Measurement Of Natural And ~(137)Cs Radioactivity Concentrations At Izmit Bay （Marmara Sea）, Turkey

摘要

In order to determine the radioactivity level at Izmit Bay Marmara Sea, marine sediment samples were collected from five different locations. The radioactivity concentrations of naturally occurring ~(238)U, ~(232)Th and ~(40)K isotopes and also that of an artificial isotope ~(137)Cs were measured by using gamma-ray spectroscopy. Preliminary results show that the radioactivity concentrations of ~(238)U and ~(232)Th isotopes are lower than the average worldwide values while the radioactivity concentrations of the ~(40)K are higher than the average worldwide value. A small amount of ~(137)Cs contamination, which might be caused by the Chernobyl accident, was also detected.