Abstract
In this study, a Eu-doped Li2SrCl4/LiSr2Cl5 eutectic with a high 6Li concentration was developed as a novel thermal neutron scintillator. The doped Eu served as an activator in the Li2SrCl4 and LiSr2Cl5 phases. The Eu-doped Li2SrCl4/LiSr2Cl5 eutectic was grown using the vertical Bridgman method in a sealed quartz ampoule. The eutectic exhibited a lamellar eutectic structure elongated along the pulling direction, and was optically transparent. The emissions at 401 and 412 nm were attributed to the Eu2+ 4f-5d transition in the Li2SrCl4 and LiSr2Cl5 phases, respectively. The light yield under 5.5 MeV α -rays was estimated to be 5,600 photons/5.5 MeV α -rays. The scintillation decay time was 312 ns. In the eutectic, the Li2SrCl4 and LiSr2Cl5 phases contributed to scintillation and neutron capture by the 6Li (n, a) 3H reaction.
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