[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:

      	


            30.00%

      	


            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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: Energy_Spectrum_GATE.eps
Type: application/postscript
Size: 9455 bytes
Desc: not available
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20090313/eb361e2f/attachment.eps>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: Energy_Spectrum_Geant4.eps
Type: application/postscript
Size: 13890 bytes
Desc: not available
URL: <http://lists.opengatecollaboration.org/mailman/private/gate-users/attachments/20090313/eb361e2f/attachment-0001.eps>