Evaluation of Gd2SiO5:Ce (GSO), Lu2−xGdxSiO5:Ce (LGSO), and Lu2−xYxSiO5:Ce (LYSO) Crystalline Scintillators Using a Photoacoustic Spectroscopy Technique

We evaluated the nonradiative deactivation in three scintillators, Gd 2 SiO 5 :Ce (GSO), Lu 2-x Gd x SiO 5 :Ce (LGSO), and Lu 2-x Y x SiO 5 :Ce (LYSO), using a photoacoustic spectroscopy technique (PAS). The photoacoustic (PA) spectra suggested that part of the absorption energy for the excitation of Ce 3+ will be released as heat through a nonradiative deactivation process. GSO exhibits an intense PA signal compared with LGSO and LYSO because of its energy migration process from Gd 3+ to Ce 3+ emission centers.