Early attempts to charge and collect dust particles by radiation ionization were unsuccessful because of the unavailability of suitable strength radiation sources and proper geometries. This paper describes a series of experiments using an ionization chamber precipitator which indicates that suitable charging can be obtained from a 165-Ci radioactive 60Co source. Collection efficiencies of 70% have been measured with a nonoptimum geometry. The measurements were made using high resistivity salt particles, aerosol formed, having a median diameter of 0.7μm. Theoretical considerations indicate that higher efficiencies can be obtained by changing electrode spacing in the ionization chamber precipitator.