17 International Conference on Radiation Physics and Chemistry Of

National Research Tomsk Polytechnic University Institute of High Current Electronics SB RAS Tomsk Scientific Center SB RAS th 17 International Conference on Radiation Physics and Chemistry of Condensed Matter Abstracts October 2–7, 2016 Tomsk, Russia Tomsk Tomsk Polytechnic University Publishing House 2016 Co-Chairmen: Alexey Yakovlev Institute of High-Technology Physics, TPU, Tomsk, Russia Viktor Lisitsyn Institute of High-Technology Physics, TPU, Tomsk, Russia International Advisory Committee: Abdirash Akilbekov L.N. Gumilyov Eurasian National University, Kazakhstan Aleksandr Lushchik Tartu University, Estonia Aleksandr Nepomnyashchikh Institute of Geochemistry, Russia Anatoly Kupchishin Al-Farabi Kazakh National University, Kazakhstan Boris Grinev Institute for Scintilliation Material of NAS, Ukraine Boris Kalin Moscow Institute of Physical Engineering, Russia Boris Shulgin Ekaterinburg State Technical University, Russia Daniel Maliys CEA DAM, France Evgenij Kotomin Institute of Solid State Physics, Latvia Evgenij Martynovitch Irkutsk State University, Russia Gilles Damamme CEA – Centre du Ripault, France Kurt Schwarz CSI Accelerator Center, Darmschtadt, Germany Mustafa Kidibaev Bishkek, Institute of Physics, Kyrgyzstan Tengsei Ma Dalian National Laboratory of Materials Modification, Dalian University of Technology, China Vsevolod Kortov Ekaterinburg State Technical University, Russia Yurij Zakharov Kemerovo State University, Russia Conference manager Olga Lobankova RPC manager Conference is sponsored by Conference was supported by RFBR (project #16-02-20464). Abstracts are presented as received from authors. 17th International Conference on Radiation Physics and Chemistry of Condensed Matter: Abstracts. – Tomsk: TPU Publishing House, 2016. – 112 pp. Sessions Luminescence: processes, luminescence centers, scintillators and luminophores, application Methods, instruments and equipment for radiation studies Non-linear physicochemical processes under severe energetic impact: breakdown, facture, explosion, etc. Physical principles of radiation technologies Radiation defects: structure, formation, properties Submission 9 Luminescence: processes, luminescence centers, scintillators and luminophores, application PHOTO- AND THERMOLUMINESCENCE OF HIGHLY IRRADIATED ANION-DEFECTIVE ALUMINA CRYSTALS VSEVOLOD KORTOV, VLADIMIR PUSTOVAROV AND SERGEY ZVONAREV Ural Federal University, Russia [email protected] Anion-defective alumina (ADA) crystals are widely used in TL and OSL personal dosimetry and in environmental radiation monitoring. However, recent researches show that ADA crystals are also promising for measuring high and ultrahigh doses up to 1,000 kGy. This work is devoted to investigations of a changing of TL and PL properties of ADA crystals under high-dose irradiation. The methods of UV and VUV spectroscopy were used to measure PL and PLE spectra in samples exposed to high-dose of gamma-rays and nanosecond electrons beam. Significant changes in luminescent and dosimetric properties of ADA crystals are observed after exposure to high doses. In the PL and PLE spectra, alongside with emission bands of F and F+-centers, which are created by oxygen vacancies, additional bands emerge. They are caused by aggregate F2-type centers in different charge states. At the same time high-temperature TL peaks appear, which are associated with deep traps. The concentration of such deep centers increases as a result of radiation-induced transformations of luminescence centers. Several methods can be used for high-dose dosimetry by means of ADA crystals. TL yield of high-temperature peaks can be registered in the 550–850 K range. High doses were successfully measured by using PTTL and TA-OSL methods. It was also shown that ultrahigh doses can be registered due to the effect of high dose sensitization of ADA crystals. Our studies show that ADA crystals can be used as multipurpose detectors of ionizing radiations with the measurement range of 10 6 106 Gy. Keywords: alumina, photoluminescence, irradiation 4 Luminescence: processes, luminescence centers, scintillators and luminophores, application Submission 163 CRYSTAL GROWTH AND SCINTILLATION PROPERTIES + OF BACLI DOPED WITH Eu2 IONS ARTEM VASILKOVSKIY1, ANTON RUSAKOV1, ALEXEY SHALAEV1, ROMAN SHENDRIK1 AND ALEXEY SUBANAKOV2 1Vinogradov Institute of Geochemistry SB RAS, Russia 2The Baikal Institute for Nature Management SB RAS, Russia [email protected] Inorganic scintillators are used for the detection of ionizing radiation and are widely applied in such areas as physics, medicine, geology and others. Of these, alkaline earth halide scintillators have received great attention during the past few years due to their high light yield close to the theoretical