Localization of CsI radioaerosols by means of different filtering elements from gaseous phase

The behavior of 137Cs131I radioaerosols, yielded by CsI evaporation from a Pt healer into argon or air, during their localization with aqueous solutions and various filtration materials [filters based on Petryanov fabric (from here on, Petryanov filter), while band paper filter, and TRUMEM metallic membrane filter] was studied. The degree of localization of 137Cs131I radioaerosols was examined in relation to the amount of sublimed 137Cs131I, the number of bubblers in the system, the size of the nozzle in the bubbling system, and the gas stream flow rate. The efficiency of localization of 137Cs131I radioaerosols with a 10-layer stack of Petryanov filters from the gas stream with and without bubbling system was estimated. It was found that, at the stream velocity of 2-3 cm s-1, a 10-layer stack of Petryanov filters with the total thickness of 3 cm takes up ca. 97% of total 137Cs131I sublimed from the Pt heater. It was shown that the bubbling system does not affect the efficiency of localization of 137Cs131I radioaerosols by Petryanov filters but only favors decrease of the aerosol load on these filters. Electron-microscopic examination of the particle-size distribution of the CsI aerosols penetrating through aqueous solutions was carried out, and various filtration materials (Petryanov filter and white band paper filter) were tested