Annual effective dose values from 137Cs activity concentrations in soils of Manisa, Turkey
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Abstract
In this study, the activity concentrations of the fallout radionuclide Cs-137 in 150 soil samples collected from 13 districts of Manisa Province were determined using a gamma ray spectrometer with a Nal(Tl) detector. The health risks to people resulting from external exposure were evaluated by estimating the outdoor absorbed gamma dose rate and annual effective dose rate (outdoor and indoor). The activity concentration of Cs-137 varied from 3.6 +/- 2.0 to 124.1 +/- 11.0 Bq kg(-1), with an average value of 43.3 Bq kg(-1). The average values of the outdoor absorbed gamma dose rate and annual effective dose (outdoor plus indoor) were found to be 1.3 nGy h(-1), and 8.0 mu Sv y(-1), (6.38 + 1.59 mu Sv y(-1)), respectively. The results were compared with internationally recommended values.