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Structural and Scintillation Properties of Cerium-Doped {\rm Ba}_{{}_{1- \rm x}}{\rm La}_{{}_{\rm x}}{\rm Cl}_{{}_{2+ \rm x }} Ceramics

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5 Author(s)
Edgar, A. ; Sch. of Chem. & Phys. Sci., Victoria Univ., Wellington ; Bartle, M. ; Raymond, S.G. ; Williams, Grant V.M.
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A series of cerium-doped compounds with the composition Ba1-xLaxCl2+x and 0 < x < 0.5 have been prepared in ceramic form. We find from the powder X-ray diffraction patterns that the compounds adopt the cubic fluorite structure for 0.05 < x 0.34. Samples with x~ 0.2 are translucent. When doped with trivalent cerium, the materials show photoluminescence emission peaks at 350, 372 nm (for the Ba0.66La0.34Cl2.34 composition); the photoluminescence decay can be fitted with a single exponential with decay time 25 ns. The scintillation pulse height analysis shows a photopeak 137Cs for which can be used to compute a light yield of 4000 photons/MeV. The scintillation decay is non-exponential, with a rapid initial decay which can be represented approximately by a decay constant of ~100 ns, but there is a substantial delayed scintillation which extends over several microseconds.

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Nuclear Science, IEEE Transactions on  (Volume:55 ,  Issue: 3 )