Abstract
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The Geant4 Simulation Toolkit provides an ample set of complementary and alternative physics models for both electromagnetic and hadronic processes, describing the interaction of particles with matter. We present a short overview of the actual state of the physics models provided by Geant4 and the results of a series of detailed tests for the quantitative validation of the electromagnetic processes. The Geant4-based test results are compared to protocol references commonly adopted in the medical physics domain (NIST and ICRU). © 2004 IEEE.