Determination of radon activity concentrations in some well waters near the Aksehir-Simav fault system and estimation of mean annual effective doses

Radon concentrations were measured in four-well and spring water, which is used as drinking water, in the villages and districts of Afyonkarahisar province near Aksehir-Simav fault system for 24 month period, and the annual average effective dose amounts were calculated. In addition, the relationship between the average radon concentration results of potable water wells and the distance of the wells to the fault was examined for the first time in this region. Mean radon concentrations were measured between 1.9 ± 0.3 and 11.9 ± 0.5 Bql^-1. The annual effective dose values were calculated between 11 ± 1.7 and 70.1 ± 2.8 μSvy^-1 for infants, 4.0 ± 0.6 and 25.7 ± 1.0 μSvy^-1 for children and 4.8 ± 0.7 and 30.5 ± 1.2 μSvy^-1 for adults. In addition, the effect of the distance of the wells from the fault on the mean radon concentrations was also investigated. The regression coefficient (R²) was calculated as 0.85. The average radon concentration was observed higher in the water wells close to the fault. The highest mean radon concentration was measured in well no. 4, closest to the fault and 1.07 km away. (authors)