Browsing by Subject "natural radioactivity"
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Item Natural radionuclides in the building materials used in Manisa City, Turkey(2006) Ereeş F.S.; Dayanikli Ş.A.; Çam S.The activity concentrations of 238U, 232Th and 40K in brick, cement and sand samples used as building materials in Manisa province were analysed by a gamma-ray spectroscopy coupled with a Nal (TI) detector. Doses received by the citizens living in Manisa due to these building materials were also calculated. The highest activity concentrations of 238U, 232Th and 40K found in the sand samples were 1559.10 Bq·kg-1, 142.48 Bq·kg-1 and 1711.47Bq·kg-1, respectively. The maximum mean of radium equivalent activity Raeq was 945 Bq·kg-1 calculated for levels in sand, gravel and stone samples. © 2006 SAGE Publications.Item Geochemical and radionuclide profile of Tuzla geothermal field, Turkey(2008) Baba A.; Deniz O.; Ozcan H.; Erees S.F.; Cetiner S.Z.Tuzla geothermal basin is situated in north-western Turkey on the Biga Peninsula, which is located at the west end of the Northern Anatolian Fault system. Soil and water samples were collected between August 2003 and June 2004 to initiate development of a geochemical profile of surface and subsurface waters in the geothermal basin and radionuclide concentrations in soils. All water samples were found to fall within Turkish Water Quality Class 4, meaning they were remarkably contaminated for any water consumption sector (industrial, human use or agricultural) based on sodium and chloride ions. Such waters could be used only after appropriate water treatment. The water samples are of the chloride type in terms of geochemical evaluation. Preliminary geochemical evidence shows that the N-S flowing part of the Tuzla River acts as a natural barrier within the basin. Heavy metal concentrations in the soil samples show slight elevations, especially those obtained from the east part of the basin where thermal springs are dominant. Geochemical calculations were carried out with PHREEQC® software to determine equilibrium concentration of chemical species and saturation indices, by which it is suggested that chloride is the most important ligand to mobilize the heavy metals in the studied system. In addition, the activity concentration and gamma-absorbed dose rates of the terrestrial naturally occurring radionuclides were determined in the soil using gamma-ray spectrometry. The soil activity ranged from 42.77 to 988.66 Bq kg-1 (averaging 138 Bq kg-1) for 238U, 13.27 to 106.31 Bq kg-1 (averaging 32.42 Bq kg-1) for 232Th, and 99.28 to 935.36 Bq kg-1 (averaging 515.44 Bq kg-1) for 40K. The highest value of 238U was found in the soil samples obtained from an area close to the hot spring. © Springer Science+Business Media B.V. 2007.Item Determination of radon exhalation rate and natural radioactivity levels of building materials used in Istanbul-Turkey(Kluwer Academic Publishers, 2015) Çam Kaynar S.; Özbey E.; Ereeş F.S.Radon concentrations of 63 building materials (block-form and powder-form) used in Istanbul province were measured by using solid state nuclear track detectors (CR-39). Radon exhalation rates for each other were calculated and compared to the literature. The activity concentrations of 40K, 238U and 232Th for 18 powder-form building materials (cement and sand samples) were analyzed by a gamma-ray spectrometer coupled with a NaI(Tl) detector. The activity concentrations of 40K, 238U and 232Th ranged from 2.81 to 638.9 Bqkg−1, 44.68 to 114.26 Bqkg−1 and 2.02 to 34.16 Bqkg−1, respectively. Activity of 238U in sand samples was found as higher than the world average. The activities of 40K, 238U and 232Th are compared with available data from other investigations and the world average value. Radiation hazard indices (radium equivalent activity, external hazard index and indoor hazard index) were calculated by using the activity results. The results are compared to the literature. © 2015, Akadémiai Kiadó, Budapest, Hungary.