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<DIV>Hi Pedro Correia,</DIV>
<DIV> </DIV>
<DIV>I am not sure whether you can define the reflective surface between LYSO
and box3 whose relationship is mother and daughter. Anyone knows it?</DIV>
<DIV> </DIV>
<DIV>Usually, five volumes representing the reflector would be defined in your
case, so you can specify the surface formed by MPPC and LYSO seperately.</DIV>
<DIV> </DIV>Thanks,
<HR style="HEIGHT: 1px; WIDTH: 0px" align=left color=#b5c4df SIZE=1>
<DIV><SPAN></SPAN></DIV>
<DIV>Han</DIV>
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<DIV><B>From:</B> <A href="mailto:pmcorreia@ua.pt">Pedro Correia</A></DIV>
<DIV><B>Date:</B> 2014-04-09 17:36</DIV>
<DIV><B>To:</B> <A
href="mailto:gate-users@lists.opengatecollaboration.org"><gate-users@lists.opengatecollaboration.org></A></DIV>
<DIV><B>Subject:</B> [Gate-users] LYSO surfaces painted with reflective
ink</DIV></DIV></DIV>
<DIV>
<DIV>Dear Gate users</DIV>
<DIV> </DIV>
<DIV>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. </DIV>
<DIV> </DIV>
<DIV>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.</DIV>
<DIV> </DIV>
<DIV>Do you have any suggestion to solve this?</DIV>
<DIV> </DIV>
<DIV>The code that I’m using is:</DIV>
<DIV> </DIV>
<DIV># C R Y S T A L</DIV>
<DIV>/gate/box2/daughters/name box3</DIV>
<DIV>/gate/box2/daughters/insert box</DIV>
<DIV>/gate/box3/geometry/setXLength 21. mm</DIV>
<DIV>/gate/box3/geometry/setYLength 1.5 mm</DIV>
<DIV>/gate/box3/geometry/setZLength 1.5 mm</DIV>
<DIV>/gate/box3/setMaterial Air</DIV>
<DIV>/gate/box3/vis/forceWireframe</DIV>
<DIV> </DIV>
<DIV> </DIV>
<DIV># L A Y E R LYSO</DIV>
<DIV>/gate/box3/daughters/name LYSO</DIV>
<DIV>/gate/box3/daughters/insert box</DIV>
<DIV>/gate/LYSO/geometry/setXLength 20. mm</DIV>
<DIV>/gate/LYSO/geometry/setYLength 1.5 mm</DIV>
<DIV>/gate/LYSO/geometry/setZLength 1.5 mm</DIV>
<DIV>/gate/LYSO/placement/setTranslation -0.5 0 0 mm</DIV>
<DIV>/gate/LYSO/setMaterial LYSO</DIV>
<DIV>/gate/LYSO/vis/setColor green</DIV>
<DIV>/gate/LYSO/vis/forceWireframe</DIV>
<DIV>#/gate/LSO/vis/forceSolid</DIV>
<DIV> </DIV>
<DIV># L A Y E R MPPC for photon
collection</DIV>
<DIV>/gate/box3/daughters/name mppc</DIV>
<DIV>/gate/box3/daughters/insert box</DIV>
<DIV>/gate/mppc/geometry/setXLength 1. mm</DIV>
<DIV>/gate/mppc/geometry/setYLength 1.5 mm</DIV>
<DIV>/gate/mppc/geometry/setZLength 1.5 mm</DIV>
<DIV>/gate/mppc/placement/setTranslation 10. 0 0 mm</DIV>
<DIV>/gate/mppc/setMaterial Air</DIV>
<DIV>/gate/mppc/vis/setColor cyan</DIV>
<DIV>/gate/mppc/vis/forceWireframe</DIV>
<DIV> </DIV>
<DIV>#Surface conditions </DIV>
<DIV>/gate/LYSO/surfaces/name cristal_surf1</DIV>
<DIV>/gate/LYSO/surfaces/insert box3</DIV>
<DIV>/gate/LYSO/surfaces/cristal_surf1/setSurface rough_reflector</DIV>
<DIV> </DIV>
<DIV>and in the Surfaces.xml file, the rough_reflector is defined as</DIV>
<DIV> </DIV>
<DIV> <surface name="rough_reflector" type="dielectric_dielectric"
sigmaalpha="6.0"\</DIV>
<DIV>finish="groundbackpainted"></DIV>
<DIV> <propertiestable></DIV>
<DIV> <propertyvector
name="SPECULARLOBECONSTANT" energyunit="eV"></DIV>
<DIV> <ve energy="1.84"
value="1"/></DIV>
<DIV> <ve energy="4.08"
value="1"/></DIV>
<DIV> </propertyvector></DIV>
<DIV> <propertyvector
name="SPECULARSPIKECONSTANT" energyunit="eV"></DIV>
<DIV> <ve energy="1.84"
value="0"/></DIV>
<DIV> <ve energy="4.08"
value="0"/></DIV>
<DIV> </propertyvector></DIV>
<DIV> <propertyvector
name="BACKSCATTERCONSTANT" energyunit="eV"></DIV>
<DIV> <ve energy="1.84"
value="0"/></DIV>
<DIV> <ve energy="4.08"
value="0"/></DIV>
<DIV> </propertyvector></DIV>
<DIV> <propertyvector name="EFFICIENCY"
energyunit="eV"></DIV>
<DIV> <ve energy="1.84"
value="0"/></DIV>
<DIV> <ve energy="4.08"
value="0"/></DIV>
<DIV> </propertyvector></DIV>
<DIV> <propertyvector name="REFLECTIVITY"
energyunit="eV"></DIV>
<DIV> <ve energy="1.84"
value="0.99"/></DIV>
<DIV> <ve energy="4.08"
value="0.99"/></DIV>
<DIV> </propertyvector></DIV>
<DIV> <propertyvector name="RINDEX"
energyunit="eV"></DIV>
<DIV> <ve energy="1.84"
value="1.55"/></DIV>
<DIV> <ve energy="4.08"
value="1.55"/></DIV>
<DIV> </propertyvector></DIV>
<DIV> </propertiestable></DIV>
<DIV> </surface></DIV>
<DIV> </DIV>
<DIV>Many thanks.</DIV>
<DIV> </DIV>
<DIV>Best regards, Pedro Correia</DIV>
<DIV>PhD Student at University of Aveiro</DIV>
<DIV> </DIV>
<DIV>_______________________________________________</DIV>
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