Abstract
Accurate precipitation information is necessary for modelling the deposition of radionuclides following an accidental release of radioactive material to the atmosphere. The increase in resolution of numerical weather prediction models (NWP) has led to precipitation which looks more realistic but performs poorly when compared to observations using traditional grid-point statistics. Dispersion models have the ability to use precipitation information derived from radars. This study looks at the differences in estimates of air activity and deposition when precipitation information from a high resolution NWP is replaced by precipitation information from radar. Using a hypothetical release and a year's worth of meteorological data the results show that in around a third of cases there is a significant difference in the amount of deposition estimated when NWP precipitation is used compared to cases where radar precipitation is used. The results also show a small number of cases where air activity concentrations vary significantly between the runs.
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