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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#200498">Hi James,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#200498"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#200498">I’m not the expert on that, but as an intuitive suggestion, since the two codes give the same results, it seems that there is a mismatch between the simulated and the experimental
X-ray spectra. Did you check your X-ray spectrum against the experimental one?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#200498"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#200498">…<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#200498"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#200498">Mahdjoub Hamdi<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#200498">Wustl, MO, USA<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif;color:#200498"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Gate-users <gate-users-bounces@lists.opengatecollaboration.org>
<b>On Behalf Of </b>MURPHY, James (ROYAL CORNWALL HOSPITALS NHS TRUST)<br>
<b>Sent:</b> Thursday, September 05, 2019 10:03 AM<br>
<b>To:</b> gate-users@lists.opengatecollaboration.org<br>
<b>Subject:</b> [Gate-users] Percent depth dose anomaly<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="color:#1F497D">Hi<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="color:#1F497D">I have found something strange and hope you may be able to help. I have a phase space for a position below the linac head and I have used this as the source for a phantom dose measurement in PRIMO
(PENELOPE variant) to get a depth dose which matches our water tank data. But when I use this in Gate (simple geometry, 1m air and 40 cm water) I get a much larger depth dose, dmax is the same though. I even get the same results using penEasy (another PENELOPE
variant).I would be very grateful for any ideas.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB"><img width="624" height="368" style="width:6.5in;height:3.8333in" id="_x0000_i1025" src="cid:image001.png@01D563E1.10F523B0" alt="cid:image004.png@01D563CE.94066EC0"></span><span lang="EN-GB" style="color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="color:#1F497D">Regards.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-GB" style="mso-fareast-language:EN-GB">James Murphy<o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">Trainee Medical Physicist<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">Radiotherapy Physics<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">Sunrise Centre<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">Royal Cornwall Hospitals Trust<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">Truro<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">Cornwall
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB">TR1 3LJ<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:8.0pt;font-family:"Wingdings 2";mso-fareast-language:EN-GB">'</span><span lang="EN-GB" style="mso-fareast-language:EN-GB"> 01872 25 8321/8320<o:p></o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-GB" style="mso-fareast-language:EN-GB"> Ext 8321/8320<o:p></o:p></span></b></p>
<p class="MsoNormal"><b><span lang="EN-GB" style="font-size:8.0pt;font-family:Wingdings;mso-fareast-language:EN-GB">*</span></b><b><span lang="EN-GB" style="font-size:8.0pt;mso-fareast-language:EN-GB">
</span></b><b><u><span lang="EN-GB" style="mso-fareast-language:EN-GB"><a href="mailto:james.murphy18@nhs.net">james.murphy18@nhs.net</a></span></u></b><u><span lang="EN-GB" style="font-family:"Arial",sans-serif;mso-fareast-language:EN-GB"><o:p></o:p></span></u></p>
<p class="MsoNormal"><span lang="EN-GB" style="font-size:10.0pt;mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-GB"><img border="0" width="232" height="52" style="width:2.4166in;height:.5416in" id="Picture_x0020_2" src="cid:image002.jpg@01D563E1.10F523B0"></span><b><span lang="EN-GB" style="font-size:10.0pt;mso-fareast-language:EN-GB"><o:p></o:p></span></b></p>
<p class="MsoNormal"><span lang="EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span lang="EN-GB" style="font-size:12.0pt;font-family:"Times New Roman",serif"><br>
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