Browsing by Author "Aslani, Mahmut A. A."

Now showing 1 - 2 of 2

Determination and Evaluation of Natural Radioactivity and Heavy Metal Levels in the Aquatic Environment of Trans-Boundary Rivers: Maritza, Tundja and Arda
(Springer, 2014) Aytas, Sule; Erenturk, Sema; Aslani, Mahmut A. A.; Yusan, Sabriye; Turkozu, D. Alkim; Gok, Cem; Oguz, K. Firat
The main problem in the trans-boundary river system is that heavy metal and radioactive pollution can cause long-term effects on ecosystems. Therefore the natural radioactivity and heavy metal levels in the Maritza, Tundja and Arda Rivers, common for Bulgaria and Turkey, were determined for 3 years period (2007-2010). Gross alpha, gross beta and total radium isotopes activities, uranium and heavy metal concentrations of the surface water of the rivers were investigated and also terrestrial gamma and gamma dose rate were measured. The results were compared with reported data from other countries of the world and the recommended international standards. The results gathered in this study may provide background data on the natural radioactive and heavy metal levels of these trans-boundary rivers.
Spatial Distribution and Risk Assessment of Radioactivity and Heavy Metal Levels of Sediment, Surface Water and Fish Samples From Lake Van, Turkey
(Springer, 2014) Erenturk, Sema; Yusan, Sabriye; Turkozu, D. Alkim; Camtakan, Zeyneb; Olgen, M. Kirami; Aslani, Mahmut A. A.; Isik, M. Akif
In this study, radioactivity levels of 228 lake water samples, 63 upper and depth sediment samples and 12 fish samples from Lake Van were investigated from 2005 to 2008 and the distribution patterns of the radionuclides were presented. Analysis included gross alpha-beta and total radium isotopes activities and uranium concentrations of the water, and gross alpha and gross beta activities and relevant U-238, Th-232 and K-40 activity of the sediment and fish samples of the lake. Mean gross alpha, gross beta and radium isotopes activities of lake water were found 0.74 +/- A 0.46, 0.02 +/- A 0.01 and 0.06 +/- A 0.04 Bq/L, respectively. Mean gross alpha and beta activities in upper and depth sediments were found to be 41 +/- A 6 and 1,514 +/- A 74 Bq/kg; 77 +/- A 5 and 394 +/- A 24 Bq/kg at a 95 % confidence level, respectively. Mean activities of U-238, Th-232 and K-40 activity concentrations in upper and depth sediments were determined to be 225 +/- A 22, 70 +/- A 7 and 486 +/- A 39 Bq/kg; 174 +/- A 4, 63 +/- A 3 and 263 +/- A 25 Bq/kg, respectively. The mean gross alpha and beta, U-238, Th-232 and K-40 aktivities in fish samples were established as 47 +/- A 18, 470 +/- A 12, 0.57 +/- A 0.220, 0.022 +/- A 0.006, 319 +/- A 11 Bq/kg, respectively. The transfer factor from lake water to fish tissues, annual intake by humans consuming fish, and annual committed effective doses were estimated and evaluated.