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Forum: Processes Involving Optical Photons
Re: Question beginer question: NaI scintillation properties table (matthew)
Date: 17 Jan, 2011
From: Gumplinger Peter <Gumplinger Peter>

Hi Matthew,

I won't be able to exhaustively answer all of your questions but I can give you some pointers. NaI is an organic scintillator and has only one scintillation spectrum. You can call it 'fast' or 'slow' but you should define only one (it is "slow" relatively speaking).

> Does anyone have values for the necessary material properties for NaI in the

> region of 0-3MeV?

The material properties you need to simulate EM showers in NaI, the chemical composition and density, are independent of the irradiation. The index of refraction and other optical properties depend on the optical photon's energy (in the range of eV - not MeV) but may well be pretty constant over the range of the NaI's scintillation spectrum.

What you'll need are: scintillation yield, slow component (scintillation spectrum), absorption length, time constant. You can start out with the default ResolutionScale = 1 but that one depends on the purity of your particular crystal and needs to be determined by comparison with real data. Since the scintillation yield in NaI does not depend on particle type and there is only one spectrum in NaI, you don't have to concern yourself with: ScintillationYieldFactor, YIELDRATIO, FASTCOMPONENT, FASTTIMECONSTANT and SetScintillationExcitationRatio.

I am sure and I hope someone in the community can provide the NaI specifics.

Peter

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