[Gate-users] GATE and Geant4 comparison

[Seb]

Hi Mario,

Your peak around 440 keV with your G4 simulation is quite strange. Are 
you confident in your Geant4 Analysis Class ? (concerning the 
"getEnergyDeposit" methods with are used in the stepping or event user 
classes)

Cheers
Sebastien
>
>      Hi all,
>
>
>
>      I'm comparing the results obtained with GATE (4.0.0) and Geant4
>      (4.9.1.p01) for the interaction of gamma rays (511 keV) with a
>      LYSO crystals. In a previous email, I already mentioned that there
>      is some differences concerning the photoelectric fraction.
>
>
>      The numbers below are the results of a LYSO crystal already
>      defined in the GATE list of materials.
>
>
>
>         
>
>
>            Geant4
>
>         
>
>
>            GATE
>
>
>            Number of generated gammas :
>
>         
>
>
>            50000
>
>         
>
>
>            49805
>
>
>            Number of detected singles:
>
>         
>
>
>            4511
>
>         
>
>
>            3713
>
>
>            Photoelectric fraction:
>
>         
>
>
>            30.00%
>
>         
>
>
>            23.30%
>
>
>      I attached the two different spectra obtained with GATE and Geant4.
>
>
>      If anyone has the same problem or can be explain this difference,
>      please help.
>
>
>
>      Thanks in advance.
>
>
>      Mario
>
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