Abstract
The local variations of fission product activites (144Ce, 106Ru, 137Cs and 134Cs) in surface sediments from a location in the Ravenglass estuary, north-west England, have been studied. The sediments are contaminated by the radioactive effluents discharged to the eastern Irish Sea by the Windscale nuclear fuel reprocessing facility. The results indicate that significant activity variations occur for surface samples taken from small-scale sedimentary features of the estuarine environment, and that sediment grain-size characteristics and radioactive decay exert controls on fission product distributions. The assessment of radiation exposure of the public by external gamma doses from contaminated sediments should take intt account the, variability of radionuclide distributions over small-scale features as well as the broader surveying of estuarine areas.
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