Zobrazeno 1 - 10
of 42
pro vyhledávání: '"G.O. Shirinyan"'
Autor:
C. Pedrini, Ashot Petrosyan, G.O. Shirinyan, K. L. Ovanesyan, R. V. Sargsyan, Christophe Dujardin
Publikováno v:
Journal of Crystal Growth. 338:143-146
Crystallographic study of the Lu 3 Al 5 O 12 :Sc system shows existence of a wide range of compositions involving substitutions by Sc for both six-fold octahedral and eight-fold dodecahedral sites of the lattice. In comparison to other rare-earth gar
Autor:
C. Pedrini, Christophe Dujardin, E. Auffray, P. Lecoq, Daniel Abler, K. L. Ovanesyan, G.O. Shirinyan, Ashot Petrosyan, R. V. Sargsyan
Publikováno v:
Journal of Crystal Growth. 312:3136-3142
LuAG:Ce single crystals with various activator concentrations were grown by the vertical Bridgman technique. Characterization of crystals was done in terms of actual doping level, macroscopic defects and degree of non-equivalent substitutions by Lu f
Publikováno v:
Journal of Crystal Growth. 293:74-77
The phase diagram of the Lu 2 O 3 –Al 2 O 3 system has been defined showing all three compounds existing in the system, i.e. with molar ratios 2:1, 1:1 and 3:5, which exhibit strongly differing stabilities. The range of stability of the perovskite
Autor:
K. L. Ovanesyan, Christian Pedrini, Christophe Dujardin, Irina Kamenskikh, G.O. Shirinyan, Atom Eganyan, Natalia Guerassimova, Ashot Petrosyan
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 537:134-138
Single crystals of yttrium gallium and lutetium gallium garnets doped with ytterbium were grown from the melt by Czochralski technique. Comparison is made between the lattice spacing of ceramic and single crystals to estimate the degree of octahedral
Autor:
Christophe Dujardin, Nicolas Garnier, G.O. Shirinyan, Ashot Petrosyan, T. I. Butaeva, K. L. Ovanesyan, Christian Pedrini, Irina Kamenskikh, M.V. Derdzyan
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 537:168-172
Performance properties of LuAP, a material of highly promising potential for future PET scanners, are presented, as they relate to crystal growth and composition. The light yield measured in 2×2×10 mm3 elements with 0.4–0.5% Ce and cut from large
Autor:
Christophe Dujardin, K. L. Ovanesyan, Nicolas Garnier, M. V. Derzyan, T. I. Butaeva, Ashot Petrosyan, G.O. Shirinyan, Irina Kamenskikh, C. Pedrini
Publikováno v:
Optical Materials. 24:259-265
In this paper we present results of optical and scintillation studies of three series of LuAP and LuYAP crystals differing in yttrium and cerium concentrations. Comparison of as-grown and UV-irradiated crystals has revealed two types of color centers
Autor:
N. Guerassimova, J. Mallet, M Cribier, C. Pedrini, G.O. Shirinyan, V. V. Mikhailin, K. L. Ovanesyan, I.N. Shpinkov, Ashot Petrosyan, Dmitry A. Spassky, Christophe Dujardin, Nicolas Garnier, Remi Chipaux, J-P. Meyer, Irina Kamenskikh
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 486:278-282
Luminescence of Yb3+ from the charge-transfer state with broad emission bands and short radiative lifetimes (few to tens of nanoseconds depending on the host lattice and the temperature) is attractive for the development of fast scintillators capable
Autor:
Nicolas Garnier, C. Pedrini, S Sowinski, K. L. Ovanesyan, Christophe Dujardin, Ashot Petrosyan, G.O. Shirinyan, Paul Lecoq, A. Belsky
Publikováno v:
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 486:74-78
LuAP and LuYAP are promising single-crystal scintillators for use in the next generation of positron emission tomographs. The practical crystal composition in terms of major components and Ce-doping level is however under discussion yet. Bridgman and
Autor:
K. L. Ovanesyan, Christophe Dujardin, C. Pedrini, Nicolas Garnier, T. I. Butaeva, G.O. Shirinyan, Ashot Petrosyan, M. V. Derzyan
Publikováno v:
Radiation Effects and Defects in Solids. 157:943-949
The light yield and decay properties are the most crucial parameters of cerium-doped lutetium orthoaluminate (LuAlO 3 -Ce, LuAP) and yttrium containing solid solution (Lu 1 m x Y x AlO 3 -Ce, LuYAP), which will be used in Positron Emission Tomographs
Autor:
Christophe Dujardin, K. L. Ovanesyan, Ashot Petrosyan, T. I. Butaeva, G.O. Shirinyan, Andrei Belsky, C. Pedrini
Publikováno v:
Journal of Crystal Growth. 211:252-256
Many Ce-doped (Lu,Y)AlO 3 solid solution single crystals of various Lu/Y ratio and dopant concentration have been grown using the vertical Bridgman and Czochralski processes. Light yields of around 200% of BGO have been measured under gamma-ray excit