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Hi, I'm considering a 250 MeV proton beam in a detector composed of a polystyrene layer (thickness of 1 mm), a MS20 tissue layer (thickness of 6 micron) and a water layer (thickness of 1 mm). Iím using tracking/verbose 1 /testem/phys/addPhysics standard #em physics PhysicsList::AddPhysicsList: <standard> /testem/phys/addPhysics binary #hadronic physics PhysicsList::AddPhysicsList: <binary> /testem/phys/addPhysics binary_ion #hadronic physics PhysicsList::AddPhysicsList: <binary_ion> /testem/phys/addPhysics elastic #hadronic physics PhysicsList::AddPhysicsList: <elastic> PhysicsList::SetCuts:CutLength : 10 nm When I store and save the information about the number of secondary electrons with energy equal to 0 lying on the two interface planes (polystyrene- MS20) and (MS20- water), I obtain the following result: Nel(polystyrene- MS20 interface) = 20 * Nel(MS20- water interface) Why is the number of secondary electrons with energy equal to 0 on the interface (polystyrene- MS20) about 20 times greater than the number of secondary electrons with energy equal to 0 on the interface (MS20- water) ?? Please help me. Thanks a lot. Giuseppe
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