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Epitaxial growth of composite scintillator based on the Tb3Al5O12:Ce single crystalline film and Gd3Al2.5Ga2.5O12:Ce crystal substrates

Abstract

The work presents our last achievements in the development of advanced composite scintillator for simultaneous registration of α-particles and γ-quanta in the mixed ionizing fluxes based on the single crystalline films (SCFs) of Tb3Al3O12:Ce (TbAG:Ce) garnet and Gd3Al2.5Ga2.5O12:Ce (GAGG:Ce) single crystal (SC) substrate using the liquid epitaxy (LPE) growth method from the melt-solution based on the PbO-B2O3 flux. The separation of the signals from SCF and SC components of such composite scintillator can be realized by means of registration of the difference in the scintillation decay times of SCFs and substrate scintillators and can be achieved at large K=t(SCF)/t(SC) ratio, which is usually above 2. The TbAG:Ce SCFs possess relatively fast scintillation response under α–particle excitation with the decay times t1/e=344-380 ns and t1/100=3130-3770 ns. Meanwhile, the scintillation response of TbAG:Ce SCFs under α–particle excitation is significantly slower in the 500-4000 ns range than that in the GAGG:Ce crystal with the decay times t1/e=270-280 ns and t1/20=1280-1300 ns. We have found that for TbAG:Ce/GAGG:Ce composite scintillators, the optimal K ratio changes from 2.0 to 3.0 at the registration of scintillations with a shaping time of 700-4000 ns. For this reason, TbAG:Ce/GAGG:Ce composite scintillator possesses the best scintillation properties from all known LPE grown analogues for simultaneous registration of α–particles and γ–quanta in the mixed fluxes.

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Publication details

The article was received on 05 Apr 2018, accepted on 30 May 2018 and first published on 30 May 2018


Article type: Paper
DOI: 10.1039/C8CE00536B
Citation: CrystEngComm, 2018, Accepted Manuscript
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    Epitaxial growth of composite scintillator based on the Tb3Al5O12:Ce single crystalline film and Gd3Al2.5Ga2.5O12:Ce crystal substrates

    S. Witkiewicz-Lukaszyk, V. Gorbenko, T. Zorenko, K. Paprocki, O. Sidletskiy, A. Fedorov, J. Mares, R. Kucerkova, M. Nikl and Y. Zorenko, CrystEngComm, 2018, Accepted Manuscript , DOI: 10.1039/C8CE00536B

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