Estimates of activity concentrations of 40K, 238U and 232Th series radionuclides in environmental media (soil, stream sediments and stream waters) were derived from total K, U and Th concentrations derived mainly from the ongoing geochemical survey of the United Kingdom (G-BASE), conducted by the British Geological Survey. The geochemical survey data are currently incomplete for England and Wales, but almost complete coverage was obtained for K in stream sediments by using the Wolfson Atlas data for southern England. A view service is available from the CEH INformation Gateway by searching for 'England & Wales natural radionuclide concentrations in soil, water & sediments survey maps'
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