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Forum: Physics List
Re: None photoelectric peak (cognet marie-anne)
Date: 16 Aug, 2005
From: Vladimir IVANTCHENKO <>

On Tue, 16 Aug 2005, cognet marie-anne wrote:

> *** Discussion title: Physics List
> Email replies to must include:
>   In-Reply-To: <"/phys-list/173">
>   Subject: ...change this to be about your reply.
> Hello
> I am a new user of GEANT4 and I have a problem to simulate gamma energy
> deposition.
> I try to obtain the spectrum in a scintillator YAP if there is a Cesium
> source (gamma ; 662keV) 2cm far from the YAP.
> I use the TestEM1 example for the physics list. We expect to see on the
> spectrum, the Compton front and the photoelectric peak (0.662MeV). But,
> we do not obtain energy higher than 0.1 MeV !
> I cannot find what is wrong. Can you help me please ? Are there another
> examples that can help me ? It would be really great if I can find why I
> don't have the photoelectric peak (note that we have it on the
> experimental spectrum ...)
> Thank you a lot in advance,
> Marie-Anne Cognet.


There are other EM examples (2,3,4...), however PhysicsList will not be 
different for your case. To understand, what is going on in your 
simulation, try to use visualization or try try to study verbose output

/tracking/verbose 2


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