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Question Re: trouble with optical properties meaning 

Forum: Processes Involving Optical Photons
Re: Question trouble with optical properties meaning
Re: Feedback Re: trouble with optical properties meaning (Gumplinger Peter)
Re: Question Re: trouble with optical properties meaning
Re: None Re: trouble with optical properties meaning (Vlasios Vasileiou)
Date: 07 Jun, 2012
From: <esther>

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

inactivate/rayleigh

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?

Thanks again,

Esther

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1 Feedback: Re: trouble with optical properties meaning   (Gumplinger Peter - 07 Jun, 2012)
(_ Ok: Re: trouble with optical properties meaning   (esther - 08 Jun, 2012)
(_ Question: Re: trouble with optical properties meaning   (Aram Teymurazyan - 04 Feb, 2013)
(_ None: Re: trouble with optical properties meaning   (Vlasios Vasileiou - 06 Feb, 2013)
(_ None: Re: trouble with optical properties meaning   (Aram Teymurazyan - 06 Feb, 2013)
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