<div dir="ltr">Dear <div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline">GATE users</div>,<br><br><div class="gmail_default" style="font-family:tahoma,sans-serif">On behalf of my colleague, Dr. Sara Zein, I am forwarding you her question below. </div><div class="gmail_default" style="font-family:tahoma,sans-serif">
<div class="gmail_default" style="color:rgb(34,34,34);font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;font-family:tahoma,sans-serif;display:inline">We</div><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:small;font-style:normal;font-variant-ligatures:normal;font-variant-caps:normal;font-weight:400;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-color:rgb(255,255,255);text-decoration-style:initial;text-decoration-color:initial;float:none;display:inline"> would appreciate any help from the GATE community.</span>
</div><br><div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline">We would like</div> to simulate a cylindrical radioactive source having a hollow center without activity. <div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline">We are</div> using the cold source command "Forbid" on the region <div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline">we wish</div> to exclude from <div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline">our</div> source. However the background activity from the larger source still persists. <div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline"></div><div>Below you <div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline">may</div> find <div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline">our</div> code.<br><br>/gate/source/addSource TubeSource1<br>/gate/source/TubeSource1/gps/type Volume<br>/gate/source/TubeSource1/gps/shape Cylinder<br>/gate/source/TubeSource1/gps/radius 3.0 cm<br>/gate/source/TubeSource1/gps/halfz 3.0 cm<br>/gate/source/TubeSource1/setActivity 2000000 becquerel #### to be specified<br>/gate/source/TubeSource1/gps/particle e+<br>/gate/source/TubeSource1/setForcedUnstableFlag true<br>/gate/source/TubeSource1/gps/energytype Fluor18<br>/gate/source/TubeSource1/setForcedHalfLife 6586.2 s<br>/gate/source/TubeSource1/gps/angtype iso<br>/gate/source/TubeSource1/gps/centre 0. 0. 0 cm<br><br>/gate/world/daughters/name innerCylinder1<br>/gate/world/daughters/insert cylinder<br>/gate/innerCylinder1/placement/setTranslation 0.0 0.0 0.0 cm<br>/gate/innerCylinder1/geometry/setRmax 1.5 cm<br>/gate/innerCylinder1/geometry/setHeight 6.0 cm<br>/gate/innerCylinder1/setMaterial Water<br>/gate/innerCylinder1/vis/forceWireframe<br>/gate/innerCylinder1/vis/setColor blue<br><br>/gate/source/addSource TubeSource2<br>/gate/source/TubeSource2/gps/type Volume<br>/gate/source/TubeSource2/gps/shape Cylinder<br>/gate/source/TubeSource2/gps/radius 1.5 cm<br>/gate/source/TubeSource2/gps/halfz 3 cm<br>/gate/source/TubeSource2/setActivity 2000000 becquerel #### to be specified<br>/gate/source/TubeSource2/gps/particle gamma<br>/gate/source/TubeSource2/gps/monoenergy 511. keV<br>/gate/source/TubeSource2/gps/angtype iso<br>/gate/source/TubeSource2/gps/centre 0. 0. 0 cm<br>/gate/source/TubeSource2/gps/Forbid innerCylinder1<br>/gate/source/TubeSource2/dump 1<br>/gate/source/list<br> <br><br>Thank you<div class="gmail_default" style="font-family:tahoma,sans-serif;display:inline"> in advance</div>,<br>Regards</div><div><div class="gmail_default" style="font-family:tahoma,sans-serif">Sara Zein</div><br><div><br><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><p><a name="UNIQUE_ID_SafeHtmlFilter_UNIQUE_ID_SafeHtmlFilter__MailAutoSig"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#e87722">Nikolaos (Nicolas) A.</span></b></a><span style="font-size:10pt;font-family:Helvetica,sans-serif;color:black;background-image:initial;background-position:initial;background-repeat:initial"> </span><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#e87722">Karakatsanis, PhD, DABSNM</span></b><span style="font-size:9pt;font-family:Helvetica,sans-serif;color:black;background-image:initial;background-position:initial;background-repeat:initial"> </span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#777777">Assistant Professor
of Biomedical Engineering in Radiology</span><span style="font-size:9pt;font-family:Helvetica,sans-serif;color:black;background-image:initial;background-position:initial;background-repeat:initial"> </span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#777777">Weill
Cornell Medical College<br>
</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black"><br>
</span><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#cf4520">Weill Cornell Medicine</span></b><span style="font-size:9pt;font-family:Arial,sans-serif;color:black;background-image:initial;background-position:initial;background-repeat:initial"> </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#777777">Division
of Radiopharmaceutical Sciences, Department of Radiology</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:black;background-image:initial;background-position:initial;background-repeat:initial"> </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#777777">515 East
71st Street, S-120</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:black;background-image:initial;background-position:initial;background-repeat:initial">, </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#777777">New York, NY</span><span style="font-size:9pt;font-family:Arial,sans-serif;color:black;background-image:initial;background-position:initial;background-repeat:initial"> </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#777777">10021</span><span style="font-size:9.0pt;font-family:"Helvetica",sans-serif;color:black"><br>
</span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#0563c1"><a href="mailto:nak2032@med.cornell.edu" target="_blank">nak2032@med.cornell.edu</a> </span><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#777777"></span></p></div><div dir="ltr"><span style="font-size:12px;color:rgb(119,119,119);font-family:Arial"></span></div></div></div></div></div></div></div></div></div>
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