Once a serious event occurs, plenty of gas should be discharged into environment, so it is in urgent need to filter radioactive material before the ventalition. Bubble columns which belong to a kind of wet filters have a potent ability of filtering methyl iodide. The efficency of filtration depends on interface area between liquid and gas, liquid mass transfer rate and retention time of bubbles. Furthermore the decontamination factor of methyl iodide increases with temperature, pressure and liquid level, but decreases with superficial velocity. The experimental condition in this paper is: maximum pressure 0.5 MPa and maximum temperature 150°C, superficial speed 0.2m/s, gas composed of air and steam, liquid level 0.1–2m. The relationship between DF and experiment condition is deep discussed.

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