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Abstract Nuclear aerosol behaviour is a central topic in the overall determination of source terms of accidents in nuclear power plants. One of the postulated scenarios by which this could occur is the failure of the core heat removal systems. This would cause the core to: overheat, lose coolant, melt, fall bottom of the reactor pressure vessel, melt through the vessel and be quenched in the water of the reactor cavity. This would release steam and noncondensible gases to the reactor containment building and thereby increasing the pressure, which would stress the containment. In almost all cases containment building can withstand the pressure. But if containment fails,fractios of these noncondensible and radionuclides [most of them in the form of nuclear aerosols particles] would release to the environment. The quantity of radionuclides released into the environment is called the source term, which consists of contributions from groups of radionuclides, broadly |