The present invention relates to an electron beam-irradiating reaction
apparatus for irradiating a desired object to be treated, such as an
exhaust gas, with an electron beam. Conventionally, a scanning tube of an
electron beam irradiation device and a reaction device-for receiving the
electron beam are rigidly connected. Therefore, excessive stress is
applied to a connecting portion between the scanning tube and the reaction
device and not only leakage of gas from the connecting portion, but also
breakage of a metal window foil provided at an end portion of the scanning
tube are likely to occur. In the present invention, to solve such
problems, a flexible hermetic sealing member 23 is provided between a
portion around the end portion of the scanning tube 12 and a peripheral
edge 18a of an electron beam receiving window in a side wall of an
electron beam reaction device 18.
