MULTIGRID HIGH PRESSURE GASEOUS PROPORTIONAL SCINTILLATION COUNTER FOR DETECTING IONIZING RADIATION

摘要

The present invention deals with a Multigrid High Pressure Gas Proportional Scintillation Counter for the detection of ionizing radiation such as X-rays, gamma-rays, electrons or other charged leptons, alpha-particles or other charged particles as well as neutrons, which gives information about the energy dissipated in the gas and the time of occurrence of the detection, through an electronic pulse with an amplitude approximately proportional to that energy. It is essentially characterized by:having external metallic walls (1) at ground potential,being filled at a pressure in the 1-100 atmosphere range with a pure noble gas and/or continuously purified, or in mixtures,having: a reflective CsI photocathode (7); four metallic grids: G1 (2), G2 (3), G3 (4) and G4 (5) made of thin wire and with high optical transmission, superior to 70%, defining five regions delimited by these grids (2, 3, 4, 5), by the entrance radiation window (6) and by the photocathode (7),having the high voltages of the several grids applied through feedthroughs (9), producing appropriate electric fields in the several regions of the detector, that do not vary with the time.