Photon detector array

摘要

The detector has a second, lower layer detecting the higher energy photons which pass through the upper layer. The matrix (8) of photon detectors comprises a planar array with a semiconductor material converting the photons into electric charges. Electrodes capture these charges for transfer to an electronic measurement system. The detectors are formed in two layers (9,10) with the electrodes (14,18) situated underneath the respective layers. Photons of a first energy are detected at the first layer, and photons of a second energy level are detected at the second layer. The detectors may be formed from materials including tellurium and cadmium. Processing of the charges collected by the electrodes is achieved by an ASIC electronic processing circuit.