[Gate-users] LYSO surfaces painted with reflective ink

[Jenny Nilsson]

Hello all.

No, if you want to have a LYSO crystal with a reflective ink layer and outside the ink there is an air volume, then you need to define a LYSO volume and then an air volume. The reflective ink properties are defined in Surfaces.xml.

Best regards
Jenny



9 apr 2014 kl. 12:18 skrev Pedro Correia <pmcorreia at ua.pt<mailto:pmcorreia at ua.pt>>:

Hello Han

So I need to manually define, lets say, a thin volume of ink placed in each one of the surfaces that I want to be reflective?

Best regards, Pedro


No dia 09/04/2014, às 10:52, dme627b at gmail.com<mailto:dme627b at gmail.com> escreveu:

Hi Pedro Correia,

I am not sure whether you can define the reflective surface between LYSO and box3 whose relationship is mother and daughter. Anyone knows it?

Usually, five volumes representing the reflector would be defined in your case, so you can specify the surface formed by MPPC and LYSO seperately.

Thanks,
________________________________
Han
From: Pedro Correia<mailto:pmcorreia at ua.pt>
Date: 2014-04-09 17:36
To: <gate-users at lists.opengatecollaboration.org><mailto:gate-users at lists.opengatecollaboration.org>
Subject: [Gate-users] LYSO surfaces painted with reflective ink
Dear Gate users

I’m trying to simulate a PET system, with some LYSO crystals as scintillators. In our experimental setup, we paint the LYSO lateral faces, with reflective ink, in order to reduce the optical photon escape.

At this point, I’m reproducing this at GATE using rough reflective surfaces in the Surfaces.xml file, between the faces of the LYSO crystal and the external volume. But I only want to paint the lateral faces, and when I use the code bellow, all the faces of the LYSO became reflective, and I’m not able to collect the photons in the electronic photomultipliers located at the tops of the LYSO.

Do you have any suggestion to solve this?

The code that I’m using is:

#       C R Y S T A L
/gate/box2/daughters/name box3
/gate/box2/daughters/insert box
/gate/box3/geometry/setXLength 21. mm
/gate/box3/geometry/setYLength 1.5 mm
/gate/box3/geometry/setZLength 1.5 mm
/gate/box3/setMaterial Air
/gate/box3/vis/forceWireframe


#       L A Y E R LYSO
/gate/box3/daughters/name LYSO
/gate/box3/daughters/insert box
/gate/LYSO/geometry/setXLength 20. mm
/gate/LYSO/geometry/setYLength 1.5 mm
/gate/LYSO/geometry/setZLength 1.5 mm
/gate/LYSO/placement/setTranslation -0.5 0 0 mm
/gate/LYSO/setMaterial LYSO
/gate/LYSO/vis/setColor green
/gate/LYSO/vis/forceWireframe
#/gate/LSO/vis/forceSolid

#       L A Y E R MPPC for photon collection
/gate/box3/daughters/name mppc
/gate/box3/daughters/insert box
/gate/mppc/geometry/setXLength  1. mm
/gate/mppc/geometry/setYLength  1.5 mm
/gate/mppc/geometry/setZLength  1.5 mm
/gate/mppc/placement/setTranslation 10. 0 0 mm
/gate/mppc/setMaterial Air
/gate/mppc/vis/setColor cyan
/gate/mppc/vis/forceWireframe

#Surface conditions
/gate/LYSO/surfaces/name   cristal_surf1
/gate/LYSO/surfaces/insert box3
/gate/LYSO/surfaces/cristal_surf1/setSurface rough_reflector

and in the Surfaces.xml file, the rough_reflector is defined as

  <surface name="rough_reflector" type="dielectric_dielectric" sigmaalpha="6.0"\
finish="groundbackpainted">
    <propertiestable>
      <propertyvector name="SPECULARLOBECONSTANT" energyunit="eV">
        <ve energy="1.84" value="1"/>
        <ve energy="4.08" value="1"/>
      </propertyvector>
      <propertyvector name="SPECULARSPIKECONSTANT" energyunit="eV">
        <ve energy="1.84" value="0"/>
        <ve energy="4.08" value="0"/>
      </propertyvector>
      <propertyvector name="BACKSCATTERCONSTANT" energyunit="eV">
        <ve energy="1.84" value="0"/>
        <ve energy="4.08" value="0"/>
      </propertyvector>
      <propertyvector name="EFFICIENCY" energyunit="eV">
        <ve energy="1.84" value="0"/>
        <ve energy="4.08" value="0"/>
      </propertyvector>
    <propertyvector name="REFLECTIVITY" energyunit="eV">
        <ve energy="1.84" value="0.99"/>
        <ve energy="4.08" value="0.99"/>
      </propertyvector>
      <propertyvector name="RINDEX" energyunit="eV">
        <ve energy="1.84" value="1.55"/>
        <ve energy="4.08" value="1.55"/>
      </propertyvector>
    </propertiestable>
  </surface>

Many thanks.

Best regards, Pedro Correia
PhD Student at University of Aveiro

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