[Gate-users] Lumirror reflector - Optical surface in GATE

[Francisco Enríquez]

Dear Gate users,

First of all, I hope that everything is ok for you and your relatives regarding the current situation.

I’m trying to simulate a PET detector module comprised of pixelated LYSO crystals that in real life are optically isolated through a Lumirror reflector tape.
According to the GATE users guide there’re two models available in GATE for optical surface definition: LUT Davis and UNIFIED.

  *   LUT Davis is not a general model and, unfortunately, it does not include the Lumirror surface definition
  *   UNIFIED requires the definition of several optical properties that are not always easy to obtain or measure (which is my case right now)

Also, it’s worth to say that in GEANT4 (G4RealSurface.2.1.1) there is another LUT, called Reflectance LUT, (from Janecek and Moses) in which more optical surfaces are defined, and which includes the Lumirror surface.
Right now I’m using GATE v8.2, which is compiled with the G4RealSurface.2.1.1, so for me seemed logical to think that the Reflectance LUT should also work with GATE. Though, when I checked the information stored in these data files, I discovered that they are all filled with zeros!

Based on all the above I have the next question:

  1.  Is it correct to suppose that GATE should run using the Reflectance LUT? If the answer is yes, why all these data files are filled with zeros?
  2.  If anyone has previously simulated the Lumirror reflector tape with GATE, using the UNIFIED model, would that person be so gently to help me?


Regards,
Francisco


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