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Spatial resolution of the Medipix2 X-ray imaging detector system

Davidson, D.W. and Tlustos, L and Mathieson, K and O'Shea, V and Smith, K.M. and Rahman, M (2004) Spatial resolution of the Medipix2 X-ray imaging detector system. In: 2003 IEEE Nuclear Science Symposium Conference Record. IEEE NUCLEAR SCIENCE SYMPOSIUM - CONFERENCE RECORD, 3 . IEEE, pp. 2727-2729. ISBN 0-7803-8257-9

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Abstract

The charge sharing present in a 55 micrometer square pixel matrix of 300 micrometer thick silicon is examined. This is achieved using a commercial simulation package to investigate the diffusion effects on the charge cloud of created electrons and holes. The total fraction of charge shared is found to be 20.8%, but this can be reduced by the addition of a minimum threshold level of detection. The optimum level giving all of the signal but with the minimum of noise is found to leave 10.4% charge shared on average.