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Nuclear and high energy physics research has a need for new, high performancescintillators with high light yields; high densities, fast decay times, and areradiation hard. In this paper we present crystal growth and results from 16-mmdiameter cerium (Ce)-doped Tl2LaCl5 (TLC) and europium (Eu)-doped TlCa2Br5(TCB)as well as one-inch diameter cerium-doped Tl2GdBr5 (TGB) andeuropium-dopedTlSr2I5 (TSI), each grown in a two-zone vertical furnace by themodified Bridgman method. Samples extracted and processed from the grown bouleare characterized for their scintillation properties like energy resolution,light yield, decay time and non-proportionality.Energy resolution (FWHM) at 662keV of 5.1%, 3.4%, 4.0%, and 3.3% are obtained for samples of TGB, TLC, TCB,and TSI, respectively. Ce-doped TGB and TLC have single decay time componentsof 26 ns and 48 ns, respectively, while Eu-doped TCB and TSI have long decaytimes with primary decay constants of 571 ns and 630 ns. These compoundsexhibit good proportionality behavior when compared toNaI:Tl and BGO.

Advancements in High Density and Fast Scintillation Detector Materials