[Gate-users] Cold Region Setting

[Xinjie Cao]

Dear all,

*I am trying to simulate a phantom with some cold regions inside it. When I
follow the introduction and run the macro as follows (just the source
definition part),*

/gate/world/daughters/name                     cold2
/gate/world/daughters/insert                   sphere
/gate/cold2/placement/setTranslation           28.6 49.5 35.0 mm
/gate/cold2/geometry/setRmax                   6.0 mm
/gate/cold2/geometry/setRmin                   0.0 mm

/gate/world/daughters/name                     cold3
/gate/world/daughters/insert                   sphere
/gate/cold3/placement/setTranslation           -28.6 49.5 35.0 mm
/gate/cold3/geometry/setRmax                   7.5 mm
/gate/cold3/geometry/setRmin                   0.0 mm

/gate/world/daughters/name                     cold4
/gate/world/daughters/insert                   sphere
/gate/cold4/placement/setTranslation           -57.2 0.0 35.0 mm
/gate/cold4/geometry/setRmax                   9.5 mm
/gate/cold4/geometry/setRmin                   0.0 mm

/gate/world/daughters/name                     cold5
/gate/world/daughters/insert                   sphere
/gate/cold5/placement/setTranslation           -28.6 -49.5 35.0 mm
/gate/cold5/geometry/setRmax                   12.0 mm
/gate/cold5/geometry/setRmin                   0.0 mm
/gate/cold5/setMaterial                        Polyethylene

/gate/world/daughters/name                     cold6
/gate/world/daughters/insert                   sphere
/gate/cold6/placement/setTranslation           28.6 -49.5 35.0 mm
/gate/cold6/geometry/setRmax                   15.0 mm
/gate/cold6/geometry/setRmin                   0.0 mm

/gate/world/daughters/name                     cold7
/gate/world/daughters/insert                   sphere
/gate/cold7/placement/setTranslation           57.2 0.0 35.0 mm
/gate/cold7/geometry/setRmax                   19.5 mm
/gate/cold7/geometry/setRmin                   0.0 mm

/gate/source/addSource F18SphereSource1
/gate/source/F18SphereSource1/setActivity 10000000. becquerel
/gate/source/F18SphereSource1/gps/particle e+
/gate/source/F18SphereSource1/gps/energytype  Fluor18
/gate/source/F18SphereSource1/gps/monoenergy 511. keV
/gate/source/F18SphereSource1/setForcedUnstableFlag true
/gate/source/F18SphereSource1/setForcedHalfLife 6586 s
/gate/source/F18SphereSource1/gps/type Volume
/gate/source/F18SphereSource1/gps/shape Cylinder
/gate/source/F18SphereSource1/gps/radius 14.7 cm
/gate/source/F18SphereSource1/gps/halfz 21.0 cm
/gate/source/F18SphereSource1/gps/centre 0.0 0.0 0.0 mm
/gate/source/F18SphereSource1/gps/Forbid cold2 cold3 cold4 cold5 cold6 cold7
/gate/source/F18SphereSource1/gps/angtype iso

*The error popped up as follows,*
[Core-0] Initialization of actors
Nof Higher level 4
 Rmin/gate/cold2/geometry/setRmin
 Rmin/gate/cold3/geometry/setRmin
 Rmin/gate/cold4/geometry/setRmin
 Rmin/gate/cold5/geometry/setRmin
 Rmin/gate/cold6/geometry/setRmin
 Rmin/gate/cold7/geometry/setRmin
Confirming activity forbidden in volume 'cold2 cold3 cold4 cold5 cold6
cold7_phys'...
 **** Error: Volume does not exist ****
 Ignoring forbid condition for volume 'cold2 cold3 cold4 cold5 cold6
cold7_phys'

Am I setting it wrong? Or do I need to define the cold regions before the
GATE initialization in the macro with other phantoms?

Any help will be highly appreciated! Thanks!

Best,
Xinjie
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