Conditions Extrêmes et Matériaux : Haute Température et Irradiation

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G.Patton, F.Moretti, A.Belsky, K.Al Saghir, S.Chenu, G.Matzen, M.Allix, C.Dujardin, 'Light yield sensitization by X-ray irradiation in BaAl4O7 : Eu2+ ceramic scintillator obtained by full crystallization from glass', Phys. Chem. Chem. Phys. 16 24824 (2014) doi:10.1039/c4cp04064c

We report the scintillation properties of BaAl4O7 : Eu2+, a transparent polycrystalline ceramic prepared by full and congruent crystallization from glass. We show that a small deviation from the stoichiometric composition as well as thermal treatment duration play a crucial role regarding the charge carrier traps, leading to a strong influence on the scintillation yield. We demonstrate that when the traps are not entirely removed, X-ray irradiation allows them to be permanently filled in order to significantly enhance the scintillation output. Finally, the best sample obtained demonstrates performances able to compete with a commercially available scintillating material: CsI : Tl.