[Gate-users] sensitive phantom

[Sepideh White]

ِDear Gate usersi have simulated one CylindricalPET system and I try  to measure positron range in my phantom that is in center of CylindricalPET , for this:- should phantom  attach to CrystalSD? - if answer of my last  question is yes, How can i do it in Gate?
Thanks
sepideh barati 
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