<div dir="ltr"><div>I am trying to build a very simple recreation of a scintillator, but I'm running into some problems. I'm starting with optical photons from inside the crystal so I don't have to worry about scintillating events, but I'm unable to get any of the photons to actually leave the crystal... even out of the ends. I've followed the instructions for optical systems pretty closely, but I'm not making any headway. I've also tried to define surfaces, but it's giving me a "command does not exist" feedback and aborts the simulation. I also made sure that my GATE_USE_OPTICAL in on the the ccmake and the cc file. I haven't restarted the computer since, so that may be the problem. But if anyone out there thinks of anything that might help, I would greatly appreciate it.<br><br></div>Many cheers,<br clear="all"><div><div><div><div><div><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><b style="font-size:12.8000001907349px">R. Kevin Wilson</b><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px">San Diego State University | <i>2017</i></div><div style="font-size:12.8000001907349px">Department of Physics | <i>M.S <span style="font-size:12.8000001907349px">Medical Physics</span></i></div><div style="font-size:12.8000001907349px">Radiation Detection Measuring & Modeling Laboratory</div><div style="font-size:12.8000001907349px"><i>PET/SPECT Modeling - Gate & GEANT4</i></div><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px"><img src="https://docs.google.com/uc?export=download&id=0B6r246QLjtCqeXF0R2VyVjFEUWM&revid=0B6r246QLjtCqWVBkRm1qTjE5L09CMDNYRmRaTnhVSG8rcVVFPQ" width="85" height="96"><br></div><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px">Clemson University | <i>2015</i></div><div style="font-size:12.8000001907349px"><span style="font-size:12.8000001907349px">College of Engineering & Science</span><br></div><div style="font-size:12.8000001907349px">Department of Physics & Astronomy | <i>B.S. Applied Physics</i> </div><div style="font-size:12.8000001907349px"><span style="font-size:12.8000001907349px">CU EBIT & Atomic Physics Laboratory </span><b style="font-size:12.8000001907349px">|</b><span style="font-size:12.8000001907349px"> </span><i style="font-size:12.8000001907349px">Intern Recipient and Student Researcher</i><br></div><div style="font-size:12.8000001907349px"><br></div><div style="font-size:12.8000001907349px"><i></i><i><img src="http://math.msstate.edu/events/reu/reu2011/images/clemson_logo.gif" width="200" height="52"><br></i></div><div style="font-size:12.8000001907349px"><a href="mailto:rkwilson@mail.sdsu.edu" target="_blank">rkwilson@mail.sdsu.edu</a></div><div style="font-size:12.8000001907349px"><div><a href="mailto:rkwilso@g.clemson.edu" target="_blank">rkwilso@g.clemson.edu</a><br></div><div>(828) 216-5310</div></div></div></div></div></div></div></div></div></div></div>
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