<div dir="ltr"><div class="gmail_default" style="font-family:georgia,serif;font-size:large">Dear all,</div><div class="gmail_default" style="font-family:georgia,serif;font-size:large"><br></div><div class="gmail_default" style="font-family:georgia,serif;font-size:large">I tried your suggestions. Making a extreme high density could induce relatively high back scatter events. Using the kill actor is much better and it worked with 99.963% simulated events killed in the a thin surface. Thank you both for your suggestions.</div><div class="gmail_default" style="font-family:georgia,serif;font-size:large"><br></div><div class="gmail_default" style="font-family:georgia,serif;font-size:large">Best wishes,</div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><p><i><span style="font-family:georgia,serif"><font size="4"><span lang="EN-US">Hancong Xu</span></font></span></i></p><p><font size="2"><span><font face="Times New Roman"><i>Institution of Neuroscience and Medicine (INM4)</i></font></span></font><font face="Times New Roman"><i><font size="2"><br></font></i></font></p><p><font face="Times New Roman"><i><font size="2">Forschungzentrum Juelich, Germany</font><br></i></font></p></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
<br><div class="gmail_quote">2017-07-26 17:39 GMT+02:00 Andreas Resch <span dir="ltr"><<a href="mailto:andreas.resch@meduniwien.ac.at" target="_blank">andreas.resch@meduniwien.ac.at</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
you could maybe also use the kill actor.<br>
<a href="http://wiki.opengatecollaboration.org/index.php/Users_Guide_V7.2:Readout_parameters_for_Radiotherapy_applications:_Actors#Kill_track" rel="noreferrer" target="_blank">http://wiki.opengatecollaborat<wbr>ion.org/index.php/Users_Guide_<wbr>V7.2:Readout_parameters_for_Ra<wbr>diotherapy_applications:_Actor<wbr>s#Kill_track</a><br>
<br>
and optionally add a particle filter<br>
<a href="http://wiki.opengatecollaboration.org/index.php/Users_Guide_V7.2:Readout_parameters_for_Radiotherapy_applications:_Actors#Filter_on_particle_type" rel="noreferrer" target="_blank">http://wiki.opengatecollaborat<wbr>ion.org/index.php/Users_Guide_<wbr>V7.2:Readout_parameters_for_Ra<wbr>diotherapy_applications:_Actor<wbr>s#Filter_on_particle_type</a><br>
<br>
<br>
Cheers,<br>
Andreas<span class=""><br>
<br>
<br>
Am 2017-07-26 17:28, schrieb Beien Wang:<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
hi hancong,<br>
<br>
make a very thin but extreme dense material just outside the surface<br>
is should work. you can change the density in Gatematerial. db<br>
<br>
Best,<br>
Beien Wang<br>
<br>
2017年7月26日 16:29，"韩匆" <<a href="mailto:hancong59@gmail.com" target="_blank">hancong59@gmail.com</a>>写道：<br>
<br>
</span><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class="">
Dear all,<br>
<br>
Is it possible to create a 100% stopping surface for r rays in GATE,<br>
which acts the same as the edge of the "world"?  If possible, then<br>
how? Many thanks.<br>
​​<br>
<br>
​Cheers,​<br>
<br></span>
_Hancong Xu_<br>
<br>
_Institution of Neuroscience and Medicine (INM4)_<span class=""><br>
<br>
Forschungzentrum Juelich, Germany<br>
<br>
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