|Message: Re: Dose increases by 30% switching from G4.9.3.p02 to G4.9.4.p01||Not Logged In (login)|
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On Thu, 17 Mar 2011 15:16:56 GMT, Daniel Matthi� wrote:
> Dear all, > I observed that in simulating radiation treatment with C12, the dose in > the designated tumor region increases by about 30% if I change from > GEANT4.9.3.p02 to G4.9.4.p01 without changing anything in the physics > list and geometry. > I am using the physics lists QGSP_BERT_HP, G4IonBinaryCascadePhysics and > G4EmStandardPhysics_option3 and I noticed that the implementation of > G4EmStandardPhysics_option3 changed between the two G4 versions. For > example, the G4UrbanMscModel93() is not added to the multiple scattering > process anymore in G4.9.4.p01 and Rayleigh scattering is removed as > well. May this be the reason for the discrepancies? What should be used? > Any help is appreciated. > Daniel >
- UrbanMscModel is now the model by default. No need to specify it. - Rayleigh would not be important in this simulation. It should not be the reason of the discrepancy.
Can your simulation be more on less approached with TestEm7 ? we would try to reproduce what you see. - beam energy - matter of phantom - matter, dimensions, position of tally
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