Abstract
The determination of natural radionuclide concentrations plays an important role for assuring public health and in the estimation of the radiological hazards. This is especially true for high level radiation areas. In this study, (226)Ra, (228)Ra and (238)U concentrations were measured in well waters surrounding eight of the high-level natural radiation areas in northern Vietnam. The (226)Ra, (228)Ra and (238)U activity concentrations vary from <1.2 × 10(-3)-2.7 (0.46), <2.6 × 10(-3)-0.43 (0.07) and <38 × 10(-3)-5.32 Bq/L (0.50 of median), respectively. (226)Ra and (238)U isotopes in most areas are in equilibrium, except for the DT-Thai Nguyen area. The calculated radiological hazard indices are generally higher than WHO (World Health Organization) recommendations. Average annual effective dose and excess lifetime cancer risk values due to drinking well water range from to 130 to 540 μSv/year and 7.4 × 10(-6) to 3.1 × 10(-5), respectively.