[Gate-users] Why Y90 has different energy distributions when using ion source and fastY90 source?

[Jinxia Guo]

Paulo,

The phantom and source size didn't have effects on the energy
distributions. I checked the physic interactions in the hits data.
PhotonElectric, RayleighScatter and ComptonScatter were found in fastY90
simulation. Besides these three, plenty of ElectricIonization and
Bremsstrahlung were also found in ion source simultions. These two kinds of
interaction in crystals may be the reason of the difference in the energy
distributions. Maybe they were forbidden in fastY90 source.


Anyway, thanks!

Jinxia

2017-01-24 0:35 GMT+08:00 Paulo Caribé <Paulo.Caribe at ugent.be>:

> Jinxia,
>
> make sure that your phantom and source are in the same size. Have you
> tried it in this away?
>
> 1）Setting1: simulation with fastY90
>
> #-----------------Phantom--------------------------------
>
> /gate/cylinder_phantom/geometry/setHeight 30.5  cm (You should put
>  setHeight = 30.065  cm)
>
> #-----------------Source--------------------------------
>
> /gate/source/ionsrc/gps/halfz  15.0325 cm
>
> ##########################################
>
>
> 2）Setting2: simulation with the ion source
>
> #-----------------Phantom--------------------------------
>
> /gate/cylinder_phantom/geometry/setHeight 30.065  cm
>
> #-----------------Source--------------------------------
>
> /gate/source/ionsrc/gps/halfz  15.0325 cm
>
> ##########################################################
>
> Regards,
>
> Doctoral researcher
> Ghent University - iMinds Medical IT
> Medical Imaging and Signal Processing (MEDISIP)
> IBiTech - Campus UZ - Entrance 36 (Block B)
> De Pintelaan 185
> B-9000 Gent
> Belgium
>
>
>
> On 23 Jan 2017, at 15:30, Jinxia Guo <jinxia.guo2009 at gmail.com> wrote:
>
> Hi guys,
>
>
> Recently I’ve done some simulation with Y90 source in Gate7.2 develop
> version. Two settings are with the same camera, digitizer and output but
> respectively with normal ion source and fastY90 source.  The energy
> distributions of singles in coincidences for each setting are shown below. It
> seems that the energy distribution with the normal ion source is very
> different with the fastY90 source. I thought they should be the same, but
> why the results actually are not? Anything wrong in the simulations
> setting? Thanks!
>
>
> *The energy distributions of each setting.*
>
> (1)   fastY90 source (energy window: [420, inf])                (2)   ion
> source (energy window:[420, inf])
>
>
>
>
>        (3) fastY90 source (energy window: [0, inf])
>     (4)   ion source (energy window:[0, inf])
>
>
>
>
> （1）Setting1: simulation with fastY90
>
> #-----------------Phantom--------------------------------
>
> /gate/world/daughters/name cylinder_phantom
>
> /gate/world/daughters/insert cylinder
>
> /gate/cylinder_phantom/setMaterial Water
>
> /gate/cylinder_phantom/geometry/setRmax   10  cm
>
> /gate/cylinder_phantom/geometry/setRmin   0  cm
>
> /gate/cylinder_phantom/geometry/setHeight 30.5  cm
>
> /gate/cylinder_phantom/placement/setTranslation 0. 0. 0. mm
>
> /gate/cylinder_phantom/attachPhantomSD
>
>
> #-----------------Source--------------------------------
>
> /gate/source/addSource ionsrc fastY90
>
> /gate/source/ionsrc/setActivity 0.1 Ci
>
> /gate/source/ionsrc/useDefaultHalfLife
>
> /gate/source/ionsrc/gps/angtype iso
>
> /gate/source/ionsrc/gps/number 1
>
>
> /gate/source/ionsrc/setMinBremEnergy 50 keV
>
> /gate/source/ionsrc/setPositronProbability 0.00003186
>
>
> /gate/source/ionsrc/gps/type Volume
>
> /gate/source/ionsrc/gps/shape Cylinder
>
> /gate/source/ionsrc/gps/radius  10 cm
>
> /gate/source/ionsrc/gps/halfz  15.0325 cm
>
> /gate/source/ionsrc/gps/centre 0. 0. 0. Mm
>
> /gate/source/ionsrc/gps/confine cylinder_phantom
>
>
> #-----------------Physics--------------------------------
