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Question G4DNA Carbon Ions 

Forum: DNA/Very Low Energy
Date: 28 Jul, 2017
From: Nicholas Henthorn <Nicholas Henthorn>

Hi All,

Iím using Geant4-DNA (v10.2 patch-01) to simulate the transport of Carbon-12(6+) ions across a water volume (1 g/cm3). With default cut value set to 1 nm. Energy range of the production cuts table is set between 1 eV and 10 GeV.

When calculating the primary ion LET Iíve noticed what looks to be some possibly odd behaviour. Between 1191 MeV and 1192 MeV there seems to be a discontinuity in the LET (each point is the average from 5E+5 primaries).

(Graph is attached)

Iíve set up a water box of side length 10um. As the Carbon enters the volume (first step in volume) its position and kinetic energy are recorded. When the Carbon leaves the volume (last step in volume) its position and kinetic energy are recorded. Iím calculating the LET as this change in energy divided by the straight-line length connecting the first and last step.

All secondary e- are killed through the stacking action (fKill).

Iím defining the Carbon primary through the GPS, e.g.: /gps/position 0 0 -5.1 um /gps/direction 0 0 1 /gps/particle GenericIon /gps/ion 6 12 6 /gps/energy 1100 MeV

Has anyone else seen this? Or does anyone know whatís causing this?

Any advice would be greatly appreciated. Thanks,

Nick

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2017/07/28/02.01-41674-LET.png

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1 None: Re: G4DNA Carbon Ions   (Ziad Francis - 28 Jul, 2017)
(_ None: Re: G4DNA Carbon Ions   (Nicholas Henthorn - 28 Jul, 2017)
(_ None: Re: G4DNA Carbon Ions   (Ziad Francis - 28 Jul, 2017)
(_ None: Re: G4DNA Carbon Ions   (Nicholas Henthorn - 28 Jul, 2017)
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