[Gate-users] PET Simulation Warning

[Ashok Tiwari]

 Hi Xinjie, 
 I also faced this problem last week when I was simulating a voxelized phantom using the voxelized source for a dosimetry simulation. But I found that this is due to the source definition; I was using the beta spectrum simulation, but when I change the source file format using the histogram and discrete spectrum type, it was gone. 
Best, Ashok
    On Monday, 12 April 2021, 04:01:36 pm GMT-5, Xinjie Cao <xinjie.cao at stonybrook.edu> wrote:  
 
 Dear all,
I got a warning from my voxelized phantom simulation log as follows,-------- WWWW ------- G4Exception-START -------- WWWW -------
*** G4Exception : GeomNav1002
      issued by : G4Navigator::ComputeStep()
Track stuck or not moving.
          Track stuck, not moving for 10 steps
          in volume -hof_brain_physVol- at point (94.23974773575026,-188.800064708837,299.9999999999999) (local point (-0.2602522642497433,-0.3000647088369703,0.4999999999998863))
          direction: (-0.3752814347046034,-0.3143147678848536,0.871992013412706) (local direction: (-0.3752814347046034,-0.3143147678848536,0.871992013412706)).
          Potential geometry or navigation problem !
          Trying pushing it of 1e-07 mm ...Potential overlap in geometry!

*** This is just a warning message. ***
-------- WWWW -------- G4Exception-END --------- WWWW -------

And it looks like the root output data were very small whenever I got this warning, I have no idea whether there is any correlation between the warning and the small output, and I am curious whether this warning is a severe problem or neglectable.
Any answer will be highly appreciated!
Thanks,Xinjie_______________________________________________
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