Sweden [Country report]

A major part of the work was focused on collecting data on geophysics as well as geochemistry and groundwater chemistry; mainly uranium (U), thorium (Th) and potassium (K). Data were interpreted resulting in maps and statistical description. The concentrations for the elements U, Th and K have median values that are presented. The data on concentrations in groundwater are in general somewhat uncertain for U. The amount of data on Th in groundwater was very limited thereby the estimate is even more uncertain. However the few analyses made indicates very low concentrations in groundwater. Fluxes have been roughly estimated by multiplying data on concentrations with data on runoff. Flux of potassium is estimated to range between 100-400 kg/km2/year, while a very rough estimate of U flux range between 0.5-2 kg/km2/year. No relevant data on flux of Th have been found. This is partly due to problems to estimate the weathering of Th. The Uranium archive contains data on about 2000 objects and eight of these have been selected to show natural extreme values. (author)