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Sorry, for the delay in replying to your first question. It comes with the season.
To simulate optical photons, you the users, must provide optical properties such as the index of refraction (RIND) and the bulk absorption length (ABSL) for each dielectric material. You provide this information as a function of wavelength, or rather optical photon momentum (PP). At how many bins (NUMENTRIES) you provide these is up to you but it must be at least 2.
When you simulate scintillation, you again have to provide the wavelength (momentum) spectrum of the emitted photons. This can be a relative strength (SCINT).
Yes, it is necessary to give the index of refraction and absorption lenght for every dielectric material in your simulation, or else G4 assumes it is an opaque metal.
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