Anomalously high237Np in intertidal sediments from the Ribble Estuary in the Irish Sea |
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Authors: | J Kuwabara M Yamamoto H Nagai K Komura K Ueno D J Assinder |
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Institution: | (1) Low Level Radioactivity Laboratory, Kanazawa University, 923-12 Tatsunokuchi, Ishikawa, (Japan);(2) School of Ocean Sciences, University College of North Wales, Menai Bridge Anglesey, LL59 5EY Gwynedd, (UK) |
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Abstract: | Depth profiles and inventories of237Np in sediment cores from the Ribble Estuary in the Irish Sea have been studied along with those of Pu isotopes,241Am and137Cs, to allow a more detailed look of anomalously high237Np content observed in this estuary previously. The comprehensive data obtained showed that the depth profiles of both237Np contents and237Np/239,240Pu activity ratios were clearly different from those of239,240Pu,241Am, and137Cs and their activity ratios. As much as 80–90% of237Np inventories (0.32–1.06 kBq/m2), found in three cores, were estimated to be derived from a source other than Sellafield, on the basis of comparison of the237Np/239,240Pu inventory ratio (0.65–1.74%) found in the Ribble Estuary cores with those (0.10–0.16%) in the Ravenglass Estuary cores. |
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