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Several models of the high energy electron radiation environment in the Jovian system have been constructed, based on a limited set of data, principally from Voyager 1 and 2 and Galileo. The design of future missions to this harsh radiation environment requires characterisation of the environment and its uncertainties. From the uncertainties a margin policy can be established to ensure robustness in design without costly over engineering. The uncertainties in the Jovian radiation environment data, and subsequently the models and underlying data are presented with an approach to defining a margin policy for the Ganymede orbit.