[Gate-users] GATE and Geant4 comparison

[mario bachaalany]

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%                    23.3%

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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