Abstract: The radioactive aerosol generated in decommissioning the reprocessing facilities should be treated for its high concentration. CaCO₃ powder was selected as the source to produce simulative aerosol in this study. The ultrasonic atomizing technology was applied to capture and encapsulate the aerosol. The experiment result shows that the concentration of simulative aerosol decreases with capture time; large particlesin aerosol can beeasily captured; when the capture liquid dose reduced to the certain value, the result of aerosol particle capturing and encapsulating became better evidently with the increase of dose. The experiment that carried out in a ²⁴¹Am contaminated glove-box proved the radioactive aerosol concentration could reduce from 183 Bq/m³ to 1.51 Bq/m³ after the capturing process. The radioactive concentration in the glove-box had no obvious change on the seventh day. Resuspension rate of the aerosol was 6.5% when opened the ventilation at the fourteenth day. The capture liquid had good encapsulating result for radioactive aerosol and loose contamination.

Key words: radioactive aerosol, capture, encapsulate, atomizing