[Gate-users] Radioluminescence phenomenon

DEGRELLE, Deborah deborah.degrelle at veolia.com
Thu Aug 13 17:22:16 CEST 2020

Dear GATE users,

I am trying to make a simulation of the radioluminescence phenomenon when
alpha particles cross the air.

Alpha particles make ionisations into the air and produce électrons. These
electrons must interact with the dinitrogen molecules of the air to create
UV photons with a known UV spectrum.

In the physics part of my macro, I use :

# ** electron interaction
/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-

# ** alpha interaction
/gate/physics/addProcess IonIonisation
/gate/physics/addProcess hMultipleScattering alpha

# ** Optical photons
/gate/physics/addProcess OpticalAbsorption
/gate/physics/addProcess OpticalRayleigh
/gate/physics/addProcess OpticalBoundary
/gate/physics/addProcess OpticalMie
/gate/physics/addProcess OpticalWLS
/gate/physics/addProcess Scintillation

In the Materials.xml file, I add the WLS features in the material "air"

<propertyvector name="RINDEX" energyunit="eV">
        <ve energy="1.84" value="1.000277"/>
        <ve energy="6.2" value="1.000277"/>
      <propertyvector name="WLSABSLENGTH" unit="cm" energyunit="eV">
      <ve energy="0" value="0"/>
      <ve energy="4" value="0"/>
      <propertyvector name="WLSCOMPONENT" energyunit="eV">
      <ve energy="3.05"  value="0.007"/>
      <ve energy="3.25"  value="0.022"/>
      <ve energy="3.47"  value="0.067"/>
      <ve energy="3.68"  value="0.1"/>
      <ve energy="3.92"  value="0.067"/>
      <ve energy="4.16"  value="0.012"/>
      <ve energy="4.39"  value="0.005"/>
      <ve energy="4.61"  value="0.0005"/>
      <property name="WLSTIMECONSTANT" value="0.1" unit="ns"/>

The method I used didn't work. No UV photons were emitted. Where am I wrong
? Have you ever made this kind of simulation ?

Thank you for your help.


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