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    Determination of radioactivity level of water supply network in Trabzon province, Turkey
    (Taylor & Francis Ltd, 2021) Kucukomeroglu, Belgin; Sen, Aysegul; Duran, Selcen Uzun; Ciris, Ali; Taskin, Halim; Ersoy, Hakan
    In the present study, the radioactivity levels of water samples collected from the main water supply network in Trabzon province and districts and soil samples taken from the vicinity of the water network were measured. An Alphaguard-PQ2000 radon gas detector was used to determine the seasonal radon gas level in the water samples. An HPGe detector was used to determine the level of radioactivity in soil and water samples. The average concentration of Rn-222 in drinking water ranges from 0.56 +/- 0.51 to 13.3 +/- 5 Bq L-1. In water samples, average gross alpha and gross beta values were measured as 8 +/- 1 and 43 +/- 1 mBq L-1, respectively. The average concentrations of U-238, Th-232, Cs-137, K-40 radionuclides in soil were measured as 51 +/- 2, 21 +/- 2, 16 +/- 1, 28 +/- 7 Bq m(-3), respectively. The average concentrations of U-238, Th-232, Cs-137, K-40 radionuclides in drinking water were measured as 147 +/- 5, 25 +/- 2, 77 +/- 2, 12 +/- 2 mBq L-1, respectively. When the radon concentrations for drinking water were examined, it was found that the radon concentration of the three samples was above the limit value (11 Bq L-1) allowed by the US-EPA for drinking water. All other results are below the limit values.
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    Differential quadrature method for frequency analysis of membranes having irregular domains using an eight-node curvilinear element
    (TECHNO-PRESS, 2009) Ersoy, Hakan; Ozpolat, Lutfiye; Civalek, Omer; Ozturk, Baki
    [Abstract Not Available]
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    Gamma-ray absorbing characteristic of obsidian rocks as a potential material for radiation protection
    (Pergamon-Elsevier Science Ltd, 2022) Duran, Selcen Uzun; Kucukomeroglu, Belgin; Ciris, Ali; Ersoy, Hakan
    In this study, natural radionuclide levels and mass absorption coefficients of obsidian samples were examined to determine their gamma radiation properties. Fourteen obsidian samples were collected from 7 different locations in Rize province, Ikizdere region, Turkey. X-ray fluorescence measurements of the samples revealed the silica structure and comparable elemental structure with slight differences in atomic ratios. Radionuclide analysis showed that the Cs-137 activity was below the detection limit, and the mean activities of U-238, Th-232 and K-40 were 93 +/- 9, 67 +/- 7, 1027 +/- 19 Bq.kg(-1), respectively. The average experimental mass absorption coefficients at 81.0 keV, 302.9 keV, 356.0 keV and 661.7 keV were found to be 0.216, 0.108, 0.098 and 0.080 cm(2) g(-1), respectively. In the <100 keV region which the photoelectric effect is dominant, differences among the absorption coefficients were more pronounced, while it was relatively much smaller in the intermediate energy region. Also, it was seen that the absorption coefficients of the samples were higher than many materials, especially in the low energy region. The average half-value thicknesses showed that obsidian between 1.43 cm and 3.84 cm depending on the photon energy should be used to halve the radiation intensity. In addition, it was determined that the thicknesses in the range of 4.75 cm-12.76 cm were sufficient to reduce the intensity to one tenth. Considering all the analysis results, it can be said that obsidian is a potential material in radiation protection and its absorption properties can be improved by processes such as elemental doping.