Abstract: The radioactive aerosol and loose contamination generated in disassembling the contaminated equipment by plasma cutting was harmful to the operator’s health. The method of atomizing capture liquid was used to capture and encapsulate the radioactive aerosol. The result of the engineering test indicated that reducing the capture liquid’s surface tension can decrease the atomized droplet’s particle diameter. That benefits the aerosol particle capturing. The higher viscosity contributes to encapsulate the loose contamination. On the decommissioning site, the selected capturing liquid in engineering test was effective in capturing the high concentration αradioactive aerosol and encapsulating the loose contamination. The encapsulating effort could prevent the loose contamination from resuspension for several days.

Key words: decommission, plasma cutting, radioactive aerosol, atomizing