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Question Cut influence in Gate/Geant4 for a 230 MeV proton beam 

Forum: Medical Applications
Date: 07 Apr, 2009
From: Loc Grevillot <Loc Grevillot>

I work with Gate that is a Geant4-based platform. My Geant4 version is geant4.9.2

I irradiate a 10x10x40 cm water tank, with a 10 cm diameter circular proton beam of 230 MeV. I measure dose deposition in a stack of 2x2x0.1 cm voxels. My physics list is roughly composed of the standard EM and Binary Cascade for HAD.

I tried different cut values between 1mm and 1m to evaluate its influence on the proton range, with the defaut step size. With a 1mm cut or a 1m cut, the ranges are the same. From 1mm to 0.1mm, the range increase up to 6mm and then go back to its initial position.

1/ I can't explain this phenomenon. How cut values below 1mm can lead to a 6mm range shifting?

Furthemore, with a 0.1mm cut, the range agree with the NIST data within 2mm with a 1mm step limiter and within 1 mm with a 0.1mm step limiter.

2/ Is there any link between the cut value and the steplimiter?

3/ Any other ideas?

Thank you for your suggestions.

Loc.

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1 Idea: Re: Cut influence in Gate/Geant4 for a 230 MeV proton beam   (Vladimir Ivanchenko - 12 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 - 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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