Steam is a very effective medium to motivate Ejectors when directly pumping radioactive slurries over short distances. One advantage of using steam is that it is easy to provide and adds very little additional liquid to the radioactive slurry being pumped, which can be major benefit for downstream processes. Typically discharge pressures would be >2 barg. Gas is not an effective medium for directly entraining and pumping liquids. It can only be used as the motive fluid for entraining and pumping small quantities of liquids / slurries over short distances. | 
