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Question Crosstalk between scintillators 

Forum: Processes Involving Optical Photons
Date: 18 May, 2014
From: <Cab>

I am interested in light collect simulations in scintillation crystals similar for PET application without the coincidence aspect of the modality. The setup I would like to simulate is the following :

1) 32 parallelepiped (1x1x12 mm≥) LSO or LYSO scintillation crystals arranged in a 4x8 array

2) The crystals are wrapped with a reflector (e.g. ESR from 3M company) sputtered with aluminum

3) 511 keV gammas are impinging on the matrix - the gammas can produce scintillation light (the crystal emits optical photons following the LSO or LYSO spectrum)

4) Caracterisation of the crosstalk between adjacent crystals

5) Study of the light output

I am aware of the lookup tables for real surface (Paper by Janecek in 2010), which are pretty good to use as description of reflectors, but is it possible to integrate aluminum layer on top of reflectors easily?

Also, since ESR is a multilayer structure which deploys interference effects to generate good reflectivity, I think I cannot model it with any light ray tracing simulator since it calculates the transmission and reflection values for each interface consecutively and therefore is not able to take interference effects of a whole stack into account, right? Would there be a way to do that with Geant4 or some other Monte-Carlo 3D program?

At first, I would like to begin with a single wrapped crystal to study light collect. I've read a lot of documentation about Geant4, but I just want to be sure that the type of simulations I would like to do are feasible, and if some similar examples are available.

Thank you very much in advance for any help!

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