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

[Nicolas Karakatsanis]

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
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