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On Mon, 11 Feb 2008, giuseppe wrote: > *** Discussion title: Event and Track Management > Email replies to PublicHyperNews@slac.stanford.edu must include: > In-Reply-To: <"/eventtrackmanage/751"@geant4-hn.slac.stanford.edu> > Subject: ...change this to be about your reply. > > 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 > Hello, If one counts number of electrons stopped in certain volume the number can be discussed and may have some phsyics meaning. The number of electrons stopped at interface (on geometry boundary ?) shows the size of the artifact for given simulation. If this number is not negligible likely results are biased. VI
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