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Forum: Event and Track Management
Re: Question problems on boundaries (giuseppe)
Date: 11 Feb, 2008
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

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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