PROBLEM TO BE SOLVED: To provide a decontamination device using hydrogen peroxide solution in which aqueous solution of hydrogen peroxide smoothly flows by preventing bubbles from adhering to a strainer.SOLUTION: A first cylindrical part 52 made of a mesh-like material is arranged in such a manner that it is connected to piping 25, protrudes toward the inside of a tank 22 and extends upward. A second cylindrical part 54 having a larger diameter than that of the first cylindrical part 52 and made of a mesh-like material is arranged around the first cylindrical part 52 in such a manner that its upper end is located above the upper end of the first cylindrical part 52 and its lower end abuts on the inner bottom face 22b of the tank 22. A third cylindrical part 56 having the same diameter as that of the second cylindrical part 54 is arranged in such a manner that its upper end protrudes upward to above the liquid level of an aqueous solution of hydrogen peroxide stored in the tank 22 and its lower end is connected to the upper end of the second cylindrical part 54, wherein the third cylindrical part 56 is made of a material that prevents the aqueous solution of hydrogen peroxide from permeating it.SELECTED DRAWING: Figure 2【課題】 ストレーナに気泡が付着しないようにして、過酸化水素水溶液の流れをスムーズにできる過酸化水素除染装置を提供する。【解決手段】 メッシュ状の部材で形成された第１筒状部５２が、配管２５と接続されてタンク２２内部に突出し、タンク２２内で上方に延びるように配置され、第１筒状部５２よりも大径であり、メッシュ状の部材で形成された第２筒状部５４が、上端がタンク内で第１筒状部材５２の上端よりも上方に位置し、且つ下端がタンク２２の内底面２２ｂに当接するように、第１筒状部５２の周囲に配置され、第２筒状部５４と同径の筒状であって過酸化水素水溶液を通過しない部材で形成された第３筒状部５６が、上端がタンク２２に貯留されている過酸化水素水溶液の液面よりも上方に突出し、且つ下端が第２筒状部５４の上端に接続するように配置されている。【選択図】 図２
