It does not require large-scale equipment such as large-diameter ducts or condensation-preventing heaters, and it is possible to connect long distance pipes to each decontamination target room and to accurately measure each room. A decontamination system capable of supplying a decontamination gas is provided. A compressed air generation means and a decontamination liquid supply means, and each of the chambers to be decontaminated comprises a gas mixture liquid regulator and a gas generator, respectively, and a gas mixture liquid regulator and a gas generator； The conveyance distance of the gas-liquid supply pipe that communicates with the decontamination liquid supply pipe is longer than the conveyance distance of the decontamination liquid supply pipe that communicates the decontamination liquid supply means and the gas-liquid mixture regulator.大口径のダクトや凝縮防止のヒーターなどの大掛かりな設備を必要とせず、複数の除染対象室に対しても各室ごとに長い距離の配管が可能で、且つ、各室ごとに正確な量の除染用ガスを供給することのできる除染システムを提供する。 圧縮空気発生手段と除染液供給手段とを有し、各除染対象室に対して、それぞれ、混合気液調整器とガス発生器とを具備して、混合気液調整器とガス発生器とを連通する混合気液供給配管の搬送距離は、除染液供給手段と混合気液調整器とを連通する除染液供給配管の搬送距離よりも長いことを特徴とする。
