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A translation of the  penelope  physics subroutines to C++, designed as an extension of the G eant 4 toolkit, is presented. The Fortran code system  penelope  performs Monte Carlo simulation of coupled electron-photon transport in arbitrary materials for a wide energy range, nominally from 50 eV up to 1 GeV. P enelope  implements the most reliable interaction models that are currently available, limited only by the required generality of the code. In addition, the transport of electrons and positrons is simulated by means of an elaborate class II scheme in which hard interactions (involving deflection angles or energy transfers larger than pre-defined cutoffs) are simulated from the associated restricted differential cross sections. After a brief description of the interaction models adopted for photons and electrons/positrons, we describe the details of the class-II algorithm used for tracking electrons and positrons. The C++ classes are adapted to the specific code structure of G eant 4. They provide a complete description of the interactions and transport mechanics of electrons/positrons and photons in arbitrary materials, which can be activated from the G4ProcessManager to produce simulation results equivalent to those from the original  penelope  programs. The combined code, named P en G4, benefits from the multi-threading capabilities and advanced geometry and statistical tools of G eant 4.

The PENELOPE Physics Models and Transport Mechanics. Implementation into Geant4