Ionization chamber for ion beams (1) with a chamber housing (2), with a beam input window (3), with a chamber volume (5) filled with counting gas, with a high voltage anode (6) and with a high voltage cathode (7), in which the ionization chamber (8) is formed in a sandwich form from flat structures of large surfaces of the previous components, which are aligned orthogonally to the axis of the ion beam, in which a counting anode (9) large surface plane, orthogonally aligned, arranged in the center is surrounded on both sides by a high voltage flat cathode (7) large surface area, which is constituted by two parallel surfaces of cathodes (10) and the chamber housing (2) is constituted by a housing frame (11), which almost squarely frames a volume of the ionization chamber (12), characterized in that an input window of the beam (3) and an exit window of the beam (4) are placed in orthogonal alignment with respect to the ion beam (1) in a gas-tight manner and electrically conductively on the housing frame (11), in which the beam entry window (3 ) and the beam exit window (4) are metallized towards the volume of the ionization chamber (12) and in which the counting anode (9) and the high voltage cathode (7) are constituted by a fabric that It has metal-coated plastic fibers and is embedded in racks (20), which are supported, electrically insulated, on the frame of the housing (11), in which some electrically insulating distance elements (21) define the distance between the counting anode (9) and high voltage cathode (7).
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