>
> /gate/physics/addProcess Decay
>
> /gate/physics/addProcess RadioactiveDecay
>
>
> /gate/physics/addProcess PhotoElectric
>
> /gate/physics/processes/PhotoElectric/setModel StandardModel
>
>
> /gate/physics/addProcess Compton
>
> /gate/physics/processes/Compton/setModel StandardModel
>
>
> /gate/physics/addProcess RayleighScattering
>
> /gate/physics/processes/RayleighScattering/setModel PenelopeModel
>
>
> /gate/physics/addProcess ElectronIonisation
>
> /gate/physics/processes/ElectronIonisation/setModel StandardModel e-
>
> /gate/physics/processes/ElectronIonisation/setModel StandardModel e+
>
>
> /gate/physics/addProcess Bremsstrahlung
>
> /gate/physics/processes/Bremsstrahlung/setModel StandardModel e-
>
> /gate/physics/processes/Bremsstrahlung/setModel StandardModel e+
>
>
> /gate/physics/addProcess PositronAnnihilation
>
> /gate/physics/addProcess MultipleScattering e+
>
> /gate/physics/addProcess MultipleScattering e-
>
>
> /gate/physics/setEMin 0.1 keV
>
> /gate/physics/setEMax 2.0 GeV
>
> /gate/physics/setDEDXBinning 220
>
> /gate/physics/setLambdaBinning 220
>
>
> /gate/physics/processList Enabled
>
> /gate/physics/processList Initialized
>
>
> （2）Setting2: simulation with the ion source
>
> #-----------------Phantom--------------------------------
>
> /gate/world/daughters/name cylinder_phantom
>
> /gate/world/daughters/insert cylinder
>
> /gate/cylinder_phantom/setMaterial Water
>
> /gate/cylinder_phantom/geometry/setRmax   10  cm
>
> /gate/cylinder_phantom/geometry/setRmin   0  cm
>
> /gate/cylinder_phantom/geometry/setHeight 30.065  cm
>
> /gate/cylinder_phantom/placement/setTranslation 0. 0. 0. mm
>
> /gate/cylinder_phantom/attachPhantomSD
>
>
> #-----------------Source--------------------------------
>
> /gate/source/addSource ionsrc
>
> /gate/source/ionsrc/setActivity 0.10 Ci
>
> /gate/source/ionsrc/gps/particle ion
>
> /gate/source/ionsrc/gps/ion 39 90 0 0
>
> /gate/source/ionsrc/setForcedUnstableFlag true
>
> #/gate/source/ionsrc/setForcedHalfLife 230544 s
>
> /gate/source/ionsrc/useDefaultHalfLife
>
> /gate/source/ionsrc/gps/angtype iso
>
> /gate/source/ionsrc/gps/number 1
>
>
> /gate/source/ionsrc/gps/type Volume
>
> /gate/source/ionsrc/gps/shape Cylinder
>
> /gate/source/ionsrc/gps/radius  10 cm
>
> /gate/source/ionsrc/gps/halfz  15.0325 cm
>
> /gate/source/ionsrc/gps/centre 0. 0. 0. mm
>
>
> /gate/source/ionsrc/gps/confine cylinder_phantom
>
>
> #-----------------Physics--------------------------------
>
> /gate/physics/addProcess Decay
>
> /gate/physics/addProcess RadioactiveDecay
>
>
> /gate/physics/addProcess PhotoElectric
>
> /gate/physics/processes/PhotoElectric/setModel StandardModel
>
>
> /gate/physics/addProcess Compton
>
> /gate/physics/processes/Compton/setModel StandardModel
>
>
> /gate/physics/addProcess RayleighScattering
>
> /gate/physics/processes/RayleighScattering/setModel PenelopeModel
>
>
> /gate/physics/addProcess GammaConversion
>
> /gate/physics/processes/GammaConversion/setModel StandardModel
>
>
> /gate/physics/addProcess ElectronIonisation
>
> /gate/physics/processes/ElectronIonisation/setModel StandardModel e-
>
> /gate/physics/processes/ElectronIonisation/setModel StandardModel e+
>
>
> /gate/physics/addProcess Bremsstrahlung
>
> /gate/physics/processes/Bremsstrahlung/setModel StandardModel e-
>
> /gate/physics/processes/Bremsstrahlung/setModel StandardModel e+
>
>
> /gate/physics/addProcess PositronAnnihilation
>
> /gate/physics/addProcess MultipleScattering e+
>
> /gate/physics/addProcess MultipleScattering e-
>
>
> /gate/physics/setEMin 0.1 keV
>
> /gate/physics/setEMax 2.0 GeV
>
> /gate/physics/setDEDXBinning 220
>
> /gate/physics/setLambdaBinning 220
>
>
> /gate/physics/processList Enabled
>
> /gate/physics/processList Initialized
>
>
>
>
>
> Regards,
>
> Jinxia
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