In this study, we propose novel three-layer composite scintillators designed for the simultaneous detection of different ionizing radiation components. These scintillators are based on epitaxial structures of LuAG and YAG garnets, doped with Ce3+ and Sc3+ ions. Samples of these composite scintillators, containing YAG:Ce and LuAG:Ce single crystalline films with different thicknesses and LuAG:Sc single crystal substrates, were grown using the liquid phase epitaxy method from melt solutions based on PbO-B2O3 fluxes. The scintillation properties of the proposed composites, YAG:Ce film/LuAG:Sc film/LuAG:Ce crystal and YAG:Ce film/LuAG:Ce film/LuAG:Sc crystal, were investigated under excitation by radiation with α-particles from a 239Pu source, β-particles from 90Sr sources and γ-rays from a 137Cs source. Considering the properties of the mentioned composite scintillators, special attention was paid to the ability of simultaneous separation of the different components of mixed ionizing radiation containing the mentioned particles and quanta using scintillation decay kinetics. The differences in scintillation decay curves under α- and β-particle and γ-ray excitations were characterized using figure of merit (FOM) values at various scintillation decay intensity levels (1/e, 0.1, 0.05, 0.01).

Department of Oncology and Brachytherapy Collegium Medicum in Bydgoszcz Nicholas Copernicus University in Toruń Jagiellońska Street 13 15 85 067 Bydgoszcz Poland

European Organization for Nuclear Research Avenue des Particullers EP LHB Group 1211 Geneva Switzerland

Faculty of Physics Kazimierz Wielki University in Bydgoszcz Powstańców Wielkopolskich Street 2 85 090 Bydgoszcz Poland

Institute of Physics Academy of Sciences of the Czech Republic 6253 Prague Czech Republic

Institute of Scintillation Materials National Academy of Sciences of Ukraine Av Nauki 60 61178 Kharkiv Ukraine

Prof Franciszek Łukaszyk Oncology Center Medical Physics Department Dr Izabeli Romanowskiej Street 2 85 796 Bydgoszcz Poland

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