Author :
Guillot-Noël, O. ; van´t Spijker, J.C. ; de Haas, J.T.M. ; Dorenbos, P. ; van Eijk, C.W.E. ; Krämer, K.W. ; Güdel, H.U.
Abstract :
The scintillation properties of RbGd2Br7 crystals, doped with Ce3+ concentrations of 0.02, 0.11, 0.88, 2.05, 4.1, and 9.8%, are studied under X-ray and γ-quanta excitations. For the RbGd2Br7 sample doped with 9.8% Ce, the authors measured a light yield of 56000±6000 photons per MeV of absorbed γ-ray energy with a main decay time of 43±1 ns, using a Hamamatsu R1791 photomultiplier (PMT), a 137Cs radioactive source, and a shaping time of 10 μs. A time resolution of 790±10 ps was measured for the RbGd2Br7:9.8% Ce compound, using BaF2 as second scintillator, two XP2020Q PMTs, a 22Na source, and an energy threshold set at E⩾511 keV. With the R1791 PMT, an energy resolution of 4.1% (FWHM over peak position) for the 662-keV full absorption peak has been observed for two crystals of 7×4×2 mm3 and 15×5×1 mm3 with 4.1 and 9.8% Ce content, respectively. Moreover, the nonproportional responses of three RbGd2Br7:Ce compounds with different concentrations (0.11, 2.05, and 9.8%) were studied revealing an almost-constant light output response from 17.4 keV to 1 MeV. These properties are compared to three other well-known scintillators: NaI:Tl, CsI:Tl, and Lu2SiO5:Ce
Keywords :
cerium; photoluminescence; rubidium compounds; solid scintillation detectors; γ-ray; 17.4 keV to 1 MeV; 662 keV; 790 ps; BaF2; Ce3+ concentration; CsI:Tl; Hamamatsu R1791 photomultiplier; Lu2SiO5:Ce; NaI:Tl; RbGd2Br7:Ce; X-ray; energy resolution; light output response; nonproportional response; shaping time; time resolution; Absorption; Atomic measurements; Chemical technology; Doping; Energy measurement; Energy resolution; Inductors; Photonic crystals; Solid scintillation detectors; Time measurement;
