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Question unreasonable position output in photon simulation 

Forum: Event and Track Management
Date: 02 Oct, 2016
From: Xiaosong Yan <Xiaosong Yan>

Hello all:
   I did some simulation about photons with energy of E0. The position of the photon is (0,0,5) cm, and the incident direction of the photons is (0,0,1) and is defined with gps method. A sensitive detector is assigned to a detector of which the center is (0,0,0)cm. I output the first interaction position in the detector and the output is also filtered with an Energy of E0 in the presteppoint. I selected the G4EmLivermorePhysics model in the simulation
   I checked the output data, over 99% of the output positions are (0,0,z)cm, however, there are also some output positions ((x,y,z)cm )of which x!=0 or y!=0. I just can't understand why there are some interaction positions not on the incident direction. 
   Thank you all.

                                   Xiaosong YAN

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