Study of Rn-222 concentrations in drinking water in the north-eastern hydroregions of Poland

This paper presents the results of radon concentration measurements in the drinking water from the municipal water supply system and private wells loc ated in the north-eastern part of Poland. The measurements were carried out on 643 samples using a liquid scintillation method. The mean value was fou nd to be 5262 Bq m(-3) with a maximum of 38347 Bq m(-3) The samples were ob tained from different water-bearing levels, i.e. surface water, deep boreho le water and well water and have respective mean values of 3398, 5178 and 6 155 Bq m(-3) In 57 water samples, a guideline maximum level of 11 000 Bq m( -3) was found to be exceeded. The observed radon concentration in water can contribute to a 2% increase in indoor radon concentration. (C) 2001 Elsevi er Science Ltd All rights reserved.