[en] Since the charge state of an aerosol may influence both the amount deposited (total dose) and its deposition site during an inhalation exposure, and the site of deposition, in turn, will influence the patterns of retention and associated radiation dose, a study has been made of the aerosol charge distribution on laboratory-produced ²³⁸Pu0₂ aerosols in an animal exposure chamber and a plutonium mixed-oxide aerosol sampled inside a safety enclosure at an industrial reactor fuel fabrication facility. Results are presented and discussed. (U.K.)