Patent ID: 6518578
Filing Date: 2003-02-11
Classification: G01T,G21K,H01J

Abstract:
A high position resolution detector for detection of X-rays, comprising:a first and a second electrode arranged spaced apart, the space between which being filled with an ionizable gas; an electron avalanche amplification electrode arranged between said first and second electrodes or on a level with said second electrode; a radiation entrance window oriented such that said X-rays can enter said space between said first electrode and said electron avalanche amplification electrode for ionizing the ionizable gas; a power supplying unit for creating an electric field in said space between said first electrode and said electron avalanche amplification electrode for drift of electrons and ions created as a result of said ionization, and an electric field in said space between said electron avalanche amplification electrode and said second electrode for avalanche amplification of said drifted electrons; a readout arrangement for detection of said avalanche amplified electrons, wherein the space between said first electrode and said electron avalanche amplification electrode defines one single homogenous gas volume; and the distance between said first electrode and said electron avalanche amplification electrode is smaller than or equal to a few times the length of electron tracks of short-range electrons released in said space between said first electrode and said electron avalanche amplification electrode subsequent to said ionization.