Electron ray source generation device and method for generating low-dose-rate electron ray

The invention provides an electron ray source generation device and a method for generating a low-dose-rate electron ray. The electron ray source generation device is used for irradiating an illumination face and comprises an electro ray generator, as well as a fan, wherein the electro ray generator is used for outputting the electro ray; the electro ray is emitted from an exit face of the electro ray generator; an absorption plate and a scanning mechanism are orderly arranged on the transmission route of the electron ray; the absorption plate is used for sheltering the electron ray; a leakage hole through which a part of the electron ray is emitted in a leakage way is formed in the absorption plate; the scanning mechanism is used for scanning the electron ray which is emitted through the leakage hole in the leakage way in the air, so that the scanned electron ray can be evenly irradiated to the illumination face; and the fan is used for decreasing the temperature of the absorption plate and the scanning mech