Comparative Study of Optical and Scintillation Responses of Sr_3NbGa_3Si_2O_(14) (SNGS) and La_3Ta_(0.5)Ga_(5.3)Al_(0.2)O_(14) (LTGA) Crystals

摘要

Optical and scintillation properties of Sr_3NbGa_3Si_2O_(14) (SNGS) single crystal were evaluated for the first time and compared with those of La_3Ta_(0.5)Ga_(5.3)Al_(0.2)O_(14) (LTGA), which was previously reported to exhibit such properties. SNGS showed ～80% optical transmittance at wavelengths longer than 250 run. Under 250 run excitation, a strong photoluminescence (PL) appeared at 400 nm with a primary decay time of 1.4 ns. In an X-ray-induced radioluminescence spectrum, an intense emission peak at 400 run was observed, and the primary scintillation decay time was ～1.37 μs. Finally, the absolute scintillation light yield of SNGS turned out to be 850 photons/MeV, which was higher than that of LTGA.