Determination of sedimentation rates in Izmir Bay using Pb-210 radionuclide

WOS: 000417222800015In this study, using the constant rate of supply model, sedimentation rates of Izmir Bay were calculated and discussed. For this purpose, eight sediment cores were collected from inner part of the bay and sedimentation rates were calculated from vertical distribution of Pb-210. Pb-210 activities were determined indirectly from Po-210 activities. Sedimentation rates ranged from 0.10 to 0.52 cm/year. The highest sedimentation rates were determined in stations close to the Poligon stream. It was concluded that main transporting mechanism for sediments is river and streams in the area. In addition, sediment cores taken from the harbor were mixed due to bioturbation, water circulation and/or other factors

Determination of radon and radium concentrations in drinking water samples around the city of Kutahya

WOS: 000322511500012PubMed ID: 23417055The concentration of radium and radon has been determined in drinking water samples collected from various locations of Kutahya city, Turkey. The water samples are taken from public water sources and tap water, with the collector chamber method used to measure the radon and radium concentration. The radon concentration ranges between 0.1 and 48.61.7 Bq l(1), while the radium concentration varies from a minimum detectable activity of 0.020.70.2 Bq l(1) in Kutahya city. In addition to the radon and radium levels, parameters such as pH, conductivity and temperature of the water, humidity, pressure, elevation and the coordinates of the sampling points have also been measured and recorded. The annual effective dose from radon and radium due to typical water usage has been calculated. The resulting contribution to the annual effective dose due to radon ingestion varies between 0.3 and 124.2 Sv y(1); the contribution to the annual effective dose due to radium ingestion varies between 0 and 143.3 Sv y(1); the dose contribution to the stomach due to radon ingestion varies between 0.03 and 14.9 Sv y(1). The dose contribution due to radon inhalation ranges between 0.3 and 122.5 Sv y(1), assuming a typical transfer of radon in water to the air. For the overwhelming majority of the Kutahya population, it is determined that the average radiation exposure from drinking water is less than 73.6 Sv y(1).Dumlupinar UniversityDumlupinar University [2008-16]This work was supported by Dumlupinar University Scientific Research Project [2008-16]

Soil gas radon concentrations along the Ganos Fault (GF)

WOS: 000432106300016In this study, soil radon levels have been measured for the first time across the Ganos fault (GF), which is known as the western part of the North Anatolian Fault Zone. LR 115 Type 2 Solid State Nuclear Track Detectors (time integrated) have been applied to determine soil gas radon levels, and the survey was performed in 16 stations along the fault line. The results showed that soil gas radon concentrations and variation of concentration levels are comparable high along the fault line. It is also observed that in the middle of the Ganos Fault, fairly elevated radon levels were detected. These can be related to the activity of the fault lines. It is confirmed that the study area has a very active tectonic structure and is great location for analyzing radon variations

Compressive strength, water absorption, water sorptivity and surface radon exhalation rate of silica fume and fly ash based mortar

WOS: 000461445700033In this study, the effect of partial cement replacement with silica fume and fly ash on the compressive strength, water absorption, volume of permeable pore, water sorptivity, radon content and surface radon exhalation rate of mortar mixtures were investigated. It was observed that the compressive strength of mortar mixtures containing silica fume as partial cement replacement increased as the amount of silica fume content increased while the water absorption, volume of permeable pore, water sorptivity and radon exhalation rate of mortar mixtures decreased. The decrease in surface radon exhalation rate was ranged between 23% and 43% while that of mortar mixtures containing fly ash increased up to 15% of the rate of the control mortar mixture. Results showed that silica fume addition decreased the radon concentration and surface radon exhalation rate while fly ash showed a detrimental effect.Scientific and Technological Research Council of TurkeyTurkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [214M039]The authors are thankful to Ms. Tugce Karatas and Mr. Zafer Ozen for their help with sample preparation and experiments. This study was funded by the Scientific and Technological Research Council of Turkey (Project number: 214M039)

Soil gas radon concentrations measurements in terms of great soil groups

WOS: 000329415800021PubMed ID: 24012765In this study, soil gas radon concentrations were investigated according to locations, horizontal soil layers and great soil groups around Tuzla Fault, Seferihisar-Izmir. Great soil groups are a category that described the horizontal soil layers under soil classification system and distributions of radon concentration in the great soil groups are firstly determined by the present study. According to the obtained results, it has been showed that the radon concentrations in the Koluvial soil group are higher than the other soil groups in the region. Also significant differences on location in same great soil group were determined. The radon concentrations in the Koluvial soil groups were measured with respect to soil layers structures (A, B, Cl, and C2). It has been observed that the values increase with depth of soil (C2>C1>B>A). The main reason may be due to the meteorological factors that have limited effect on radon escape from deep layers. Although fault lines pass thought the study area radon concentrations were varied location to location, layer to layer and great group to great group. The study shows that a detailed location description should be performed before soil radon measurements for earthquake predictions. (C) 2013 Elsevier Ltd. All rights reserved.Scientific and Technical Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [109Y213]This research work was supported by the grants from The Scientific and Technical Research Council of Turkey (TUBITAK) Contract No: 109Y213. We are also thankful for the support of the Journal of Environmental Radioactivity Editor, Dr. Paul Martin, and the reviewers of our manuscript; the final form of our manuscript was greatly enriched by their suggestions