Look at step #61 of this excerpt of a trace. The step length is 11.1 mm for a 7 MeV electron in water !!! This yields a huge 1.73 MeV energy deposit. The cut was set to 0.5 mm. ************************************************************************* * G4Track Information: Particle = e-, Track ID = 1, Parent ID = 0 ************************************************************************* Step# X(mm) Y(mm) Z(mm) KinE(MeV) dE(MeV) StepLeng TrackLeng NextVolume ProcName (...) 57 -21.2 31.3 -110 8.82 0.00314 15.5 987 World Physical LowEnergyIoni 58 -16.1 31.6 -111 8.82 0.000735 5.18 992 World Physical LowEnergyIoni 59 1.27e-14 32.7 -113 8.82 0.00339 16.3 1.01e+03 TargetPV Transportation 60 0.183 32.7 -113 8.78 0.0324 0.184 1.01e+03 TargetPV LowEnBrem 61 11.1 31.6 -113 7.05 1.73 11.1 1.02e+03 TargetPV LowEnergyIoni 62 19.2 34.5 -113 5.59 1.46 8.88 1.03e+03 TargetPV LowEnergyIoni 63 25.9 36.7 -113 4.49 1.1 7.02 1.04e+03 TargetPV LowEnergyIoni
This was identified as a not to be a problem; the energy deposit is consistent with what one expects. As to the step length, indications were conveyed to the user as to the usage of Geant4 in microdosimetry applications. Sorry for this late reply; the problem was indeed handled with the user time ago.
