An overview of the ecological half-life of the 137 Cs radioisotope and a determination of radioactivity levels in sediment samples after Chernobyl in the Eastern Black Sea, Turkey

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

“…where MDA is in Bq kg −1 , σ is the statistical coverage factor, which is equal to 1.645 (confidence level 95%), and B is the background value for a certain radionuclide [12]. The MDA for the studied radionuclides was calculated as 0.16, 0.24, 1.69 and 0.02 Bq kg -1 for 226 Ra, 232 Th, 137 Cs and 40 K, respectively.…”

“…Subsequently, all samples were transferred to the cold chain box and transported to the laboratory for the necessary analyses. [12][13].…”

“…The activity levels of 226 Ra, 232 Th, 40 K and 137 Cs in all samples were measured using a coaxial HPGe detector (Ortec, GEM55P4-95 model). Detailed explanations about the measurement system are previously presented elsewhere [12,16]. The activity values of of 40 K and 137 Cs were determined using their peaks at 1460.8 keV and 661.6 keV, respectively.…”

“…The activity values of of 40 K and 137 Cs were determined using their peaks at 1460.8 keV and 661.6 keV, respectively. In the calculation of activity, dry weight (dw) was taken into account for all samples [12,17].…”

Distribution of radionuclides in modern sediments of the rivers flowing into the Dnieper-Bug Estuary

“…Marine sediment samples were collected in 2015 from the same fifteen sampling points, and the activity concentrations of 226 137 Cs respectively. The results showed that there was a steep decline in 137 Cs within the sediment at most of the sampling sites from the Eastern Black Sea region during the 22-year period [15].…”