This manuscript summarizes recent results on the development of composite luminescent materials based on the single-crystalline films and single crystals of simple and mixed garnet compounds obtained by the liquid-phase epitaxy growth method. Such composite materials can be applied as scintillating and thermoluminescent (TL) detectors for radiation monitoring of mixed ionization fluxes, as well as scintillation screens in the microimaging techniques. The film and crystal parts of composite detectors were fabricated from efficient scintillation/TL materials based on Ce3+-, Pr3+-, and Sc3+-doped Lu3Al5O12 garnets, as well as Ce3+-doped Gd3-xAxAl5-yGayO12 mixed garnets, where A = Lu or Tb; x = 0-1; y = 2-3 with significantly different scintillation decay or positions of the main peaks in their TL glow curves. This work also summarizes the results of optical study of films, crystals, and epitaxial structures of these garnet compounds using absorption, cathodoluminescence, and photoluminescence. The scintillation and TL properties of the developed materials under α- and β-particles and γ-quanta excitations were studied as well. The most efficient variants of the composite scintillation and TL detectors for monitoring of composition of mixed beams of ionizing radiation were selected based on the results of this complex study.

Centre of Excellence ENSEMBLE3 Sp z o o ul Wolczynska 133 01 919 Warsaw Poland

Institute for Materials Research Tohoku University 2 1 1 Katahira Aoba ku Sendai 980 8577 Japan

Institute for Scintillation Materials National Academy of Sciences of Ukraine 61072 Kharkiv Ukraine

Institute of Nuclear Physics Polish Academy of Sciences 31 342 Krakow Poland

Institute of Physics Academy of Sciences of Czech Republic Cukrovarnicka Stress 10 16200 Prague Czech Republic

Institute of Physics Kazimierz Wielki University in Bydgoszcz Powstańców Wielkopolskich Stress 2 85 090 Bydgoszcz Poland

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Three-Layered Composite Scintillator Based on the Epitaxial Structures of YAG and LuAG Garnets Doped with Ce3+ and Sc3+ Impurities

Scintillation Characteristics of the Single-Crystalline Film and Composite Film-Crystal Scintillators Based on the Ce3+-Doped (Lu,Gd)3(Ga,Al)5O12 Mixed Garnets under Alpha and Beta Particles, and Gamma Ray Excitations