|Message: Re: Problem of two peaks in the bragg peak||Not Logged In (login)|
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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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