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Forum: Physics List
Re: None range cut for very thin layers (ahmet ayan)
Date: 15 Apr, 2006
From: Vladimir IVANTCHENKO <vnivanch@mail.cern.ch>

On Fri, 14 Apr 2006, ahmet ayan wrote:

> *** Discussion title: Physics List
> Email replies to PublicHyperNews@slac.stanford.edu must include:
>   In-Reply-To: <"/phys-list/249"@geant4-hn.slac.stanford.edu>
>   Subject: ...change this to be about your reply.
> 
> Hello,
> 
> I am simulating the counting of 140keV gammas which go thru a geometry
> which consists of alternating Pb/Air layers which are very thin (0.1mm).
> A 4pi Gamma source illimunates this geometry from above, seeing the
> channels down. I am counting the gamma pass thru the channels (of
> Pb/Air) from the bottom (i.e., gammas not absorber/attenuated by the Pb
> layers).
> 
> However G4 simulation does not match the theoretical expected value.
> (20% or so higher than expected value even when the theory is adjusted
> for penetration/attenuation).
> 
> I am looking for reasons for discrepeancy. I used standard and LowEnergy
> EM physics lists with range cuts ranging from 1mm to 1micron.
> 
> Anyone has any ideas/directions as to where I should be looking to
> resolve this problem?
> 
> Thank you very much, Regards, Ahmet.
> 

Hello,

Range cut is an important parameter of simulation, however, the main
problem of your application is the attenuation: you have attenuation from
theory and from Geant4 different. Please, tell us what is the gamma
energy, what is the teoretical expectation and what is the attenuation in
G4.

VI

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1 None: Re: range cut for very thin layers   (Ahmet Ayan - 17 Apr, 2006)
(_ None: Re: range cut for very thin layers   (michel maire - 17 Apr, 2006)
(_ None: Re: range cut for very thin layers   (Ahmet Ayan - 17 Apr, 2006)
(_ None: Re: range cut for very thin layers   (michel maire - 18 Apr, 2006)
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