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Öğe Assessment of human health risk from heavy metals levels in water and tissues of two trout species (Oncorhynchus mykiss and Salmo coruhensis) from the Frtna and Guneysu Rivers in Turkey(Taylor & Francis Inc, 2017) Dizman, Serdar; Görür, Filiz Korkmaz; Keser, RecepHuman health risks were evaluated from consumption of heavy metal contaminated fish from the Firtina and Guneysu Rivers in Rize. The study was aimed to assess heavy metal load in water and two fish species. The potential human health risk due to consumption of Oncorhynchus mykiss and Salmo coruhensis was assessed by estimating average daily intake (EDI), target hazard quotient (THQ) and hazard index (HI) of metals. Our results showed that the levels of heavy metals in both water and two fish species are lower than the acceptable limit recommended by Food and Agricultural Organization (FAO) and World Health Organization (WHO).Öğe The assessment of radioactivity and radiological hazards in soils of Bolu province, Turkey(Taylor & Francis Ltd, 2019) Dizman, Serdar; Görür, Filiz Korkmaz; Keser, Recep; Görür, OsmanThe radioactivity levels in soil samples of Bolu province of north-western Turkey have been determined. There has been no information about radioactivity measurement reported in soil samples in Bolu province so far. For this reason, the activity concentrations of natural and artificial radionuclides (Ra-226, Th-232, K-40, and Cs-137) were measured in soil samples collected from 40 different points in Bolu province of north-western Turkey using gamma spectrometry technique with a high-purity germanium detector. The average activity concentrations (range) of (22)6Ra, Th-232, K-40, and Cs-137 were found to be 18.2 (3.8-49.9) Bq/kg, 17.3 (4.1-37.9) Bq/kg, 258.3 (64.6-518.9) Bq/kg, and 7.5 (0.6-43.6) Bq/kg, respectively. At the end of the analysis, the radioactivity values were lower than the world average values reported by United Nations Scientific Committee on Effects of Atomic Radiation (UNSCEAR). In order to evaluate the radiological hazards resulting from natural radioactivity, radium equivalent activity (Ra-eq), gamma index (I-gamma), external hazard index (H-ex), absorbed dose rate in air (D), annual gonadal dose rate (AGDE), the annual effective dose rate (AEDE), and excess life time cancer risk (ELCR) were calculated and found in the range of 14.8-129.8 Bq/kg, 0.1-0.5, 0.0-0.4, 7.0-60.2 nGy/h, 49.8-417.5 mu Sv/y, 8.6-73.8 mu Sv/y, and 0.3 x 10(-4) to 2.6 x 10(-4), respectively. These results were compared with recommended values (370 Bq/kg for Ra-eq, <1 for I-gamma, <1 for H-ex, 55 nGy/h for D, 300 mu Sv/y for AGDE, 70 mu Sv/y for AEDE, and 2.9 x 10(-4) for ELCR) by European Commission (EC), UNSCEAR and International Commission on Radiological Protection (ICRP). As a result, health hazards originated by natural radiation from soil samples of the Bolu province is low and insignificant.Öğe Determination of radioactivity levels and hazards of sediment and rock samples in Ikizdere and Kaptanpasa Valley, Turkey(Ijrr-Iranian Journal Radiation Res, 2013) Keser, Recep; Görür, Filiz Korkmaz; Alp, İbrahim; Okumuşoğlu, Nazmi TuranBackground: The radioactivity levels in sediment and rock samples of Ikizdere and Kaptanpasa Valley have been determined. To our knowledge, there seems to be no information about radioactivity level in the Ikizdere and Kaptanpasa Valley sediments and rocks so far. Materials and Methods: The average radium equivalent activity (Ra-eq), the total absorbed dose rate (D), the external risk index (H-ex) and the annual effective dose equivalent (AEDE) which will be defined later have been calculated and compared with the results in literature. Rock characterization was also investigated using thin section and X-ray diffraction (XRD) analysis. Also gross alpha and beta activity concentrations were calculated for some rock samples. Results: Their radiological implications were also calculated and compared with the international recommended values. The gross a activity is generally lower than the corresponding gross beta activity for some rock samples. Rock characterization was also investigated using thin section and XRD analysis. Conclusion: This study can be used as a baseline for future investigations and the data obtained in this study may be useful for natural radioactivity mapping. It seems necessary to determine the radioactivity concentrations in sediments and rock of other parts of Turkey. The results may also be used as a reference data for monitoring possible radioactivity pollutions in future.Öğe Determination of radioactivity levels of soil samples and the excess of lifetime cancer risk in Rize province, Turkey(Ijrr-Iranian Journal Radiation Res, 2016) Dizman, Serdar; Görür, Filiz Korkmaz; Keser, RecepBackground: Turkey, especially the northern part of it, was one of the countries which were contaminated by the Chernobyl accident. Rize is a city located in the Northeastern district of Turkey which was heavily influenced by the Chernobyl nuclear accident. Materials and Methods: In this study, the activity concentrations of natural (Ra-226, Th-232, K-40) and artificial (Cs-137) were measurements in soil samples collected from 132 different points in Rize province of Turkey using gamma spectrometry with a high-purity germanium detector. Results: The average activity concentrations of Ra-226, Th-232 and K-40 were found to be 85.75 11.77, 51.08 9.42, and 771.57 37.65 Bq/kg in soil samples, respectively. In order to evaluate the radiological hazard of the natural radioactivity, radium equivalent activity (Ra-eq), representative level index (I-gamma r), the external hazard index (Hex), the total absorbed dose rate (D), the annual effective dose equivalent (AEDE) and excess life time cancer risk (ELCR) have been calculated and compared with the internationally approved values. Conclusion: The outdoor air absorbed dose rates (D) due to terrestrial gamma rays for soil have been calculated because of agricultural area and living in the surrounding. It is important to determine background radiation level in order to evaluate the health hazards. Annual effective gamma doses and the lifetime risks of cancer were higher than the world's average. Moreover compared to the World's average, the lifetime risk of cancer doubled for most of the localities.Öğe Radioactivity and heavy metal concentrations of some commercial fish species consumed in the Black Sea Region of Turkey(Pergamon-Elsevier Science Ltd, 2012) Görür, Filiz Korkmaz; Keser, Recep; Akçay, Nilay; Dizman, SerdarMarine fish is an important daily diet item for the people of Turkey. The Black Sea Region of Turkey was contaminated by the Chernobyl accident in 1986, a comprehensive study was planned and carried out to determine the radioactivity levels (Ra-226, Th-232, K-40 and Cs-137) and heavy metal concentrations (As, Mn, Fe, Cr, Ni, Zn, Cu and Pb) in four of the most common fish species: Engraulis encrasicholus (anchovy), Oncorhynchus mykiss (trout), Trachurus mediterranus (bluefin) and Merlangius merlangus (whiting) samples collected from eight stations in the Black Sea Region of Turkey during 2010. The dose due to consumption of fish by the public was estimated and it was shown that this dose imposes no threat to human healthy. The concentrations of heavy metal are below the daily intake recommended by the international organizations. (C) 2011 Elsevier Ltd. All rights reserved.
