Scintillation characteristics of nonstoichiometric phases formed in MF2-GdF3-CeF3 system - Part I. (M = Ba), Scintillation of Ba0.9Gd0.1-xCexF2.1 (0 <= x <= 0.1) fluorite-type crystals

As the Ce concentration (x) was increased from 0 to 0.1 (complete replaceme nt of Gd), the emission peak wavelength shifted from 310 (due to Gd3+ emiss ion) to 350 nm (due to Ce3+ emission). The light intensity increased from a few percent to 46% of that in BaF2. The decay constant of the dominant emi ssion approached 30-40 ns, which is characteristic of the Ce3+ luminescence . Although the radiation damage increased, its spontaneous recovery also in creased by Ce3+ doping. Phosphorescence (very slow component), which was si gnificant for x = 0 (Ce-undoped), was hardly detectable for x > 0.05. (C) 1 999 Elsevier Science B.V. All rights reserved.