<div dir="ltr"><div><div><div><div>June 22<br><br></div>Dear Gate-users,<br><br></div>I am simulating optical photons in a 5cmX5cm LaBr(Ce) crystal in GATE 7.0. I have chosen a Beam type gps source of gamma ray (140 keV) 1 Bq for 1 sec which means <b>only one</b> incident gamma photon on the crystal. The 64X64 anodes on the PSPMT detect the scintillation photons generated. However, I also get a lot of trajectories passing through the system. What do these trajectories correspond to? Are these gamma rays from Compton events? But I started with just one gamma photon incident on the crystal! What does one make out of this? I am enclosing the macro files along with a jpg file showing the view I get in display. My main file to run is named "newcam.mac".<br>
<br></div>Any interpretation will be appreciated.<br><br></div>deba999 <br clear="all"><div><div><div><div><div><br>-- <br><i><b>Dr Debendranath Sahoo</b></i><br>Honorary Professor<br>Physics Department<br>Sri Sathya Sai Institute of Higher Learning<br>
Prashanthi Nilayam<br>Puttaparthy<br>A.P. 515 134<br>e-mail: <a href="mailto:deba999@gmail.com" target="_blank">deba999@gmail.com</a><br>Mobile: <b>094945-43026</b><br><br>
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