Kurzfassung
Im Ästuar des Flusses Blackwater wird eine kommerzielle Austernfischerei betrieben. In die Flußmündung werden in niedrigen Konzentrationen radioaktive Abwässer von der Bradwell Nuclear Power Station geleitet. Die Situation bezüglich der radioaktiven Verunreinigung des Flusses wird dargestellt und das Überwachungssystem des Ministry of Agriculture, Fisheries and Food beschrieben, wobei darauf hingewiesen wird, daß die Stärke der Radioaktivität auf einer kommerziell genutzten Austernbank ausreichend gut kontrolliert werden kann. Das kritische Radionuklid ist65Zn, das im Austernfleisch enthalten ist. Anhand der Werte der spezifischen Aktivität von65Zn,60Co,55Fe und137Cs von Austern, die in unmittelbarer Nähe des Abwassereinflusses lebten, wird gezeigt, daß im ungünstigsten Falle der Austernkonsument 0,2% der von der I.C.R.P. zugelassenen Menge aufnimmt.
Summary
1. The radiological situation in the Blackwater estuary is reviewed.
2. Some data are produced to contrast the behaviour of particulate and soluble nuclides in this estuarine environment and it is demonstrated that65Zn,60Co and55Fe probably reach the oysters on fine silt particles.
3. The conclusion of the pre-operational assessment is confirmed, that oysters are the critical material and65Zn is the critical radionuclide.
4. At present, oysters are the only material in which measurable concentrations of activity exist throughout the estuary.
5. The maximum dose-rates experienced by exceptional oyster consumers are less than 0.2% of the I.C.R.P. permissible Dose Limits for members of the public.
6. A system is developed to relate oyster contamination, and consequently discharge rate of radioactivity, to any distance from the power station outfall.
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Preston, A. The control of radioactive pollution in a north sea oyster fishery. Helgolander Wiss. Meeresunters 17, 269–279 (1968). https://doi.org/10.1007/BF01611229
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DOI: https://doi.org/10.1007/BF01611229