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

[Konstantinos P. Chatzipapas, MSc]

Hello Sara and Nicolas,
I can see that your innerCylinder1 is not daughter of your TubeSource2. This way Forbid, cannot locate it.
Try to make innerCylinder1 daughter of the TubeSource2. Moreover, at the beginning, create a big enough source, in order to be able to tell for sure that innerCylinder1 irradiates or not. 
Kind regards,Konstantinos
P.S.: I hope that you use an updated version of GATE (>7.2). ----------------------------------------------------- Konstantinos Chatzipapas
    Medical Physicist, MSc
       University of Patras
    web page: Physics Magazine 

    Στις 9:05 μ.μ. Τετάρτη, 9 Μαΐου 2018, ο/η Nicolas Karakatsanis <nicolas.karakatsanis at gmail.com> έγραψε:
 

 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 Professorof Biomedical Engineering in Radiology 
WeillCornell Medical College

Weill Cornell Medicine 
Divisionof Radiopharmaceutical Sciences, Department of Radiology 
515 East71st Street, S-120, New York, NY 10021
nak2032 at med.cornell.edu _______________________________________________
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