A prototype framework for representing uncertainties in radiological model parameters is introduced. This follows an earlier development (Funtowicz et. al. ibid., P.257, 1989) of a corresponding framework for representing uncertainties in radiological data. Refinements and extensions to the earlier framework are needed in order to take account of the additional contextual factors consequent on using data entries to quantify model parameters. The parameter coding can in turn feed in to methods for evaluating uncertainties in calculated model outputs.