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

[Martín Belzunce]

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, S-120, New York, NY 10021
> nak2032 at med.cornell.edu
>
> _______________________________________________
> Gate-users mailing list
> Gate-users at lists.opengatecollaboration.org
> http://lists.opengatecollaboration.org/mailman/listinfo/gate-users
>
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