[Gate-users] No match results

mario bachaalany mario at sbgmail.in2p3.fr
Wed Mar 11 10:39:13 CET 2009

Hi all,

I'm simulating a system with four detectors made of LYSO crystals, a 
fluorine-18 as source, and two spheres of water as a phantom using GATE 
and Geant4, and I'm not getting with GATE the same deposited energy 
histogram in the hits branch (edep) as in Geant4. In Geant4 i can see 
two obvious peaks (expected), the first at about 450 keV which simulates 
the X escape on the Lutetium K-alpha1 ray for the photoelectric effect 
and the second lower one at 511 keV. But in GATE i only have one peak on 
511 keV. I tried to change the physics but the only thing I get is a 
high peak near to 0 keV and a peak on 450 keV representing only 0.4% of 
the total hits and it happens when i put the photoelectric at low energy.

I would be very thankful about any idea that fixes this problem.

Best regards

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