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Idea Re: Cut influence in Gate/Geant4 for a 230 MeV proton beam 

Forum: Medical Applications
Re: Question Cut influence in Gate/Geant4 for a 230 MeV proton beam (Loc Grevillot)
Date: 12 Apr, 2009
From: Vladimir Ivanchenko <Vladimir Ivanchenko>

Hello,

With the recent G4 releases we do not know about reported problem. In contrary, our tests show stability of range and Bragg peak position versus cut value.

Can you, please, try out Geant4 9.2 using example TestEm7 - without any change in the code you can define similar target and Physics List and changing the cut value see the result on range.

Cut and step limit are not independent - if cut is small automatically steps are small and step limit may not affect the simulation. If cuts are high step limit defines the step size.

Please, also check that your estimate range correctly when the Binary cascade is active. In that case the average value of proton track length is not a good parameter due to hadronic interactions, one can only use the Bragg peak position.

VI

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1 None: Re: Cut influence in Gate/Geant4 for a 230 MeV proton beam   (Loc Grevillot - 14 Apr, 2009)
(_ Idea: Re: Cut influence in Gate/Geant4 for a 230 MeV proton beam   (Vladimir Ivanchenko - 14 Apr, 2009)
(_ None: Re: Cut influence in Gate/Geant4 for a 230 MeV proton beam   (Loc Grevillot - 14 Apr, 2009)
(_ Idea: Re: Cut influence in Gate/Geant4 for a 230 MeV proton beam   (Vladimir Ivanchenko - 14 Apr, 2009)
(_ None: Re: Cut influence in Gate/Geant4 for a 230 MeV proton beam   (Loc Grevillot - 15 Apr, 2009)
(_ None: Re: Cut influence in Gate/Geant4 for a 230 MeV proton beam   (Loc Grevillot - 15 Apr, 2009)
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