[Gate-users] Re : issues with the ion source

[Marta.Lai at ca.infn.it]

the 0 keV energy is the energy of the positron that will annihilate in the
same place it was produced.
fortunately I've fixed the problem by myself! in the version 6 you have to
specify the process:

/gate/physics/addProcess RadioactiveDecay

in the physics list, although you have already specified that the ion is
unstable.
thanks for your advice,
Marta

> Of course ... with a 0keV energy your particle will not go far away ...
>
>
>
> Samuel Burg
>
>
> CHU Bichat Claude Bernard
> 75018 Paris
>
>
>
> ________________________________
> De : "Marta.Lai at ca.infn.it" <Marta.Lai at ca.infn.it>
> À : gate-users at lists.opengatecollaboration.org
> Envoyé le : Jeu 21 octobre 2010, 10h 40min 39s
> Objet : [Gate-users] issues with the ion source
>
> I'm trying to run a PET simulation with an ion source of Sodium22 with
> Gate v6.0.
> My source is defined with the command lines:
>
>
>
> /gate/source/addSource                                         posiNa22
>
> /gate/source/posiNa22/gps/particle                              ion
> /gate/source/posiNa22/gps/ion                    11 22 0 0
> /gate/source/posiNa22/gps/monoenergy                0. keV
> /gate/source/posiNa22/setActivity                               635000.
> becquerel
> /gate/source/posiNa22/gps/type                    Volume
> /gate/source/posiNa22/gps/shape                    Sphere
> /gate/source/posiNa22/gps/radius                0.5 mm
> /gate/source/posiNa22/gps/centre                0.0 0.0 0.0 mm
> /gate/source/posiNa22/setForcedUnstableFlag                     true
> /gate/source/posiNa22/setForcedHalfLife                         984680064.
> s
> /gate/source/posiNa22/gps/angtype                               iso
> /gate/source/posiNa22/gps/monoenergy                0. keV
>
> /gate/source/list
>
> when I run the simulation I don't obtain any output (there is the output
> .root but it's empty), that is the detector doesn't see any gamma ray from
> the decay of the source.
> I've tried a twogamma source and it works and it also works with a
> positron source. Maybe there's some troubles with the physics list:
>
> /gate/physics/addProcess PhotoElectric
> /gate/physics/addProcess Compton
> /gate/physics/addProcess GammaConversion
> /gate/physics/addProcess LowEnergyRayleighScattering
> /gate/physics/addProcess ElectronIonisation
> /gate/physics/addProcess Bremsstrahlung
> /gate/physics/addProcess PositronAnnihilationStd
> /gate/physics/addProcess MultipleScattering e+
> /gate/physics/addProcess MultipleScattering e-
> /gate/physics/processList Enabled
> /gate/physics/processList Initialized
>
> or the cuts:
>
> gate/physics/Gamma/SetCutInRegion      COO 0.1 keV
> /gate/physics/Electron/SetCutInRegion   COO 1.0 m
> /gate/physics/Gamma/SetCutInRegion      CEE 0.1 keV
> /gate/physics/Electron/SetCutInRegion   CEE 1.0 m
> /gate/physics/Gamma/SetCutInRegion      COOO 0.1 keV
> /gate/physics/Electron/SetCutInRegion   COOO 1.0 m
> /gate/physics/Gamma/SetCutInRegion      CEEE 0.1 keV
> /gate/physics/Electron/SetCutInRegion   CEEE 1.0 m
> /gate/physics/Gamma/SetCutInRegion      phantom 0.1 keV
> /gate/physics/Electron/SetCutInRegion   phantom 1.0 m
>
> Can anybody help me?
> thanks, Marta
>
>
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