[en] A process is described for reducing the volume of a low-level radioactive liquid waste containing a compound of an element selected from the group consisting of I, Cs, Co and Mn. The process consists of: introducing the low-level radioactive liquid waste in the form of a finely atomized spray into a spray drying zone and contacting it with a hot gas stream within the zone, the gas stream having a temperature in the range of about 45⁰ to 300⁰ C. sufficient to vaporize the water contained in the low-level radioactive liquid waste but insufficient to produce any oxidation products of the low-level radioactive liquid waste or to volatilize any radionuclides therefrom; and removing from the zone a dry, flowable solid radioactive product containing the compound of the element and a gaseous product comprising water vapor, the gaseous product containing substantially no NO/sub x/, SO/sub x/, or oxidation products of the liquid radioactive waste and no volatile compounds of I or Cs, the ratio of the volume of the low-level radioactive liquid to the dry, flowable solid radioactive product being in the range of about 2:1 to 3.5:1