Study of well waters from high-level natural radiation areas in northern vietnam

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,226Ra,228Ra and238U concentrations were measured in well waters surrounding eight of the high-level natural radiation areas in northern Vietnam. The226Ra,228Ra and238U 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. 226Ra and 238U 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.