Assessment of radioactivity from groundwater samples from selected areas of Western Black Sea Region, Turkey

In this study, radon concentration measurements and chemical analyses of groundwater samples were performed in four sampling locations of Bartin Province of Western Black Sea Region, Turkey. Rn-222 analysis was carried out in groundwater samples with liquid scintillation counting system in accordance with ASTM D5072 standard. The pH, total hardness, alkalinity and dissolved oxygen parameters of the groundwater samples were also determined. The radon concentrations for the water samples ranged between <3.00 Bq/L-12.03 Bq/L. Thirty eight percentage of the samples slightly exceeded the permissible limit of 11.1 Bq/L specified by USEPA for drinking waters. The annual effective doses of groundwater samples were calculated in the range of 7.41-30.74 mu Sv/y for ingestion of water (E-w.Ig), and in the range of 7.31-30.31 mu Sv/y for inhalation of radon released from water (E-w.Ih). The total calculated annual effective doses due to ingestion and inhalation were found to be below the limit value of 100 mu Sv/y specified by the World Health Organization (WHO). The radioactivity measurement results significantly varied for three sampling points but not for one sampling point on two different measurement dates, which is attributed to the differences in geological structure. The chemical analysis results, except for total hardness in two sampling points, were within the permissible limits specified by international standards.