Two- and Three-Layered Composite Scintillators Based on the Ce3+- Doped GAGG and TbAG Garnets for the Simultaneous Registration of Various Types of Ionizing Radiation

This work presents our most recent results in the development of composite scintillators using Liquid Phase Epitaxy growth method, based on the single crystalline films and single crystals of garnet compounds for radiation monitoring of different components of mixed ionization radiation fluxes. Such composite scintillators present two and three layered epitaxial structures consisting of two single crystalline films of Ce3+ doped garnets, namely Gd3Al5-xGaxO12:Ce garnet with Ga content x=1.75–2.25 as a first film layer and Tb3Al5O12:Ce garnet as a second film layer. As substrates, the Gd3Al5-xGaxO12:Ce single crystals with fixed Ga concentration x=2.3, 2.5 and 3.0 were used. For estimation of scintillation properties of the respective epitaxial structures (pulse height spectra, light yield and scintillation decay kinetics) we have used three types of ionizing radiation: α–particles (239Pu), β-particles (90Sr + 90Y) and γ–quanta (137Cs).