<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Dear Gaters, <div class=""><br class=""></div><div class="">1. I am simulating positron range in different materials. Using O15 particle source, I have obtained average range of positron as 2.2 mm, using 100000 bq activity and for Ion source range is 1.976 mm. Could anyone tell me what might be cause of this discrepancy? </div><div class=""><br class=""></div><div class="">Attached you will find both positron range plots, I think there might be some problem on data set below 0.5 MeV, above 0.5 MeV both plots seems similar. Is that possible? I have defined the ion source as follows:</div><div class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/addSource O15Source</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/setActivity 100000. becquerel</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/particle ion</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/ion 8 15 0 0</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/energytype Mono</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/monoenergy 0. MeV</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/angtype iso</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/number 1</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/centre 0. 0. 0. cm</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/type Volume</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/shape Sphere</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/radius 0.05 mm</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252); min-height: 13px;" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""></span><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/source/O15Source/gps/confine world</span></div><div class=""><span style="font-family: Menlo; font-size: 11px; background-color: rgb(252, 252, 252);" class="">/gate/source/list</span></div><div class=""><br class=""></div><div class=""> 2. I am also using the track length actor to store the track of positrons. I think this track length is positron range in. But the plots, I am getting i.e attached figure ( O15_Particle_source_Pos_range_in_water.png) is different than figure named (Tracklength.png). Can we use track length actor to store positron range i. e track length of positron? I have used the following macros to store each tracks:</div><div class=""><br class=""></div><div class=""><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/actor/addActor TrackLengthActor TLA</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/actor/TLA/save tracklength.root</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/actor/TLA/setLmin 0 mm</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/actor/TLA/setLmax 10 mm</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/actor/TLA/setNumberOfBins 200</span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class="">/gate/actor/TLA/attachTo phantom</span></div></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class=""></span></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class=""></span></div><div style="margin: 0px; line-height: normal; background-color: rgb(252, 252, 252);" class="">I really appreciate your help. Thank you.</div><div style="margin: 0px; line-height: normal; background-color: rgb(252, 252, 252);" class=""><br class=""></div><div style="margin: 0px; line-height: normal; background-color: rgb(252, 252, 252);" class=""><br class=""></div><div style="margin: 0px; line-height: normal; background-color: rgb(252, 252, 252);" class="">Regards, </div><div style="margin: 0px; line-height: normal; background-color: rgb(252, 252, 252);" class="">Ashok Tiwari</div><div style="margin: 0px; line-height: normal; background-color: rgb(252, 252, 252);" class="">Ph.D. Student</div><div style="margin: 0px; line-height: normal; background-color: rgb(252, 252, 252);" class="">Univ. of Iowa</div><div style="margin: 0px; line-height: normal; background-color: rgb(252, 252, 252);" class=""><br class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><br class=""></div><div style="margin: 0px; line-height: normal; background-color: rgb(252, 252, 252);" class=""><img height="458" width="773" apple-width="yes" apple-height="yes" apple-inline="yes" id="5A31AFAF-942F-4820-8EDB-D0D0DF55C2E6" src="cid:526BD685-563E-421E-90D3-8F8282ABE5E7@healthcare.uiowa.edu" class=""><img height="322" width="534" apple-width="yes" apple-height="yes" apple-inline="yes" id="E53B06EB-C91F-4C92-BC03-6528581FB582" src="cid:F5BCBA46-8D4C-4EEF-AF73-2A1F48EDDA50@healthcare.uiowa.edu" class=""><img height="630" width="773" apple-width="yes" apple-height="yes" apple-inline="yes" id="BA757FE0-2E47-4E79-A5EB-8D510E7139AB" src="cid:75644ED9-0810-41F6-83C2-F6ED6C670771@healthcare.uiowa.edu" class=""></div><div style="margin: 0px; font-size: 11px; line-height: normal; font-family: Menlo; background-color: rgb(252, 252, 252);" class=""><span style="font-variant-ligatures: no-common-ligatures" class=""><br class=""></span></div></body></html>