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Question Problems when using Geant4-DNA, urgent help needed 

Forum: Medical Applications
Date: 08 Jun, 2008
From: Baiyu Chen <Baiyu Chen>

Hi all,

I am a senior student who are recently working on my diploma thesis. I want to look into the application of MC methods to Microdosimetry, so i choose Geant4-DNA. However, i do have problem when using this new package. So it would be really nice if anyone in this forum has such experience and helps me. Thank you very much!

My simulation case is very simple: A 3 MeV alpha particle hits straight on the CENBG's cell phantom model along Z-axis. Since i only want to know the track of the particles, i collect the name of the particles and their positions in each step.

First, i try to use an ordinary G4physicslist, including particle definitions and EMprocess. And the outcome is OK, except for the information is limited.

Then in the second stage, i change the G4physicsList in to a G4-DNA one, including many new header files and so on. Then problems appear! It seems that all the paticles only MOVE in 2 dimensions! the y-position of alpha is always zero!

I really can't figure out why this happens. x and y axis are equally treated in my input file, so why alpha particle only move in XOZ plane? Can anybody help me? My inputfiles can be found at: http://vspace.tsinghua.edu.cn/personaldata/2004011686/Geant4-DNA/microdosimetry.rar

And i have another question. The Energy deposited in most steps is zero. Does that make sense?

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1 None: Re: Problems when using Geant4-DNA, urgent help needed   (Sebastien INCERTI - 09 Jun, 2008)
2 None: Re: Problems when using Geant4-DNA, urgent help needed   (Sebastien INCERTI - 09 Jun, 2008)
3 None: Re: Problems when using Geant4-DNA, urgent help needed   (Sebastien INCERTI - 11 Jun, 2008)
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