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Dynamic tool for the assessment of radiation doses to marine biota (demo version 1.15) A generic approach has been developed by WSC (funded by the Nuclear Decommissiong Authority) to simulate dynamically the uptake and turnover of a number of radionuclides by marine biota. The approach incorporates a three-compartment biokinetic model based on first order linear kinetics, with interchange rates between the organism and its surrounding environment. Model rate constants are deduced as a function of known parameters: biological half-lives of elimination, concentration factors and a sample point of the retention curve, allowing for the representation of multicomponent release. The . Radionuclides considered are ^99^Tc, I-isotopes, Cs-isotopes and ^241^Am. The new methodology has been tested and compared to non-dynamic assessment models developed for regulatory purposes. The approach has also compares well against research dynamic models developed to represent the uptake of technetium and radioiodine by lobsters and winkles. Assessments conducted on two realistic test scenarios demonstrated the importance of simulating time-dependency for ecosystems in which environmental levels of radionuclides are not in equilibrium.

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