Radioactivity measurements were performed, at the Yalova (Turkey), part of the Marmara Sea, for natural radiation using a scintillation detector SP6 (via using portable counter ESP2, Eberline). Based on the measurement results, the lowest outdoor gamma concentration was calculated to 27.70 nGy/h while the highest one calculated to 66.00 nGy/h. And, the average of the measured gamma dose rates calculated to 48.13 nGy/h while the annual effective dose equivalent was calculated to 59.02 μSv/y. Mean value of excess lifetime cancer risk also obtained 2.07 10-4 from using measurement datas. The results checked against the world average determined by UNSCEAR. It was concluded that the calculated gamma dose values in Yalova are below the world average.
Gamma dose rates, Scintillation detector, Yalova