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The anticipated high sensitivity and the science goals of the next generationX-ray space missions, like the International X-ray Observatory or Simbol-X,rely on a low instrumental background, which in turn requires optimizedshielding concepts. We present Geant4 based simulation results on the IXO WideField Imager cosmic ray proton induced background in comparison with previousresults obtained for the Simbol-X LED and HED focal plane detectors. Ourresults show that an improvement in mean differential background flux comparedto actually operating X-ray observatories may be feasible with detectors basedon DEPFET technology. In addition we present preliminary results concerning thevalidation of Geant4 based radioactive decay simulation in space applicationsas a part of the Nano5 project.

Progress and Validation of Geant4 Based Radioactive Decay Simulation Using the Examples of Simbol-X and IXO