M. V. Zavertyaev
Russian Academy of Sciences
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Featured researches published by M. V. Zavertyaev.
Bulletin of the Lebedev Physics Institute | 2013
Yu. D. Zavartsev; M. V. Zavertyaev; A. I. Zagumennyi; A. F. Zerrouk; V. A. Kozlov; S. A. Kutovoi
The results of the study of optical and luminescence characteristics of new LFS-3 heavy scintillation crystals are presented. Advantages of these crystals in comparison with conventional scintillators are discussed. The radiation resistance of LFS-3 scintillation crystals is studied using an intense 60Co radioactive source and a proton beam with an energy of 155 MeV. No changes in the optical transmission of LFS-3 crystals after their irradiation with a dose of 23 Mrad are detected.
Bulletin of the Lebedev Physics Institute | 2018
S. N. Andreev; M. V. Belov; Yu. D. Zavartsev; M. V. Zavertyaev; A. I. Zagumennyi; V. A. Kozlov; S. A. Kutovoi; N. V. Pestovskii; S. Yu. Savinov
New scintillation orthovanadate crystals Ca:GdVO4 and Ca:YVO4 featuring intrinsic luminescence are grown. The spectra of pulsed cathodoluminescence of new scintillators and their luminescence decay time are studied. Using γ-rays with an energy of 662 keV from the 137Cs source, total absorption spectra (so-called photopeaks) for new orthovanadate crystals are measured. It is shown that the light yield of Ca:YVO4 and Ca:GdVO4 crystals is 28100 photon/MeV and 14000 photon/MeV, respectively.
Bulletin of the Lebedev Physics Institute | 2017
M. V. Belov; M. V. Zavertyaev; A. I. Zagumenniy; V. A. Kozlov; V. A. Kondratyuk; S. A. Kutovoi; N. V. Pestovskii; S. Yu. Savinov
New scintillation crystals Ce:Sc:Li:LFS and Ce:Sc:Ca:LFS based on lutetium oxyorthosilicate are grown. Optical characteristics and the decay time of new scintillators are studied. For Ce:Sc:Ca:LFS crystals, it is shown that oxygen vacancies dominate in the energy transfer in the matrix transmission range of 3.46–6.26 eV. It is found that the high density of oxygen vacancies at the lower part of the Ce:Sc:Ca:LFS crystal leads to a decrease in the scintillation time to 22–26 ns.
Bulletin of the Lebedev Physics Institute | 2016
S. N. Andreev; M. V. Zavertyaev; Yu. D. Zavartsev; A. I. Zagumenniy; V. A. Kozlov; N. V. Pestovskii; S. A. Kutovoi; A. A. Petrov; S. Yu. Savinov
The spectra of pulsed cathodoluminescence (PCL) and optical transmission (OT) of crystals grown from Lu3.01−xYxAl4.99O12 melts doped with Cr3+, Ce3+, and Sc3+ ions before and after irradiation with gamma radiation of a 60Co radioactive source are studied. The gamma radiation dose absorbed by samples was 45 Mrad. The maximum gamma-radiation-induced absorbance in the range of 525–700 nm was 0.48 cm−1. Changes in the PCL and OT spectra of all samples after irradiation were detected. It was found that the relative intensity of Cr3+ bands increased after irradiation in relation to the Ce3+ band intensity by a factor of 1.6–8; the OT spectra of all samples after irradiation lost specific features and became identical. The results obtained are qualitatively explained. According to the explanation, the induced absorption is controlled first of all by optically active Frenkel defects formed after irradiation, which include an oxygen vacancy and an interstitial oxygen ion.
Bulletin of the Lebedev Physics Institute | 2016
Yu. D. Zavartsev; M. V. Zavertyaev; A. I. Zagumenniy; A. F. Zerrouk; V. A. Kozlov; S. A. Kutovoi; N. V. Pestovskii; A. A. Petrov; S. Yu. Savinov
Optical and luminescence characteristics of Lu2+2ySi1-yO5+y (LFS) scintillation crystals are studied before and after irradiation with doses to 45 Mrad from a 60Co source. LFS crystals were doped with Ce3+, Sc3+, Ca2+, and Y3+ ions with various concentrations. The dependence of the radiation resistance of LFS crystals on Ce ion concentration is detected. For the crystal of composition Ce:Sc:Ca:Y:LFS, it was found that its optical transmission (OT) and pulsed cathodoluminescence (PCL) spectra before irradiation do not differ from the spectra measured after irradiation with a dose of 45 Mrad within experimental error. The nature of the radiation resistance of rare-earth lutetium oxyorthosilicates (LFS) is discussed.
Journal of Physics: Conference Series | 2015
V. A. Kozlov; V. N. Ochkin; N. V. Pestovskii; A. A. Petrov; S. Yu. Savinov; A. I. Zagumennyi; M. V. Zavertyaev
The spectra and decay time of pulsed cathodoluminescence (PCL) of a scintillating crystals excited by the electron beam is compared to the spectra and decay time of the luminescence of the same crystals initiated by γ-rays (GL). It is shown that spectra and decay time of PCL and GL are identical within the experimental errors. The explanation of these results is based on taking into account the physical processes within the crystal media under the irradiation by high-energy particles. The results of this study confirm that the PCL method may be used for the rapid analysis of the luminescent properties of scintillators.
arXiv: Instrumentation and Detectors | 2011
Valery A. Kozlov; S. A. Kutovoi; A. I. Zagumennyi; Yu. D. Zavartsev; M. V. Zavertyaev; A. F. Zerrouk
Journal of Russian Laser Research | 2018
V. A. Kozlov; S. A. Kutovoi; N. V. Pestovskii; A. A. Petrov; A. A. Rodionov; S. Yu. Savinov; Yu. D. Zavartsev; M. V. Zavertyaev; A. I. Zagumennyi
Journal of Russian Laser Research | 2018
S. N. Andreev; V. A. Kozlov; S. A. Kutovoi; N. V. Pestovskii; A. A. Petrov; S. Yu. Savinov; Yu. D. Zavartsev; M. V. Zavertyaev; A. I. Zagumennyi
Archive | 2017
Valery A. Kozlov; S. A. Kutovoi; N. V. Pestovskii; A. A. Petrov; A. A. Rodionov; S. Yu. Savinov; Yu. D. Zavartsev; M. V. Zavertyaev; A. I. Zagumennyi