Scintillation crystals of CaI2 and CaI2(Eu) have been produced which iypically show pulse heights of 180% relative to NaI(Tl). The emission spectra for both pure and activated materials are well matched to a S-ll phototube response. Pure CaI2 has a decay time of 0.55, μsec; CaI2(Eu) has a 0.79, μsec decay time. Though this material is difficult to grow and to package, performance results thus far obtained are encouraging.
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Hofstadter et al. (1964) studied this question.