<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN"> <HTML> <HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Generator" CONTENT="MS Exchange Server version 6.5.7638.1"> <TITLE>RE: [Gate-users] Re: Gate-users Digest, Vol 5, Issue 9</TITLE> </HEAD> <BODY>  I do not think "Transportation" process is only for the purpose of transporting between different volumes for particles. Actually, a hit is a step in Geant4. When a particle travels more than a interaction range cut (defined as cut threshold) and if there is not a interaction (processes as compton, photoelectric etc) happened for this particle, then this step (hit) will be labled as "Transportation" process. More accurate way to look for particles crossing a boundary is to find that step associated with prepoint in pre-volume and postpoint in post-volume. Does GATE hit class have those volume names written out? Please correct me if I am wrong and misleading.  Yu Chen, Ph.D. University of Massachusetts Medical School Division of Nuclear Medicine 55 Lake Avenue North Worcester, MA 01655-0243 Phone:  (508) 856-6123 Fax:    (508) 856-4572 -----Original Message----- From: gate-users-bounces@lists.healthgrid.org on behalf of D.J. van der Laan Sent: Fri 10/13/2006 9:15 AM To: gate-users@lists.healthgrid.org Subject: Re: [Gate-users] Re: Gate-users Digest, Vol 5, Issue 9 You could probably use the hits output of Gate for this. One of the columns in this output is the process, and one of the possible processes is 'Transportation', which indicates a particle leaving the sensitive detector. (I think it is leaving, but you'll have to check to be sure.) I hope this solves your problem. Jan PS Below you can find two bash scripts that run a Gate simulation and extract the annihilation coordinates from the hits output, without creating a huge hits file.  Perhaps they are usefull. ======= run.sh =========== #!/bin/bash rm -f gateHits.dat mkfifo gateHits.dat ./process.sh gateHits.dat > annihilations.dat & Gate beamgeometry.mac > screenout rm gateHits.dat ======= process.sh =========== #!/bin/bash cat $1 | grep 'annihil' | gawk '{print $14, $15, $16}' Ben S McDonald wrote: > Howdy Gaters, > > Does anyone know if it is possible to set a flag for a boundary crossing > in Gate (e.g. did particles pass through volume without interacting)? > I'm trying to quantify pinhole penetration other than by just > ray-tracing between the sourcePos and globalPos stored variables. > > Thanks for any help, > > Ben McDonald > _______________________________________________ > Gate-users mailing list > Gate-users@lists.healthgrid.org > <A HREF="http://lists.healthgrid.org/mailman/listinfo/gate-users">http://lists.healthgrid.org/mailman/listinfo/gate-users</A> -- D.J. van der Laan Delft University of Technology Mekelweg 15, room 2.00.020 2629 JB Delft The Netherlands E: d.j.vanderlaan@tnw.tudelft.nl T: +31 15 2783776 F: +31 15 2789011 _______________________________________________ Gate-users mailing list Gate-users@lists.healthgrid.org <A HREF="http://lists.healthgrid.org/mailman/listinfo/gate-users">http://lists.healthgrid.org/mailman/listinfo/gate-users</A> </BODY> </HTML>