<div dir="ltr">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]) <img width="358" height="245" id="gmail-图片_x0020_3" src="http://mail.126.com/js5/s?func=mbox:getMessageData&sid=aAZTfwjOLSXPrJsDMpOOQQhQcSixSmta&mid=206:1tbizhRo7VWmO8s-IAAAsD&part=5" style="border: 0px;"> <img width="392" height="243" id="gmail-图片_x0020_1" src="http://mail.126.com/js5/s?func=mbox:getMessageData&sid=aAZTfwjOLSXPrJsDMpOOQQhQcSixSmta&mid=206:1tbizhRo7VWmO8s-IAAAsD&part=9" style="border: 0px; margin-right: 0px;"> (3) fastY90 source (energy window: [0, inf]) (4) ion source (energy window:[0, inf]) <img width="417" height="254" id="gmail-图片_x0020_2" src="http://mail.126.com/js5/s?func=mbox:getMessageData&sid=aAZTfwjOLSXPrJsDMpOOQQhQcSixSmta&mid=206:1tbizhRo7VWmO8s-IAAAsD&part=4" style="border: 0px; margin-right: 0px;"> <img width="354" height="261" id="gmail-_x0000_i1031" src="http://mail.126.com/js5/s?func=mbox:getMessageData&sid=aAZTfwjOLSXPrJsDMpOOQQhQcSixSmta&mid=206:1tbizhRo7VWmO8s-IAAAsD&part=3" style="border: 0px; margin-right: 0px;"> （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</div>