Natural and artificial radionuclide activity concentrations in surface sediments of Izmit Bay, Turkey

Measurement of natural and 137Cs radioactivity concentrations at Izmit Bay (Marmara Sea), Turkey

“…The Chernobyl nuclear power plant disaster may cause presence of the 137 Cs, and its radioactivity concentrations are higher in the samples (S1, S2, S5) collected from the industrialized part of the bay. Similar conclusions were also reported in former study at around our sampling location [6].…”

Evaluation of radioactive pollution in sediment samples of Borçka Dam Lake, Turkey

“…Radium equivalent activity is calculated using the equation given below [23]. = + 1.43 ℎ + 0.077 (3) where, CRa, CTh and CK were the activities of 226 Ra, 232 Th and 40 K (Bq kg -1 ), respectively. The results of radium equivalent activities (Raeq) for sediment are presented in Table 4.…”

“…Human source radionuclides, accidents in nuclear reactors, and fission products resulting from nuclear tests or industrial activities are also sources of pollution that may have a significant impact on the water environment [2]. Natural and anthropogenic radioisotopes can be transported to different distances after different processes and finally accumulate in sediment particles [3][4]. Due to the Chernobyl nuclear power plant accident, the Marmara and the Black Sea region of Turkey was contaminated with high artificial radioisotopes [5].…”

Radioactivity levels in mussels and sediments of the Golden Horn by the Bosphorus Strait, Marmara Sea

“…Cesium-137 and 40 K, both monovalent ions, were associated (correlation 0.41) although not at a statistically significant probability level (Table 6). However, between 137 Cs and organic matter in the sediments correlation was of 0.37, i.e., not statistically significant, although it has been calculated higher in previous reports for other areas (Table 6) (Kim et al, 2006;Kılıç and Çotuk, 2011;Ergül et al, 2013). We hypothesized that the behavior of these radionuclides might be conditioned by the strong input of organic matter from urban sewage.…”

“…matter content, and stable metal ions content. For instance, it is well known that clay minerals accumulate contaminants because of its superior CEC (cation exchange capacity) and high surface/volume ratio (Topçuoglu et al, 2003;Tsabaris et al, 2007) and organic matter affects radionuclide binding to sediments (Kılıç and Çotuk, 2011;Ergül et al, 2013).…”