|Message: Re: NaI scintillator||Not Logged In (login)|
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1) ScintilSlow and ScintilFast correspond to the fast and slow decay times of the scintillator. If you are not concerned with timing, then you don't need to use them both, but they won't hurt so you might as well leave them in there.
If you wanted force all of your photons to come in with the fast or slow time constant, you could play with the yield ratio and set it to 1.0 or 0.0. ex) myMPT1->AddConstProperty("YIELDRATIO",1.0);
2) You do not need to actually wrap the scintillator with Al in order to alter the surface properties of the scintillator with respect to optical photons. Specifying a dielectric-metal surface between the NaI and ExpHall is sufficient for the effect of optical photons. However, this solution would not take into account any attenuation that other particles, say x-rays, would experience by the aluminium.