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Question Problems with spectrum of multipeaks source 

Forum: Physics List
Date: 20 Jan, 2011
From: Nicolas Maurissen <Nicolas Maurissen>

Hi everyone !

I'm trying to simulate my 3'' NaI detector (using the exGPS exemple as start point) with quite good results, but as I try to improve my simulation, I'm getting stuck with the source simulation.

On the first part, if I manually simulate a 60Co source with the PGA, ie by invoking the particleGun->GeneratePrimaryVertex(anEvent) command for each peak and adding a gaussian distribution on the energies to simulate the detector's resolution, I obtain a good spectrum with all the structures (compton edges, compton region), but if I want to simulate a multipeak source which has not all its branching ratio equal to one, I'm screwed. I tried to « play » with the Weight factor (while using the PGA) and a ''if'' condition over the initial kinetic energy (obtened with the aTrack->GetVertexKineticEnergy() command), but all I achieved was to summon a « batman head » on one my spectrum (see the attached file).

On the other part, I've read that it may be easier to use an Ion source and let Geant4 do the work, instead of emmitting gammas at required energies. When I apply this method (using the physics code from the rdecay02 exemple), I can't use my energy broadening anymore, which makes my simulation obsolete (my spectrum is "too perfect" for NaI detector)!

Does anyone have any solution for either of those cases ?

Thanks a lot.

   Attachment:
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/01/20/08.26-59581-um_60Co_un-Weighted.png
      http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2011/01/20/08.26-95209-ctrum_60Co_Weighted.png

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1 None: Re: Problems with spectrum of multipeaks source   (michel maire - 22 Jan, 2011)
(_ None: Re: Problems with spectrum of multipeaks source   (Nicolas Maurissen - 24 Jan, 2011)
1 Warning: Re: Problems with spectrum of multipeaks source   (Tom Roberts - 24 Jan, 2011)
2 Idea: Re: Problems with spectrum of multipeaks source   (Laurent Desorgher - 25 Jan, 2011)
3 None: Re: Problems with spectrum of multipeaks source   (michel maire - 25 Jan, 2011)
1 None: Re: Problems with spectrum of multipeaks source   (Nicolas Maurissen - 25 Jan, 2011)
4 None: Re: Problems with spectrum of multipeaks source   (michel maire - 26 Jan, 2011)
1 Ok: Re: Problems with spectrum of multipeaks source   (Nicolas Maurissen - 27 Jan, 2011)
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