[Gate-users] "Forbid" command: cold source simulation inside a background hot source

Wed May 16 12:53:55 CEST 2018

Hi Sara,
The example I wrote before should do that (I didn't test it, but I have
simulated similar sources before). One detail I missed previously is that
you need to include the line "/gate/run/initialize" before defining your
sources (but after defining innerCylinder1).

Martin

On Tue, May 15, 2018 at 3:25 PM, Sara Zein <saz2007 at med.cornell.edu> wrote:

> Hi Martin,
>
>
>
> We want our cold source to be located inside a cylinder that has activity.
> When using the “forbid’ command we are trying to get a completely cold
> source without any activity. However, we are not able to eliminate the
> background activity from the container cylinder. We tried to apply the
> solutions suggested by the Gate users but till now we are not successful.
> We appreciate all the suggestions.
>
>
>
> Thank you
>
>
>
> Sara
>
>
>
> *From:* Martín Belzunce <martin.sure at gmail.com>
> *Sent:* Monday, May 14, 2018 3:32 PM
> *To:* Nicolas Karakatsanis <nicolas.karakatsanis at gmail.com>
> *Cc:* gate-users <gate-users at lists.opengatecollaboration.org>; Sara Zein <
> saz2007 at med.cornell.edu>
> *Subject:* [EXTERNAL] Re: [Gate-users] "Forbid" command: cold source
> simulation inside a background hot source
>
>
>
> Hi Nikolaos, Sara,
>
> The forbid command should be used with the source TubeSource1. It's not
> necessary to define a new source for the cold region. In my experience,
> something like this should work:
>
>
>
> /gate/world/daughters/insert cylinder
> /gate/innerCylinder1/placement/setTranslation 0.0 0.0 0.0 cm
> /gate/innerCylinder1/geometry/setRmax 1.5 cm
> /gate/innerCylinder1/geometry/setHeight 6.0 cm
> /gate/innerCylinder1/setMaterial Water
> /gate/innerCylinder1/vis/forceWireframe
> /gate/innerCylinder1/vis/setColor blue
>
>
>
> /gate/source/addSource TubeSource1
> /gate/source/TubeSource1/gps/type Volume
> /gate/source/TubeSource1/gps/shape Cylinder
> /gate/source/TubeSource1/gps/radius 3.0 cm
> /gate/source/TubeSource1/gps/halfz 3.0 cm
> /gate/source/TubeSource1/setActivity 2000000 becquerel   #### to be
> specified
> /gate/source/TubeSource1/gps/particle e+
> /gate/source/TubeSource1/setForcedUnstableFlag true
> /gate/source/TubeSource1/gps/energytype Fluor18
> /gate/source/TubeSource1/setForcedHalfLife 6586.2 s
> /gate/source/TubeSource1/gps/angtype iso
> /gate/source/TubeSource1/gps/centre 0. 0. 0 cm
>
> /gate/source/TubeSource1/gps/Forbid innerCylinder1
>
>
>
> Kind regards,
>
> Martin
>
>
>
> On Wed, May 9, 2018 at 7:02 PM, Nicolas Karakatsanis <
> nicolas.karakatsanis at gmail.com> wrote:
>
> Dear
>
> GATE users
>
> ,
>
> On behalf of my colleague, Dr. Sara Zein, I am forwarding you her
> question below.
>
> We
>
>  would appreciate any help from the GATE community.  
>
>
>
> We would like
>
>  to simulate a cylindrical radioactive source having a hollow center
> without activity.
>
> We are
>
>  using the cold source command "Forbid" on the region
>
> we wish
>
>  to exclude from
>
> our
>
>  source. However the background activity from the larger source still
> persists.
>
> 
>
> Below you
>
> may
>
> find
>
> our
>
> code.
>
> /gate/source/addSource TubeSource1
> /gate/source/TubeSource1/gps/type Volume
> /gate/source/TubeSource1/gps/shape Cylinder
> /gate/source/TubeSource1/gps/radius 3.0 cm
> /gate/source/TubeSource1/gps/halfz 3.0 cm
> /gate/source/TubeSource1/setActivity 2000000 becquerel   #### to be
> specified
> /gate/source/TubeSource1/gps/particle e+
> /gate/source/TubeSource1/setForcedUnstableFlag true
> /gate/source/TubeSource1/gps/energytype Fluor18
> /gate/source/TubeSource1/setForcedHalfLife 6586.2 s
> /gate/source/TubeSource1/gps/angtype iso
> /gate/source/TubeSource1/gps/centre 0. 0. 0 cm
>
> /gate/world/daughters/name innerCylinder1
> /gate/world/daughters/insert cylinder
> /gate/innerCylinder1/placement/setTranslation 0.0 0.0 0.0 cm
> /gate/innerCylinder1/geometry/setRmax 1.5 cm
> /gate/innerCylinder1/geometry/setHeight 6.0 cm
> /gate/innerCylinder1/setMaterial Water
> /gate/innerCylinder1/vis/forceWireframe
> /gate/innerCylinder1/vis/setColor blue
>
> /gate/source/addSource TubeSource2
> /gate/source/TubeSource2/gps/type Volume
> /gate/source/TubeSource2/gps/shape Cylinder
> /gate/source/TubeSource2/gps/radius 1.5 cm
> /gate/source/TubeSource2/gps/halfz 3 cm
> /gate/source/TubeSource2/setActivity 2000000 becquerel   #### to be
> specified
> /gate/source/TubeSource2/gps/particle gamma
> /gate/source/TubeSource2/gps/monoenergy 511. keV
> /gate/source/TubeSource2/gps/angtype iso
> /gate/source/TubeSource2/gps/centre 0. 0. 0 cm
> /gate/source/TubeSource2/gps/Forbid innerCylinder1
> /gate/source/TubeSource2/dump 1
> /gate/source/list
>
>
> Thank you
>
>  in advance
>
> ,
> Regards
>
> Sara Zein
>
>
>
>
>
> *Nikolaos (Nicolas) A.* *Karakatsanis, PhD, DABSNM*
> Assistant Professor of Biomedical Engineering in Radiology
> Weill Cornell Medical College
>
> *Weill Cornell Medicine*
> Division of Radiopharmaceutical Sciences, Department of Radiology
> 515 East 71st Street
> <https://maps.google.com/?q=515+East+71st+Street&entry=gmail&source=g>,
> S-120, New York, NY 10021
> nak2032 at med.cornell.edu
>
>
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