SCINTILLATION PROPERTIES OF LU3AL5-XSCXO12 CRYSTALS

The scintillation properties of Lu3Al5-xScxO12 single garnet crystals doped with different concentrations of Sc3+ were investigated. The bes t scintillation properties were obtained for the crystal with x = 0.2 in the melt. This crystal has a broad (FWHM similar to 1 eV) ultraviol et emission band with a maximum at 275 nm. An energy resolution of 7% is observed for the 662 keV photopeak. The main decay component of the scintillation pulse has an exponential decay time of about 600 ns and accounts for 90% of the total light yield. The total scintillation li ght yield was found to be about 22500 photons/MeV. Within 10% a linear response was obtained in the energy interval from 8 keV to 1.3 MeV. T he energy resolution was found to be approximately inversely proportio nal to the square root of the excitation energy.