limit. In this work we consider the problem of obtaining single crystals BaClI doped with divalent Eu and study their scintillation and optical properties. In crystal growing special attention was paid to the preparation of raw materials. For removing water and hydroxyl groups the reactants in stoichiometric amounts were placed into the quartz ampoule and then were slowly heated in vacuum. The modes of drying materials were selected according to differential scanning calorimetry spectroscopy. The crystals were grown from the melt by the vertical Bridgman technique in the multizone thermal facility. The growth rate was 1mm/h and the temperature gradient about 15 C/cm. Excitation, emission and absorption spectra were measured for the obtained crystals. The photoluminescence spectra of crystals showed broad emission bands centered around 408 nm. Their excitation spectra showed two peaks at 280 and 350 nm, respectively. According to the spectra obtained Eu is included in the lattice in the divalent state. The light yield of our sample obtained from the X-ray luminescence spectrum is around of 50,000 photons / MeV. Further research will be + aimed at improving the optical characteristics of crystals BaClI: Eu2 . This work was supported by RFBR (project # 15-02-06514 and project # 16-32-00198). Keywords: Inorganic scintillators, Сrystal growing, Luminescence. 5 Submission 208 Luminescence: processes, luminescence centers, scintillators and luminophores, application + SPECTROSCOPY OF BABRI CRYSTALS DOPED WITH Eu2 ANTON RUSAKOV1, ARTEM VASILKOVSKIY1, ALEKSEI SHALAEV2 AND ROMAN SHENDRIK2 1Federal state budgetary institution of science A.P. Vinogradov Institute of Geochemistry SB RAS, Russia 2Vinogradov Institute of Geochemistry SB RAS, Russia [email protected] Spectra of photo- and X-ray luminescence crystal BaBrI activated by different concentrations + of Eu2 ions were measured. Luminescence spectra confirm that europium is part of BaBrI lattice in the divalent state with its characteristic transitions 5d–4f. The excitation and emission spectra, show that with increasing concentration of europium, emission intensity increases, and as a result, increased light output. We calculated relative light output BaBrI crystals with different concentrations of europium. The calculation was made based on the ratio of the area of the spectrum of X-ray luminescent crystal BaBrI:Eu to the area of the spectrum of the crystal CaF2:Eu. It is known that the light output of the crystal CaF2:Eu 0,3 % of 19000 ± 1000 photons/MeV. The greatest light yield of about 81,000 photons/MeV have crystals with a high content of europium 7–8 mol.%. The absorption spectrum of the crystals BaBrI:Eu was first obtained in this work for low concentrations of europium. The spectrum shows a double peak associated with the fd-absorption in + Eu2 . On the absorption spectrum of the band gap Eg was evaluated. For crystals BaBrI:Eu Eg is 5.1 eV. The decay curves of the time show that the crystals BaBrI activated by different concentrations + of Eu2 the largest contribution comes from the fast component, about 60–70 %, the slow component contributes 30–40 %. At low concentrations of europium slow component makes a significant contribution. The decay time in BaBrI crystals depends on the concentration of the activator. This work was supported by RFBR (project # 15-02-06514). Keywords: absorption spectra, decay time. X-ray luminescence. photoluminescence. 6 Luminescence: processes, luminescence centers, scintillators and luminophores, application Submission 210 LUMINESCENCE OF ULTRAFINE MAGNESIUM OXIDE CERAMICS WITH DEEP TRAPS SERGEY NIKIFOROV, VSEVOLOD KORTOV AND ARSENIY KIRYAKOV Ural Federal University, Russia [email protected] The luminescence properties of wide-gap insulators are largely determined by charge transfer processes between different types of localized defect states, in particular, associated with deep traps. The deep traps occur in many wide-gap oxides. In particular, they are present in magnesium oxide. Many aspects of their influence on the luminescent properties of this material are studied insufficiently and require further investigations. This paper deals with the study of luminescent properties, related to the presence in material the deep trapping centers, in ultrafine magnesium oxide. Ultrafine anion-defective magnesium oxide ceramics were synthesized from pressed nanopowder at high temperature (1100–1400 °С) in vacuum in the presence of carbon for increase the luminescence output due to thermochemical coloration. The decisive influence of F-type centers associated with oxygen vacancies in different charge states on spectral-luminescent properties of the samples under study was confirmed by luminescent spectroscopy techniques. During the investigation of deep trap

Load more