[Gate-users] How to radiate back-to-back gamma-ray ?

[塚原達也]

Hello dear Gate-Users,
 
I have installed vGate. I'm trying to simulate of PET. Then, I
have a problem concerning the gamma source. I defined set type as
back-to-back, particle gamma, energy type Mono, but it radiated
different angles, it's not linear. I am reading the user's guide but I
don't really understand what parameter I should change...
Please tell me some hints and solutions.
 
Thanks a lot.
 
Tatsuya Tsukahara
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