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The imager IBIS
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The imager, IBIS

January 5, 2013
Date: 25 Sep 2002 Depicts: IBIS Copyright: ESA 2002 The imager, IBIS (Imager on Board the Integral Satellite) will give sharper images than any previous gamma-ray instrument. IBIS will locate sources to within a precision of 30 arcseconds, which is the equivalent of measuring the position of individual people in a crowd situated at a distance of 1.3 kilometres. The instrument works in the energy range 15 keV to 10 MeV. It consists of a detector and a coded mask made of tungsten that is placed 3.2 metres above it. The detector uses two layers of sensitive picture elements (pixels) located one on top of the other. The top layer is made of 16 384 cadmium-telluride (Cd-Te) pixels and will detect the low-energy gamma rays. The second layer consists of 4096 caesium-iodide (Csl) pixels, and will capture the high-energy gamma rays. Comparing the results from the two layers allows the paths of the gamma rays to be tracked in 3D. The principal investigating institutions for IBIS are IAS Roma, Italy, CEA Saclay, France and TESRE Bologna, Italy.