Dear Gate-users,<br>  I'm confused when I simulated the Dosimetry generated by F-18.<br>  When I defined the source as a "e+" in a Cylinder geometry,<br>  the result seems it dose not have influence on the other region, as shown in appendix Fig1.png.<br><br>  When I defined the source as beam, a 0.511 MeV gamma ray, radiate the phantom, the result shows better.<br>  It had influence on a long region, as shown in appedix Fig2.png.<br>  <br>  So confused am I, thanks everyone!<br>  Your Sincerely,<br>  Quan<br><!-- trs files --><br><div id="largeAttachmentsBox" style="padding: 4px; margin-bottom: 15px; background-color:#e3e3e3; width: auto; font-family: Verdana,Arial,Tahoma; font-size: 14px;"><hr style="display: none;"/><div style="padding: 6px 0pt 10px 6px; text-align: left;"><b style="font-size: 14px;">从lzu.edu.cn发来的超大附件</b></div><div style="padding: 0pt 8px 6px 12px; background: rgb(255, 255, 255) none repeat scroll 0% 0%;-moz-background-clip: border; -moz-background-origin: padding;-moz-background-inline-policy: continuous;"> <div style="clear: both;"><div style="clear: both;" ><div style="padding: 10px 0pt; font-size: 12px;"> <div style="float: left;margin-right: 8px;margin-top:2px;"><b class="bico bfMSWORD"></b></div><div class="bigatt_bt" title=""><div class="name_big" ><span><a href="https://mail.lzu.edu.cn/coremail/viewDownloadFile.jsp?key=1U31SsvkjqFu3sKBSe8GFAjdhBxLas2Co9FLUu2kTDaDSstESZ0Lau2Gr4fdantETemCo9IkScKyTgGka1AGonECzcqpS4AGFC_Xr47JrylpS4AGFC_Xr47Jr1UJwZECz45Jr4fMTuYBzVFAScKdhBxLas2Co9FLwujXTWCdhBxmjeIk-s71UUUUU72l39EtjqanVW8Cr1kXF1rWw4kurWUyVuSqT9SAUZCmaUtsU18USUjgUnkU77j2UerUcDj0U18UrDjZU8_USDj0U87UaUjjU88U77jWUnxj-7rYOJEn&code=gdw1qwz3" target="_blank" style="color: rgb(0, 0, 0); text-decoration: none;">Dose-3d-edep.tar.gz</a> <span style="color: rgb(160, 160, 160);"> (60MB, 2021年03月30日 16:08 到期)</span></span><div class="down_big"><a href="https://mail.lzu.edu.cn/coremail/viewDownloadFile.jsp?key=1U31SsvkjqFu3sKBSe8GFAjdhBxLas2Co9FLUu2kTDaDSstESZ0Lau2Gr4fdantETemCo9IkScKyTgGka1AGonECzcqpS4AGFC_Xr47JrylpS4AGFC_Xr47Jr1UJwZECz45Jr4fMTuYBzVFAScKdhBxLas2Co9FLwujXTWCdhBxmjeIk-s71UUUUU72l39EtjqanVW8Cr1kXF1rWw4kurWUyVuSqT9SAUZCmaUtsU18USUjgUnkU77j2UerUcDj0U18UrDjZU8_USDj0U87UaUjjU88U77jWUnxj-7rYOJEn&code=gdw1qwz3" target="_blank"><span style="color:#5d5d5d;text-decoration:underline;">查看下载信息</span></a> </div></div></div></div></div></div></div> </div>