<div dir="ltr">Hello Uwe, <div><br></div><div style>there is a problem with Gate version 6.2 due to a bug in geant4 9.5 : there is no f<span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px;white-space:nowrap">luorescence. </span><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px;white-space:nowrap">It may explain the differences. </span></div>
<div style><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px;white-space:nowrap"><br></span></div><div style><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px;white-space:nowrap">Didier dig into this and found a workaround but it needs some changes in Geant4 code (and Gate code), so it cannot by easily corrected now. The bug has been reported to G4 dev but I don't know yet if geant4 9.6 correct this. </span></div>
<div style><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px;white-space:nowrap"><br></span></div><div style><font color="#000000" face="arial, sans-serif"><span style="white-space:nowrap">We need to propose a solution for the next release (at least a short document explaining changes to be done in G4 code in order for the user to enable fluorescence). </span></font></div>
<div style><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px;white-space:nowrap"><br></span></div><div style><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px;white-space:nowrap">Sincerely, </span></div>
<div style><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px;white-space:nowrap">David</span></div><div style><span style="color:rgb(0,0,0);font-family:arial,sans-serif;font-size:13px;white-space:nowrap">PS: I put gate-users in copy, because it may be of interest to other users.</span></div>
<div style><br></div></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Mon, Mar 18, 2013 at 5:02 PM, Pietrzyk, Uwe <span dir="ltr"><<a href="mailto:u.pietrzyk@fz-juelich.de" target="_blank">u.pietrzyk@fz-juelich.de</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div style="word-wrap:break-word"><div><br></div>Dear Albertine,<div><br></div><div>in the course of preparing a new example for EduGATE I ran into</div>
<div>a subtle problem:</div><div>The example refers to Fig. 10-4, p 153 in the book "Physics in Nuclear Medicine"</div><div>from Cherry, Sorensen and Phelps, Third Edition, which is nice to explain</div><div>what happens among other things when using NaI(Tl) for gamma</div>
<div>spectrometry. I succeeded to receive a very similar plot from my</div><div>simplyfied setup as you can see in the attached files. However, the escape</div><div>peak from Iodine is only visible when I run Gate_v6.1 and it is missing</div>
<div>when I run Gate_v6.2 using the identical macros! </div><div>The Gate_v6.1 result I only got, when I replaced the model from "standard" </div><div>to PenelopeModel, otherwise, the escape peak would not be visible!</div>
<div>Using the "LivermoreModel" did not change the findings with Gate_v6.2!</div><div><br></div><div>Finally, I asked Michaela Gaens to have a quick look into this problem,</div><div>but this seems to be burried into the difference between the two</div>
<div>GEANT4 versions. This is to difficult for me, hence, I appreciate</div><div>any help. For the moment I'll continue to use 6.1, but it should also</div><div>work for 6.2.</div><div><br></div><div>Many thanks and kind regards,</div>
<div><br></div><div>Uwe</div><div><br></div><div>PS: Please note, that the example was named "Gamma_Sphere", but in this</div><div>case I replaced the sphere by a plate (1 or two plates).</div><div><br></div><div>
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<div><div style="word-wrap:break-word"><div>/----------------------------------------------------------------------</div><div>Prof. Dr. Uwe Pietrzyk<br>Diplom-Physiker<br>Institut für Neurowissenschaften und Medizin / INM-4<br>
Forschungszentrum Jülich GmbH<br>52425 Jülich<br>Tel: <a href="tel:%2B49-2461-61%204763" value="+492461614763" target="_blank">+49-2461-61 4763</a><br>Fax: <a href="tel:%2B49-2461-61%202820" value="+492461612820" target="_blank">+49-2461-61 2820</a><br>
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&<br>Bergische Universität Wuppertal<br>Fachbereich C - Physik / D.08.01<br>Gaußstr. 20<br>42097 Wuppertal<br>Tel: <a href="tel:%2B49-%280%29202-439-3523" value="+492024393523" target="_blank">+49-(0)202-439-3523</a><br>
Fax: <a href="tel:%2B49-%280%29202-439-2811" value="+492024392811" target="_blank">+49-(0)202-439-2811</a><br>eMail: <a href="mailto:Uwe.Pietrzyk@physik.uni-wuppertal.de" target="_blank">Uwe.Pietrzyk@physik.uni-wuppertal.de</a><br>
<a href="http://www.medizinphysik.uni-wuppertal.de/" target="_blank">http://www.medizinphysik.uni-wuppertal.de</a><br>----------------------------------------------------------------------/</div><div><br></div></div></div>
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