Abstract
This work is dedicated to the development of new types of composite thermoluminescent (TL) detectors for simultaneous registration of the different components of ionization radiation based on the single crystalline films (SCFs) of Ce3+-doped Lu3−xGdxAl5O12:Ce (x = 0–1.5) garnet and Y3Al5O12:Ce (YAG:Ce) substrates using the liquid phase epitaxy (LPE) growth method. For this purpose, the TL properties of the mentioned epitaxial structures were examined in Risø TL/OSL-DA-20 reader under excitation by α- and β-particles from 242Am and 90Sr-90Y sources. We have shown that the cation engineering of SCF content can result in more significant separation of the TL glow curves of SCFs and substrates under α- and β-particle excitations in comparison with the prototype of such composite detectors based on the Lu3Al5O12:Ce (LuAG:Ce)/YAG:Ce epitaxial structure. Specifically, the difference between the TL glow curves of Lu1.5Gd1.5Al5O12:Ce SCFs and YAG:Ce substrates increases up to 120 K in comparison with a respective value of 80 degrees in the prototype based on the LuAG:Ce/YAG:Ce epitaxial structure. Therefore, the LPE-grown epitaxial structures containing Lu1.5Gd1.5Al5O12:Ce SCFs and Ce3+-doped YAG:Ce substrate can be successfully applied for simultaneous registration of α- and β-particles in mixed fluxes of ionization radiation.
Highlights
The advancement of composite scintillators (CSs) and thermoluminescent (TL) detectors for the registration of the components of mixed ionization fluxes is an actual subject of luminescent materials engineering
We found that the lattice constant of Lu3−xGdxAl5O12:Ce single crystalline films (SCFs) and the misfit value m steeply depends on the Gd content in accordance with Vegard’s law
The first attempt to create a composite TL detector based on the LuAG:Ce SCF/YAG:Ce epitaxial structures was described in our previous work [17]
Summary
The advancement of composite scintillators (CSs) and thermoluminescent (TL) detectors for the registration of the components of mixed ionization fluxes is an actual subject of luminescent materials engineering. In our previous work, we have shown the possibility of simultaneous registration of α-particles and γ-quanta using the separation of the scintillation decay kinetics of the film (SCF) and crystal (SC) parts of composite scintillators, based on the epitaxial structures of different garnet compounds [12,13,14,15,16]. This work is a continuation of the research in this direction and dedicated to the development of new types of composite TL detectors for the simultaneous registration of the different components of mixed ionization fluxes based on the SCFs of Ce3+ -doped Lu3−x Gdx Al5 O12 :Ce (x = 0–1.5) garnet and Y3 Al5 O12 :Ce (YAG:Ce). We expected that the cation engineering of SCF content would result in more significant separation of the TL glow curves of SCFs and substrates in comparison with the prototype of such composite detectors based on the LuAG:Ce SCF/YAG:Ce SC epitaxial structure [17]
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