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In this paper, we investigated the scintillation properties of LuI3:Ce3+. Radioluminescence, light output, energy resolution, and γ-scintillation decay are reported. We find an extremely high light output of 98 000±10 000 photons/MeV. LuI3:Ce3+ also gives a very high electron-hole (e-h) pair response when it is coupled with an avalanche photodiode (APD) (92 000±9000 e-h pairs/MeV). With an APD, a best energy resolution (full width at half maximum over the peak position) of 3.3%±0.3% for 662 keV γ quanta is observed. A combination of an extremely high light output and a good energy resolution makes LuI3:Ce3+ an ideal scintillator for radiation sensor applications. Some drawbacks due to the hygroscopicity and the difficult growth of LuI3:Ce3+ crystals are also discussed. [ABSTRACT FROM AUTHOR]

The scintillation properties of the first large Ø0 1 × 1 inch³ LaBr3:5%Ce3+ scintillator were studied under γ-ray excitation. This crystal is a LaBr3:5%Ce3+ standard product from Saint Gobain company. The sample was cut and polished by the manufacturer from a larger size crystal boule. It was then assembled in a cylindric aluminum case with a front glass window. The results are compared with those recorded with a 0.4 × 0.3\, × 0.5 inch³ unpacked crystal. The highest light yield of 21500 ± 2200 photoelectrons per MeV (60500 ± 6000 photons per MeV) of absorbed γ-ray energy was measured for the unpacked crystal—compared to 16800 ± 1700 photoelectrons per MeV for the Ø1 × 1 inch³ sample. At room temperature the scintillation decays with a decay time of 16 ± 1 ns. The 0.4 × 0.3 × 0.5 inch³ unpacked crystal-coupled to photomultiplier tube (Hamamatsu R1791) and measured at 662 keV-exhibited an energy resolution of 2.8%, better than the one of the Ø1 × 1 inch³ crystal (3.1%). Special attention was devoted to energy and temperature dependencies of scintillation properties: the results show a good proportionality for light output versus γ-ray energy. The light output deviates from the linear response of 5% between 20 keV and 2 MeV. Furthermore temperature dependency of gamma-ray excited decay time (80-700 K) does not indicate the presence of thermal quenching from the cerium 5d state. These characteristics suggest a broad range of applications for the LaBr3:5%Ce3+ scintillator. [ABSTRACT FROM AUTHOR]

Optical quality Gd2O2S:Tb,Ce ceramics have been sintered by the uniaxial hot pressing method. The heat-treated ceramics offer high transparency in a wide spectral range from 400 to 1000 nm and good scintillation characteristics: high intensity of X-ray stimulated luminescence in the green spectral region and a low level of afterglow [ABSTRACT FROM PUBLISHER]

The scintillation properties of LuI3:Ce3+ (pure, 0.5%, 2%, and 5% Ce3+), a new member of the generation of Ce3+ doped lanthanide trihailde scintillators, are presented. This material has a calculated density of 5.6 g/cm³ and an atomic number Zeff of 60.2. Under optical and X-ray excitation, Ce3+ emission is observed to peak at 472 and 535 nm. A high light yield of 76 000 photons per MeV (ph/MeV) was measured for LuI3:2% Ce3+. LuI3:Ce3+ has a nonexponential decay time. The contribution of short decay components (within 50 ns) to the total light yield is around 50%. An energy resolution (full-width half maximum over peak position) for the 662 keV full energy peak of 4.7 ± 0.5% was observed for LuI3:0.5% Ce3+. [ABSTRACT FROM AUTHOR]

Discusses the attempts to improve LuAlO3:Ce3+ systems, which have shown to be `promising' scintillators for medical imaging devices. Factors which were measured; Reference to Positron Emission Tomography; How cerium-doped lutetium orthoaluminate crystals were grown; Information on light yield measurements under gamma-ray excitation.

In this paper, we investigated the scintillation properties of LuI3:Ce3+. Radioluminescence, light output, energy resolution, and γ-scintillation decay are reported. We find an extremely high light output of 98 000±10 000 photons/MeV. LuI3:Ce3+ also gives a very high electron-hole (e-h) pair response when it is coupled with an avalanche photodiode (APD) (92 000±9000 e-h pairs/MeV). With an APD, a best energy resolution (full width at half maximum over the peak position) of 3.3%±0.3% for 662 keV γ quanta is observed. A combination of an extremely high light output and a good energy resolution makes LuI3:Ce3+ an ideal scintillator for radiation sensor applications. Some drawbacks due to the hygroscopicity and the difficult growth of LuI3:Ce3+ crystals are also discussed. [ABSTRACT FROM AUTHOR]

The scintillation properties of LaBr[sub 3] doped with 0.5% Ce[sup 3+] are presented. Under optical and gamma ray excitation, Ce[sup 3+] emission is observed to peak at 356 and 387 nm. The scintillation light output is 61 000±5000 photons/MeV at 662 keV. More than 90% is emitted with a decay time of 35 ns. An energy resolution (full width at half maximum over the peak position) of 2.85%±0.05% was observed for the 662 keV full absorption peak. A time resolution of 385 ps was obtained using BaF[sub 2] as second scintillator and gamma rays of [sup 60]Co. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR]

The scintillation properties of LaCl[sub 3] doped with 10% Ce[sup 3+] are presented. Under optical and gamma ray excitation, Ce[sup 3+] emission is observed to peak at 330 and 352 nm. The scintillation light output is 46 000±1000 photons/MeV at 662 keV. Forty percent is emitted with a decay time of 26 ns, 30% with 210 ns, and 30% with about 1000 ns. An energy resolution (full width at half maximum over the peak position) of 3.3±0.3% was observed for the 662 keV full absorption peak. © 2000 American Institute of Physics. [ABSTRACT FROM AUTHOR]