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None Problem of two peaks in the bragg peak 

Forum: Medical Applications
Date: 06 Feb, 2013
From: Honghuan Liu <Honghuan Liu>

Dear all,

I am trying to use hadrontherapy example in GEANT4 to figure out bragg peak under different proton energy. I got very a strange result. There are two peaks in some of bragg peaks. Please see the attachment

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/02/06/18.56-15400-proton.png

You can see, there are small peaks before bragg peak for the energy from 70MeV to 160MeV. And the peak positions are shifting as energy decrease. The small peaks disappear after energy smaller than 70MeV.

I my program, I just changed the size of phantom, the particle energy and cut range based on the hadron_therapy.mac. The number of particles used is 5000. Does anyone know how the double peaks appear. How can I remove the double peaks? Thank you very much for any help.

Cheers,

Honghuan

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1 None: Re: Problem of two peaks in the bragg peak   (michel maire - 08 Feb, 2013)
(_ None: Re: Problem of two peaks in the bragg peak   (Honghuan Liu - 10 Feb, 2013)
(_ None: Re: Problem of two peaks in the bragg peak   (Francesco Romano - 03 Mar, 2013)
(_ None: Re: Problem of two peaks in the bragg peak   (Honghuan Liu - 04 Mar, 2013)
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