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Question Large backscattering coefficient! 

Forum: Event and Track Management
Date: 04 Nov, 2014
From: A. Hod <A. Hod>

Dear Geant4 users,

I am facing a problem with the calculation of the electron backscattering coefficient. I calculated the backscattering coefficient of electrons in the following way and the values which I obtained are large:

Backscattering coefficient: n= number of scattered primary electrons/number of incident electrons.

I defined two volumes: Space (contains vacuum) and Box_1 (contains Silicon). Incidents electrons enter first Space and after that they enter the Box_1

In my I have:

if ((aStep->GetTrack()->GetTrackID()==1) 
        &&(aStep->GetPreStepPoint()->GetPhysicalVolume()->GetName() == "PhyBox_1")
        && (aStep->GetPostStepPoint()->GetPhysicalVolume()->GetName() == "PhySpace")

        if((aStep->GetTrack()->GetDynamicParticle()->GetDefinition() ->GetParticleName() == "e-"))
G4cout << "These is the Number of BSC e: " <<counter << G4endl;

Additional information:

Physics model: low energy EM physics (Livermore model)

Layers: 1mm x 1mm x 0.2 mm

Cut= 1 um

Energy of normally incident electrons: Ee=300 keV

I obtained the following results: Carbon (Z=6): n= 10.81%

Aluminium(Z=13): n=19.09%

Silicon(Z=14): n=21.30%

Gadolinium (Z=64): n=46.02%

Gold (Z=79)= n=49.11%

These values are actually large! I do not know why?

Is the above part of my correct? I kindly welcome your help.

With kind regards


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