Patent ID: 7639783
Filing Date: 2009-12-29
Classification: G01N,G01T

Abstract:
1. A detector for ionizing radiation, the detector comprising: a housing having a cathode fabricated in a spherical polygonal shape with a radius from a material substantially transparent to the radiation and containing a working gas; a grid in a shape of a spherical polygon concentric with the cathode with a radius larger than the cathode radius and located within the housing; a resistive anode in a shape of a spherical polygon concentric with the cathode with a radius larger than the grid radius, located within the housing and mounted on a first side of an insulating substrate having a shape of a spherical polygon; a readout apparatus mounted on a second side of the insulating substrate opposite to the first side; and a voltage source for applying a first electric potential between the cathode and the grid and for applying a second electric potential between the grid and the anode, the second electric potential having sufficient amplitude to generate avalanche electrons that impinge on the anode to form charged areas.