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Öğe CHARACTERIZATION OF MASS ATTENUATION COEFFICIENTS AS A FUNCTION OF EXPERIMENTAL GEOMETRY(Taylor & Francis Inc, 2015) Demir, FarukMass attenuation coefficients of H2O, PbO, and cellulose were determined using 59.5keV gamma energies with CdTe and NaI (Tl) detectors at five different source-sample distances. The pencil beam method was used to measure the mass attenuation coefficients. All experimental mass attenuation coefficients were compared with simulated results. A linear relationship between source-sample distance and mass attenuation coefficients was determined by regression analysis. The correlation coefficients were 0.99, 0.96, and 0.98 for cellulose, H2O, and PbO using a NaI (Tl) detector, while the values were 0.98, 0.99, and 0.99 with the Cd(Te) detector. If the beams were emitted as a narrow beam instead of as a pencil beam, a constant relationship instead of a linear increase was observed for the mass attenuation coefficients as a function of distance. Consequently, the narrow beam method was superior to the pencil beam approach.Öğe Determination of attenuation coefficients of heavyweight concretes containing colemanite by using 133Ba radioactive isotope source(American Nuclear Society, 2014) Demir, Faruk; Budak, G.; Sahin, R.; Karabulut, A.; Oltulu, M.; Ün, A.[No abstract available]Öğe The determination of mass attenuation coefficients through experimental and theoretical approaches using glass materials(Soc Glass Technology, 2018) Demir, Faruk; Ermis, SerifThe mass attenuation coefficients, mu/rho of x(PbO or Bi2O3):(100-x)(SiO2 or B2O3) (x=30, 40, 50, 60, 70) glasses at 662 keV were measured according to the data available in the literature on borate glasses and silicate glasses. Theoretical mass attenuation coefficients were calculated by WinXCom software. Theoretical and experimental mu/rho increased with increasing heavy metal oxide concentration in glass materials. The value of regression analysis as a result of the relationship was calculated to be about 0.999 for the experimental results of both borate glasses and silicate glasses. Such a relationship was not found for the experimental results.Öğe Determination of mass attenuation coefficients, effective atomic numbers and effective electron numbers for heavy-weight and normal-weight concretes(Pergamon-Elsevier Science Ltd, 2013) Un, Adem; Demir, FarukTotal mass attenuation coefficients, effective atomic numbers and effective electron numbers values for different 16 heavy-weight and normal-weight concretes are calculated in the energy range from 1 keV to 100 GeV. The values of mass attenuation coefficients used in calculations are taken from the WinXCom computer program. The obtained results for heavy-weight concretes are compared with the results for normal-weight concretes. The results of heavy-weight concretes fairly differ from results for normalweight concretes. (C) 2013 Elsevier Ltd. All rights reserved.Öğe Radiation transmission of colemanite, tincalconite and ulexite for 6 and 18 MV X-rays by using linear accelerator(Pergamon-Elsevier Science Ltd, 2013) Demir, Faruk; Un, AdemTincalconite, ulexite and colemanite are boron ores. Since these ores include boron, hydrogen and many other elements, these boron ores may be used as shielding materials instead of Pb metal and paraffin wax. In this study, measurements have been made to determine radiation transmission of tincalconite, ulexite and colemanite by transmission method for 6 and 18 MV using linear accelerator (LINAC) with ionization chamber. The experimental results were compared to the results of WinXCom X-ray computer program's. In pair production region, ores such as colemanite, ulexite and tincalconite can be preferred as shielding materials to prevent photon and neutron particle radiations. (C) 2012 Elsevier Ltd. All rights reserved.
