[Gate-users] 64 Cu positron spectra problem

[Matthew Strugari]

Hi Zhengzhi and Tien-Phong,

Please refer to https://opengate.readthedocs.io/en/latest/setting_up_the_physics.html# for information on physics list. The implementation suggested by Zhengzhi is being deprecated and should not be used. Rather, use the physics list builder mechanism:
/gate/physics/addPhysicsList emstandard_opt4
/gate/physics/addProcess RadioactiveDecay
You may replace emstandard_opt4 with the physics list builder most suitable for your needs (see http://geant4-userdoc.web.cern.ch/geant4-userdoc/UsersGuides/PhysicsListGuide/html/index.html for more info on physics lists.) Also, the following line may be required with your source definition to ensure that your Cu-64 source has no kinetic energy:
/gate/source/pointSource/gps/energy 0 MeV

Regards,
Matthew

________________________________
From: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> on behalf of Zhengzhi Liu <zliu36 at stanford.edu>
Sent: March 2, 2020 1:22 PM
To: Tien-Phong PHAM <tienphong.pham at laposte.net>
Cc: gate-users <gate-users at lists.opengatecollaboration.org>
Subject: Re: [Gate-users] 64 Cu positron spectra problem

Hi Tien-Phong,

Below is my physics.mac Could you compare this with yours? You might have missed something in your physics.mac.

Good luck,
Zhengzhi



#-------------------oooooOOOOO00000OOOOOooooo---------------------#
#                                                                 #
#             P H Y S I C A L   P R O C E S S E S                 #
#                                                                 #
#-------------------oooooOOOOO00000OOOOOooooo---------------------#

/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 eMultipleScattering e+
/gate/physics/addProcess eMultipleScattering e-

/gate/physics/processList Enabled
/gate/physics/processList Initialized

/gate/physics/addProcess IonIonisation
/gate/physics/addProcess RadioactiveDecay

On Mon, Mar 2, 2020 at 6:15 AM Tien-Phong PHAM <tienphong.pham at laposte.net<mailto:tienphong.pham at laposte.net>> wrote:

Dear Gate-users,

I’m trying to simulate the energy spectrum of a Cu-64 source using the ion definition in GATE v8.2, but i have a problem with the positron emission spectra. In fact, the energy distribution with my ion source is very different with spectral definition in the low energy region. I mean the energy spectrum of positron is similar to the energy spectrum of electron.

In this case, i just used the « RadioactiveDecay » as physics list

I would like to ask if someone has experience with ion type source can help me.

Many thanks for your help ![cid:1709c433b969093c11c1]

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