) samples exhibit typical wurtzite crystal structure with strong (002) orientation. The grains of samples are well-shaped and highly oriented nanoplates observed from SEM measurements. There is a strong correlation between the magnetic properties and electronic structure for all samples. The XPS analysis data revealed that Mn atoms are in oxidized state rather than metallic state. In addition, electron donation from Mn to Zn has changed the electronic structure of host lattice. The magnetic properties of samples are investigated by sweeping temperature and magnetic field. It is revealed that the antiferromagnetic interactions increases with Mn content in ZnO host lattice which is addressed by the formation of Mn-O-Mn bonding from the XPS data. © 2019 Elsevier B.V.Firat University Scientific Research Projects Management Unit Türkiye Bilimsel ve Teknolojik Araştirma Kurumu British Association for PsychopharmacologyThis research was supported by the Cukurova University Scientific Research Projects Coordination Unit (BAP) under FEF2014D4 project number. Authors thank to BAP for financial support. We are also greatly thankful to the Scientific and Technological Research Council of Turkey (TUBITAK-BIDEB) 2211-C National Ph.D. Fellowship Programme

Magnetic properties of crystalline gamma-MnS thin films

WOS: 000236107300058We report temperature dependence of magnetic behavior of MnS thin films. Temperature ranges well below and above the transition point. The obtained magnetic measurements and the theoretical magnetic calculations suggest that the magnetic behavior of gamma-MnS is Curie like type at high temperatures. On the other hand in the low temperature region the magnetic arrangement is an ordered antiferromagnetic phase

Magnetic properties of crystalline ?-MnS thin films

We report temperature dependence of magnetic behavior of MnS thin films. Temperature ranges well below and above the transition point. The obtained magnetic measurements and the theoretical magnetic calculations suggest that the magnetic behavior of ?-MnS is Curie like type at high temperatures. On the other hand in the low temperature region the magnetic arrangement is an ordered antiferromagnetic phase

The structural, superconducting and transport properties of the compounds Y3Ba5Cu8O18 and Y3Ba 5Ca2Cu8O18

This work is related to the structural, superconducting, and transport properties of the compounds Y3Ba5Cu8O 18 and Y3Ba5Ca2Cu8O 18 prepared by the sol-gel method. The influence of the doping of Ca atoms into the compound Y3Ba5Cu8O18 was studied by employing XRD, SEM, AFM, EDX, DTA, TGA, and the electrical resistivity (?), Hall coefficient (R H), Hall mobility (µ H), and magnetoresistance measurements. The XRD spectra showed that Y3Ba5Ca2Cu8O18 almost has the same crystal structure as that of Y3Ba5Cu 8O18, except with some impurity peaks. The resistivity measurements have pointed out that the compounds Y3Ba 5Cu8O18 and Y3Ba5Ca 2Cu8O18 have their T c-onset temperatures at approximately 92.7 and 86.6 K, respectively. The Hall coefficients R H and Hall mobilities µ H have been measured at the 10-300 K temperature interval in a magnetic field of 0.55 T. The signs of R H and µ H are found to be positive for both samples, which indicate that the conduction is p-type in our samples. As expected, the magnetoresistance results clearly demonstrate a considerable decrease of the offset temperatures with increasing magnetic field. © 2011 Springer Science+Business Media, LLC.Acknowledgements This work is supported by the Research Fund of Çukurova University, Adana, Turkey, under grant contracts no. FEF2009BAP10, no. AMYO2009BAP1, no. FEF2009YL30. Dr. Osman Serindag^, Cukurova University, is gratefully acknowledged for the thermal measurements of the present samples. We wish to thank Aydin Eraydin for his help

Study of the L-2,L-3 edges of 3d transition metals by X-ray absorption spectroscopy

WOS: 000261693900103In the soft X-rays energy region, near edge X-ray absorption fine structure (NEXAFS) spectra are generally recorded by monitoring yield signals of secondary particles. These secondary particles, electrons or fluorescence photons, follow from the decay of the core hole excited in the primary absorption process. In general the yield signals are, to a good approximation, proportional to the absorption coefficient. However, in several applications it would be desirable to measure the absorption coefficient quantitatively. To derive the absorption coefficient quantitatively from a yield spectrum, one needs to know the escape depth of the emitted electrons (Ne) of the applied yield technique in the material of interest. Since this quantity is difficult to calculate, it is unknown for most materials. In this paper we present the first results of our systematic investigation of the total electron-yield (TEY) escape depth of the 3d transition metals (Fe, Co and Cu). In addition our results gave important information on the variation of the TEY escape depth with the filling of the 3d band. (C) 2008 Elsevier B.V. All rights reserved.Department of Energy, Office of Basic Energy Science; SSRL University of Cukurova; DOE Cooperative Research ProgramThe authors express their thanks to Curtis Troxel for his support at the Stanford Synchrotron Radiation Laboratory (SSRL), where the NEXAFS experiments have been carried out. SSRL is supported by the Department of Energy, Office of Basic Energy Science. Support by SSRL University of Cukurova and the DOE Cooperative Research Program for SESAME project is acknowledged by Y.U

Erratum: The structural, superconducting and transport properties of the compounds Y 3Ba 5Cu 8O 18 and Y 3Ba 5Ca 2Cu 8O 18 (Journal of Superconductivity and Novel Magnetism DOI: 10.1007/s10948-011-1192-7)

[No abstract available

Electronic structures of organic salts (DI-DCNQI) 2 M(M Cu and Ag) using photoelectron spectromicroscopy

The electronic structures of organic salts (DI-DCNQI) 2 M with M Cu and Ag, where DI-DCNQI is 2,5-diiodo-N,N # - dicyanoquinonediimine, were studied using photoelectron spectromicroscopy at various photon energies. From the photon energy dependence of the photoionization cross-section, the atomic orbital characters of the observed spectral features were determined. For both (DI-DCNQI) 2 Cu and (DI-DCNQI) 2 Ag, the C and N 2p states originating in the cyano group and the quinone ring are located at # 4.0 and # 6.5 eV, respectively. The Cu 3d states for (DI-DCNQI) 2 Cu and the Ag 4d states for (DI-DCNQI) 2 Ag are located at # 3.2 and # 5.2 eV, respectively. This indicates that the p#--d hybridization at the Fermi level between the M ions and the N atoms of the DCNQI columns is larger for (DI-DCNQI) 2 Cu than for (DI-DCNQI) 2 Ag. The reason for the difference in the electronic structure between (DI-DCNQI) 2 Cu and (DMe-DCNQI) 2 Cu is also discussed. # 1999 Elsevier Science Ltd. All rights reserved