Patent ID: 6404114
Filing Date: 2002-06-11
Classification: H01J

Abstract:
An imaging system module comprising: a pair of high density avalanche chamber converters, each converter including a series of alternate layers of conducting and non-conducting material and an array of parallel, through-going apertures extending through said series of alternate layers, a first converter of the pair having a plurality of conducting elements extending generally parallel to each other in a first direction to form a first cathode on or adjacent to a face of the first converter and the second converter of the pair having a plurality of conducting elements extending generally parallel to each other in a direction generally orthogonal to the first direction to form a second cathode on or adjacent to a face of the second converter, and an anode formed by a series of generally parallel conducting elements positioned between the first and second cathodes, the arrangement being such that radiation incident upon either converter produces an avalanche of charged particles which are attracted towards the said anode and the incidence of a charged particle on the anode causes a current pulse in both the first and second cathodes.