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Abstract
The physico-chemical properties of 60Co contaminants arising from the UK Naval Nuclear Propulsion Programme (NNPP)pressurised water reactor (PWR) plants have been investigated in order to reviewindividual monitoring requirements at Devonport Royal Dockyard (DRD). This has beenachieved through laboratory tests on NNPP primary component samples andinterpretation of direct bioassay measurements using internal dosimetry modellingsoftware.Interpretation of lung measurements was completed for two inhalation events involvingmaterial originating from a PWR plant and post-primary circuit decontamination. Initialestimates of intake and dose were calculated using International Commissionon Radiological Protection default parameter values. However, a good fit couldonly be achieved by fitting the data to alternative absorption parameterswhere 90–95% of the material dissolved and absorbed rapidly at a rate of 1 day − 1.As a consequence of this review, a number of improvements have been made to monitoringarrangements at DRD. A minimum of three direct measurements are now taken during the0–30 day period after an intake, the capability of the Canberra Accuscan has beenenhanced and dissolution tests are being carried out by the Health Protection Agency(HPA) on samples taken from PWR plants.
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