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Forum: Medical Applications
Re: None Problem of two peaks in the bragg peak (Honghuan Liu)
Date: 08 Feb, 2013
From: michel maire <michel maire>

On Thu, 07 Feb 2013 03:08:35 GMT, Honghuan Liu wrote:
> 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.
> 

 TestEm11 with macro below.  Bragg plot in attachement.
 #
 /control/verbose 2
 /run/verbose 2
 #
 /testem/det/setNbOfAbsor  1
 /testem/det/setAbsor 1 Water  15 cm
 /testem/det/setSizeYZ 15 cm
 #
 /testem/phys/addPhysics  local	# em physics
 #
 /run/initialize
 #
 /gun/particle proton
 /gun/energy 80 MeV
 #
 /analysis/setFileName 80MeV
 /analysis/h1/set 1 150 0.  15. cm	#edep profile
 #
 /testem/event/printModulo 10000
 #
 /run/beamOn 100000
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2013/02/08/08.40-46047-Bragg.gif

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1 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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