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    Indoor and outdoor Radon concentration measurements in Sivas, Turkey, in comparison with geological setting
    (Elsevier Sci Ltd, 2010) Mihci, Metin; Buyuksarac, Aydin; Aydemir, Attila; Celebi, Nilgun
    Indoor and soil gas Radon (Rn-222) concentration measurements were accomplished in two stages in Sivas, a central eastern city in Turkey. In the first stage, CR-39 passive nuclear track detectors supplied by the Turkish Atomic Energy Authority (TAEA) were placed in the selected houses throughout Sivas centrum in two seasons; summer and winter. Before the setup of detectors, a detailed questionnaire form was distributed to the inhabitants of selected houses to investigate construction parameters and properties of the houses, and living conditions of inhabitants. Detectors were collected back two months later and analysed at TAEA laboratories to obtain indoor Rn-222 gas concentration values. In the second stage, soil gas Rn-222 measurements were performed using an alphameter near the selected houses for the indoor measurements. Although Rn-222 concentrations in Sivas were quite low in relation with the allowable limits, they are higher than the average of Turkey. Indoor and soil gas Rn-222 concentration distribution maps were prepared seperately and these maps were applied onto the surface geological map. In this way, both surveys were correlated with the each other and they were interpreted in comparison with the answers of questionnaire and the geological setting of the Sivas centrum and the vicinity. (C) 2010 Elsevier Ltd. All rights reserved.
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    Using caesium-137 measurements to investigate soil erosion rates in western Istanbul (NW Turkey)
    (2005) Haciyakupoglu, Sevilay; Ertek, T. Ahmet; Walling, Des E.; Ozturk, Z. Fatih; Karahan, Gursel; Erginal, A. Evren; Celebi, Nilgun
    Buyukcekmece Reservoir, located in the western outskirts of Istanbul, is one of the major water resources of Istanbul, and supplies drinking water to about 4 million people. Erosion in the catchment of the reservoir is an important problem in terms of its longer-term sustainability for water supply. There is an urgent need to obtain reliable quantitative data regarding erosion and deposition rates within the catchment to assess the magnitude of the problem and to plan catchment management strategies. In the absence of existing data, attention has focussed on the potential for using 137Cs measurements to provide retrospective estimates of medium-term soil erosion rates within the catchment over the past ca. 40 years. To date, the 137Cs approach has not been used to document soil redistribution rates in Turkey and this contribution reports an attempt to confirm the viability of the approach and the results of a preliminary investigation of rates of soil loss from uncultivated areas within the catchment. The soil redistribution rates estimated using the profile distribution conversion model varied from - 16.11 (erosion) to 4.59 (deposition) t/ha/year. © 2005 Elsevier B.V. All rights reserved.