The paper discusses a numerical model for radial transport in a toroidal plasma/gas mixture consisting of all charge states of deuterium, tritium and helium. Solutions of the steady-state momentum and particle balances indicate an enrichment of tritium gas near the reactor wall compared with deuterium. The helium enrichment ratio, although depending strongly on the ion transport model adopted, is always less than unity. Therefore, pumping helium from a cool plasma/gas blanket surrounding the entire plasma body is not attractive.