Activity concentration of 40K in drinking water in Slovenia

Activity concentrations of ⁴⁰K and ³H in drinking water from four sources in the vicinity of NPP Kr?ko and their correlation with geological data are presented. The data extends from the year 1996 until present. In addition, activity concentrations of ⁴⁰K in drinking water at randomly selected sources in Slovenia are presented on a map. These activity concentrations vary by more than an order of magnitude with the largest values in northeastern part of the country.