<div dir="ltr">Dear all,<div><br></div><div><b>I am trying to simulate a phantom with some<i> <font size="4">cold regions</font></i> inside it. When I follow the introduction and run the macro as follows (just the source definition part),</b></div><div><br></div><div>/gate/world/daughters/name                     cold2<br>/gate/world/daughters/insert                   sphere<br>/gate/cold2/placement/setTranslation           28.6 49.5 35.0 mm<br>/gate/cold2/geometry/setRmax                   6.0 mm<br>/gate/cold2/geometry/setRmin                   0.0 mm<br><br>/gate/world/daughters/name                     cold3<br>/gate/world/daughters/insert                   sphere<br>/gate/cold3/placement/setTranslation           -28.6 49.5 35.0 mm<br>/gate/cold3/geometry/setRmax                   7.5 mm<br>/gate/cold3/geometry/setRmin                   0.0 mm<br><br>/gate/world/daughters/name                     cold4<br>/gate/world/daughters/insert                   sphere<br>/gate/cold4/placement/setTranslation           -57.2 0.0 35.0 mm<br>/gate/cold4/geometry/setRmax                   9.5 mm<br>/gate/cold4/geometry/setRmin                   0.0 mm<br><br>/gate/world/daughters/name                     cold5<br>/gate/world/daughters/insert                   sphere<br>/gate/cold5/placement/setTranslation           -28.6 -49.5 35.0 mm<br>/gate/cold5/geometry/setRmax                   12.0 mm<br>/gate/cold5/geometry/setRmin                   0.0 mm<br>/gate/cold5/setMaterial                        Polyethylene<br><br>/gate/world/daughters/name                     cold6<br>/gate/world/daughters/insert                   sphere<br>/gate/cold6/placement/setTranslation           28.6 -49.5 35.0 mm<br>/gate/cold6/geometry/setRmax                   15.0 mm<br>/gate/cold6/geometry/setRmin                   0.0 mm<br><br>/gate/world/daughters/name                     cold7<br>/gate/world/daughters/insert                   sphere<br>/gate/cold7/placement/setTranslation           57.2 0.0 35.0 mm<br>/gate/cold7/geometry/setRmax                   19.5 mm<br>/gate/cold7/geometry/setRmin                   0.0 mm<br><br>/gate/source/addSource F18SphereSource1<br>/gate/source/F18SphereSource1/setActivity 10000000. becquerel<br>/gate/source/F18SphereSource1/gps/particle e+<br>/gate/source/F18SphereSource1/gps/energytype  Fluor18<br>/gate/source/F18SphereSource1/gps/monoenergy 511. keV<br>/gate/source/F18SphereSource1/setForcedUnstableFlag true<br>/gate/source/F18SphereSource1/setForcedHalfLife 6586 s<br>/gate/source/F18SphereSource1/gps/type Volume<br>/gate/source/F18SphereSource1/gps/shape Cylinder<br>/gate/source/F18SphereSource1/gps/radius 14.7 cm<br>/gate/source/F18SphereSource1/gps/halfz 21.0 cm<br>/gate/source/F18SphereSource1/gps/centre 0.0 0.0 0.0 mm<br>/gate/source/F18SphereSource1/gps/Forbid cold2 cold3 cold4 cold5 cold6 cold7<br>/gate/source/F18SphereSource1/gps/angtype iso<br></div><div><br></div><div><b><font size="4">The error popped up as follows,</font></b></div><div>[Core-0] Initialization of actors<br>Nof Higher level 4<br> Rmin/gate/cold2/geometry/setRmin<br> Rmin/gate/cold3/geometry/setRmin<br> Rmin/gate/cold4/geometry/setRmin<br> Rmin/gate/cold5/geometry/setRmin<br> Rmin/gate/cold6/geometry/setRmin<br> Rmin/gate/cold7/geometry/setRmin<br>Confirming activity forbidden in volume 'cold2 cold3 cold4 cold5 cold6 cold7_phys'...<br> **** Error: Volume does not exist **** <br> Ignoring forbid condition for volume 'cold2 cold3 cold4 cold5 cold6 cold7_phys'<br></div><div><br></div><div>Am I setting it wrong? Or do I need to define the cold regions before the GATE initialization in the macro with other phantoms?</div><div><br></div><div>Any help will be highly appreciated! Thanks!</div><div><br></div><div>Best,</div><div>Xinjie</div><div><br></div><div></div></div>