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Good Morning Dominique, </div>
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you should be able to have Cerenkov photons without having the scintillation class activated. </div>
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Could you please share the GATE lines you used to define the physics, and possibly the definition of
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PbWO4<span> </span></span>in your Materials.xlm? </div>
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Thanks! </div>
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Carlotta</div>
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<p style="margin-top:0px; margin-bottom:0px"><span>-- <br>
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<p style="margin-top:0px; margin-bottom:0px"><span>Carlotta Trigila, PhD <br>
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<p style="margin-top:0px; margin-bottom:0px"><span>Department of Biomedical Engineering
<span>– GBSF 2505</span><br>
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<p style="margin-top:0px; margin-bottom:0px"><span><span>University of California, Davis</span><br>
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<p style="margin-top:0px; margin-bottom:0px"><span><span>451 East Health Sciences Drive</span><br>
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<p style="margin-top:0px; margin-bottom:0px"><span>Davis, CA 95616 <br>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Gate-users <gate-users-bounces@lists.opengatecollaboration.org> on behalf of Dominique Yvon <dominique.yvon@cea.fr><br>
<b>Sent:</b> Friday, August 20, 2021 8:47 AM<br>
<b>To:</b> gate-users@lists.opengatecollaboration.org <gate-users@lists.opengatecollaboration.org><br>
<b>Subject:</b> [Gate-users] Is Cherenkov Radiation broken on recent Gate Install?</font>
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<div style="margin:0px">Good evening,</div>
<div style="margin:0px"><span class="x_Apple-tab-span" style="white-space:pre"></span>To test the generation of Cherenkov photons on Gate, I ran on my macOSX computer a test code, where I commented the scintillation process, I kept the Cherenkov process, and
I shoot 511 keV in a PbWO4 crystal.</div>
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<div style="margin:0px"><span class="x_Apple-tab-span" style="white-space:pre"></span>I attach you the output file, for such a macro, executed </div>
<div style="margin:0px"><span class="x_Apple-tab-span" style="white-space:pre"></span>- on my computer running Gate-Dev under Geant4-V10.7.p1 and </div>
<div style="margin:0px"><span class="x_Apple-tab-span" style="white-space:pre"></span>- on an unix computer running Gate_V9.0. under Geant4-V10.6</div>
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<div style="margin:0px">In both cases you will notice that even during a photoelectric conversion in the crystal, (511keV deposited) no optical photon is generated, so no Cherenkov photon. We would expect on average 20 Cherenkov optical photons</div>
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<div style="margin:0px">If on the other hand, when I restore the scintillation process, (TestScinGateDevMacOS.txt) a large number of optical photons are produced.</div>
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<div style="margin:0px">I conclude that the Cherenkov process is broken in both installs.</div>
<div style="margin:0px">What do you think?</div>
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<div style="margin:0px"><span class="x_Apple-tab-span" style="white-space:pre"></span>Best regards</div>
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<div class="x_gmail_signature"><font face="Helvetica"><span style="font-size:12px">Dr. Dominique Yvon, HDR</span></font>
<div><font face="Helvetica"><span style="font-size:12px">CEA Saclay - IRFU/DPHP, Bat 141, PC21, F-91191 Gif sur Yvette Cedex</span></font></div>
<div><font face="Helvetica"><span style="font-size:12px">BioMaps, SHFJ, 4 place du général Leclerc, 91401 Orsay France</span></font></div>
<div><font face="Helvetica"><span style="font-size:12px">Tél: 01 6908 3625</span></font></div>
<div><font face="Helvetica"><span style="font-size:12px">Email: dominique.yvon@cea.fr</span></font></div>
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