Energy Transfer Mechanism in Gd2(Si04)0:Ce Scintillators
نویسنده
چکیده
The scintillation decay of cerium-doped gadolinium oxyorthosilicate Gd2(Si04)0:Ce is lengthened by the energy transfer from Gd to Ce. To investigate the role of the Gd in the scintillation processes, the Gd was partially replaced by optically inactive rare earth elements, Y and Lu, and the effective transfer rates from Gd to Ce were measured as a function of Gd and Ce concentrations using UVand gammaray excitations. The data clearly indicate the dilution of the Gd by the Y and the Lu further lengthens the migration time through the Gd in the energy transfer process from Gd to Ce.
منابع مشابه
Energy Transfer Mechanism in Gd2(Si04)0:Ce Scintillators
The scintillation decay of cerium-doped gadolinium oxyorthosilicate Gd2(Si04)0.Ce is lengthened by the energy transfer from Gd to Ce. To investigate the role of the Gd in the scintillation processes, the Gd was partially replaced by optically inactive rare earth elements, Y and Lu, and the effective transfer rates from Gd to Ce were measured as a function of Gd and Ce concentrations using Wand ...
متن کاملLight Emission Mechanism of Lu2(Si04)0:Ce
Lutetium oxyorthosilicate Lu2( S iO4)O has two crystallographically independent lutetium sites. When it is doped with Ce, the dopant Ce is assumed to occupy two different sites and thus the existence of two activation centers (called “Cel” and “Ce2”) was proposed. UV and gamma-ray excited spectra clearly indicate that two activation centers exist in cerium-doped lutetium oxyorthosilicate Lu2(Si...
متن کاملCharge carrier and exciton dynamics in LaBr3:Ce scintillators: Experiment and model
The scintillation yield and decay time of LaBr3 doped with 0.2%, 0.5%, and 5% cerium were studied between 80 K and 600 K. LaBr3 :5%Ce 3+ on a photomultiplier tube shows at 300 K a very high scintillation yield of 22 800 photoelectrons per MeV 64 000 photons per MeV with a decay time of 16 ns. At 600 K the yield decreases by 15%. The scintillation yield of LaBr3 :0.2%Ce3+ is 19 800 photoelectron...
متن کاملThe Role of Cerium Sites in the Scintillation Mechanism of LSO - Nuclear Science, IEEE Transactions on
The crystal structure of Luz(Si04)0:Ce ("LSO") has two trivalent cation sites which may be occupied by Ce3* to form luminescence centers. Previous investigations revealed the existence of two distinct sets of Ce3' excitation and emission spectra and suggested that the differences in the spectra are due to differences in the crystal fields at the two lattice sites that shift the 5d levels of Ce"...
متن کاملInvestigation of LaBr3: Ce and LaCl3: Ce scintillators for spect imaging
This study aims to investigate the potential use of LaBr3:Ce and LaCl3:Ce materials in SPECT imaging. GATE Monte Carlo simulations of single-head gamma camera and a Tc point source were performed to evaluate the energy spectra, modulation transfer function (MTF) and detection efficiency. A range of Ce concentrations (0.5, 5, 10 and 15)% of LaBr3:Ce and LaCl3:Ce crystals was simulated in conjunc...
متن کامل