Abstract
This paper studies the scintillation process in CsI:Eu crystal exposed to the pulse electron irradiation (E=0.25MeV, t1/2=15ns and W=0.003J/cm2). It has been proved that the energy transfer from the lattice to Eu2+ ions in CsI:Eu occurs through the re-absorption of STE emission. The proposed model rests on the following experimental facts: (1) the activator emission at 2.68eV rises gradually after the decay of the excitation pulse even at temperature lower than 90K when Vk centers are immobile; (2) the rise time of 2.68eV emission and the decay time of STE emission have the same temperature dependences at T=78–300K; (3) the excitation spectrum of 2.68eV emission overlaps the emission spectrum of STE.
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