|Message: Re: trouble with optical properties meaning||Not Logged In (login)|
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Thank you all for your explanations.
I have some more questions now:
1) As far as it concerns Rayleigh scattering, which is the name with which I enter the Rayleigh attenuation lengths in the material properties table? I mean, for absoprtion I have something like:
myMPT->AddProperty("ABSLENGTH", PhotonEnergies, Absorption, nEntries);
What word do I have to use for Rayleigh scattering in place of "ABSLENGTH"?
2) When I enter Rayleigh scattering attenuation lengths through a material properties table, can I use Rayleigh scattering cross section or do I have to stick to Einstein-Smoluchowski approximation? (I think if I give those values directly I can use whichever formula I prefer, but I just want to make sure I'm doing things right).
3) I want to make some trials using alternatively only Rayleigh Scattering or only Mie scattering, so I need to deactivate one of them at the time.
For Mie-HG scattering I think it is enough not to enter its parameters in the material properties table: right?
But what do I have to do for Rayleigh scattering? Because the manual says: for a medium named water (which I'm currently using) and no rayleigh scattering attenuation length specified by the user, the program automatically calls the RayleighAttenuationLengthGenerator... Do I just have to write something like
in my main.cc file? If so, what is the exact syntax?
4) What happens if I decide to activate both scatterings (Rayleigh and Mie) at the same time? Does Geant4 has a cut in energy, a threshold with which to choose which one of the two processes suits best for each particular case?
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