Cerium-doped oxide single-crystal films for biological and radiation monitoring

Development of Composite Scintillators Based on Single Crystalline Films and Crystals of Ce3+-Doped (Lu,Gd)3(Al,Ga)5O12 Mixed Garnet Compounds

“…The LPE method also opens the possibility of creating advanced types of composite scintillators (CSs) of “phoswich-type” (phosphor sandwich) for registration of the different components of ionizing radiation, for instance, for analysis of the content of mixed fluxes of particles and quanta with various penetrating depths. ,− Such CSs present the all-solid-state crystalline systems, including one or two SCFs intended for registration of low penetrating α- and β-particles, and a bulk single crystal (SC) substrate, serving to register high penetrating radiation (X- or γ-rays).…”

“…The possible types of CSs have been recently considered by some of us in refs , − . The first type of CSs was created on the basis on the LPE grown epitaxial structures of Y 3 Al 5 O 12 garnet (YAG) .…”

“…The second type of CS based on the YAG:Ce SCF and YAG:Sc SC substrates was also proposed in refs and and tested for selective registration of mixed radiation of particles and quanta. Apart from the difference in the scintillation decay kinetics, the separation of the partial components of the mixed fluxes in this type of CS may also be performed by registration of the differences in the emission spectra of the SCF and SC parts of the CS scintillator, peaked correspondingly at 530 and 280 nm. ,, The advantage of this composition in comparison with the above examined type of CS is considerably higher LY of the YAG:Sc SC (about of 25% in comparison with LY of NaI:Tl SC under γ-ray 241 Am excitation). , Meanwhile, the disadvantage of such type of CSs is the noticeable temperature quenching of the YAG:Sc luminescence in the room temperature (RT) range…”

“…The advanced triply layered CSs based on the combination of YAG:Ce and YAG:Nd SCFs, sequentially growing by the LPE method onto YAG:Sc SC substrates, were proposed also in refs and for the registration of the α- and β-particles on the background of X-ray or soft γ-quanta. The registration of the signals from the different parts of CS is performed by determination of the differences in the decay kinetics of the scintillations with typical lifetimes t 1/e of 70 ns for YAG:Ce SCF, 3.0 μs for YAG:Nd SCF and 0.9 μs for YAG:Sc SC .…”

“…The registration of the signals from the different parts of CS is performed by determination of the differences in the decay kinetics of the scintillations with typical lifetimes t 1/e of 70 ns for YAG:Ce SCF, 3.0 μs for YAG:Nd SCF and 0.9 μs for YAG:Sc SC . It should be noted that due to the low density ρ = 4.5 g/cm 3 and effective atomic number Z eff = 29, the YAG:Nd and YAG:Sc SCs may be used only for registration of low-energy ionizing radiation. , Therefore, it is promising to fabricate CSs for registration of the mixed fluxes of particles and high-energy quanta with using single crystalline oxide compounds, which are characterized by high values of ρ and Z eff. , …”