[Gate-users] Wavelength-shifting (WLS) fibres coupled to scintillators

[Filipe Castro]

Hi everyone,

I want to simulate scintillation photons produced by 511 keV gammas and their optical path through a LYSO scintillator with mirror polished ends and reflective side surfaces. One end of the crystal is coupled to a wavelength-shifting fibre (double-cladded BCF-91A fibre), such that crystal and fibre make a 90 degree angle.
As I am not experienced with Gate (using vGate 2.1), I have many doubts regarding the proper physics and geometry necessary for the simulation, namely of the optical photons path, optical boundaries and fibre geometry. Is there anyone who has simulated similar experiments with this kind of fibres, for example in the AxPET project, who can help me out?
I've already recompiled Gate with optical ON.

In order to define the reflective surfaces of the crystal, do I need to first define the volumes with the reflective material or is it possible to define the surfaces only with the crystal volume?

Is it necessary to define separate volumes with the different materials of the fibre (core, first clad and 2nd clad)? In this case, it is a square fibre, so what would be the best way to do it?

Are these physics processes enough: Scintillation, PhotoElectric, Compton, GammaConversion, OpticalAbsorption, OpticalWLS, OpticalBoundary ?

I appreciate any help in answering these questions or giving any further enlightment :)

Thanks!

Filipe Castro

University of Aveiro
Physics Department & i3n
DRIM - Radiation Detection and Medical Imaging
ifcastro at ua.pt<mailto:ifcastro at ua.pt>
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