a flood beam electron gun is provided for use in remediation of hazardous volatile organic compounds contained within a detoxification vessel . the flood beam electron gun comprises an electron emitter having a rounded emitting surface providing a conical electron beam . a control grid is spaced from and disposed substantially parallel to the emitting surface . the control grid has a plurality of holes disposed in a first pattern providing an array of individual electron beams from the conical electron beam of the emitter . an intermediate electrode is spaced from the emitter and the control grid , and has an aperture therethrough providing a substantially parallel flow of the array of individual electron beams . a target grid is spaced from the intermediate electrode and opposite from the cathode and control grid . the target grid has a plurality of holes disposed in a second pattern that is proportional to and substantially larger than the first pattern . each of the individual electron beams pass through respective ones of the plurality of holes in registration thereof . a vacuum barrier is provided on a downstream side of the target grid to separate the electron gun from the vessel . the individual electron beams pass through the vacuum barrier into the vessel . within the vessel , the electrons of the individual beams impact the vocs , converting the vocs to less hazardous organic compounds .