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

[Sara Zein]

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<mailto: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<mailto:nak2032 at med.cornell.edu>

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