An assessment of the natural radiation dose to wildlife in England and Wales was made\ud to determine the contribution it may make to the total radiation dose estimated during environmental\ud impact assessments. Significant use was made of systematic datasets for environmental media (stream\ud sediments, stream waters and soils), in particular those produced by the Geochemical Baseline Survey\ud of the Environment (G-BASE) project. This provided extensive, although variable, coverage for different\ud elements and sample types after normalisation of data to account for changes in sampling and analysis over\ud time. Almost complete coverage for K in stream sediments was achieved by merging G-BASE andWolfson\ud Atlas data. This required normalisation of theWolfson data to the G-BASE results. Coverage was improved\ud greatly for U and Th in sediments, and K, U and Th in soils, by using the strong relationship between soils\ud and sediments and geology (both solid and superficial) to extrapolate the data. The total U, Th and K data\ud were used to derive activity concentrations of 238U and 232Th series radionuclides and 40K. External dose\ud rates to wildlife were then estimated from derived media concentrations; internal dose rates were estimated\ud from measured activities in biota or activities predicted using recommended concentration ratios
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