The peculiarities of anion vacancy distribution and the relationship between their concentration and the Tld-500 detector Tl output

A procedure has been developed for estimating the uniformity of anion vacancy distribution in TLD-500 detectors on the basis of anion-deficient corundum single crystals. Vacancy distribution topograms were constructed for TLD-500 detectors with different sensitivities to irradiation. Analysis of the topograms provided correlations between average anion vacancy concentrations and thermoluminescent (TL) yields in the main peak with a maximum at 450 K. To confirm the pattern of regularities, the effects of high-temperature annealing of TLD-500 samples in air at T = 1700 K were studied depending on its duration. Increasing the annealing time from 40 to 105 minutes was found to correlatedly reduce the anion vacancy concentrations and TL-yields in the basic and high-temperature peaks at 450 and 830 K, respectively. © Published under licence by IOP Publishing Ltd.The work was partly supported by the Russian Foundation for Basic Research (Grant No. 18-08-00093-a) and UB RAS (pr. 18-11-2-2)

Optically stimulated luminescence in strongly irradiated anion-deficient corundum and associated phototransfer effects

Optically stimulated luminescence (OSL), its mechanisms and the role of phototransfer effects in it have been comprehensively studied for strongly irradiated anion-deficient corundum with a high-temperature thermoluminescence (TL) peak at 830 K and without it. The fast component of the OSL kinetics in the samples was found to be due to the emptying of the main trap. The slow component was observed only in samples with the 830 K TL peak and was caused by the depletion of deep traps responsible for TL peaks in the range of 500 K<T<740 K. © Published under licence by IOP Publishing Ltd

HIGH-TEMPERATURE THERMOLUMINESCENCE OF ANIONDEFECTIVE CORUNDUM AND ITS APPLICATION FOR HIGH-DOSE DOSIMETRY

Results of the investigation of the thermoluminescence features of the anion-defective single crystals of a-Al20 3 (TLD-500) irradiated by pulsed X-ray and electron beams with nanosecond pulse duration in the 1 — 104 kGy dose range are presented

KINETIC ANALYSIS OF THERMOLUMINESCENT GLOW CURVES IN ANION-DEFECTIVE CRYSTALS α-Al2O3 FROM -40 TO 300 °C

The kinetic parameters of shallow traps were investigated. The influence of the irradiation temperature on the intensity of the main dosimetric peak was investigated. The studies were carried out in the temperature range from -40 to 300 ° С.Авторы выражают благодарность профессору И.И. Мильману за предоставленную помощь. Работа выполнена в рамках государственного задания МИНОБРНАУКИ России (тема «Экспертиза», № АААА-А19-119062590007-2) при частичной поддержке РФФИ (проект № 20-48-660045)

Luminescent Properties of Thin Sensitive Layers Created in Corundum by IR Laser Treatment

The spectra of X-ray luminescence, photoluminescence, optically and thermally stimulated luminescence in thin active layers created by laser treatment on the surface of corundum crystals have been investigated. The association between luminescence activity and anion deficiency has been established.Работа выполнена в рамках государственного задания МИНОБРНАУКИ России (тема «Диагностика», № 122021000030-1) при частичной поддержке РФФИ (проект № 20-48-660045)

LUMINESCENT PROPERTIES OF POWDERS OF ANION-DEFECTIVE CORUNDUM

The dependences of the response of thermo- and optically stimulated luminescence (TL and OSL) on the particle size of the anion-defective corundum powder were studied. The dependences of the OSL and TL responses on the ratio of the particle size and the thickness of the sensitive layer were obtained.Работа выполнена в рамках государственного задания МИНОБРНАУКИ России (тема «Диагностика», № 122021000030-1)

CREATION OF THIN SENSITIVE LAYERS IN CORUNDUM-BASED LUMINESCENT DETECTORS USING LASER IR-HEATINGTECTORS USING LASER IR-HEATING

The modes of surface laser IR-heating of specially treated detectors based on α-Al2O3-δ were investigated. It makes possible to create thin sensitive layers in them in the detectors. The optimal modes for creating thin layers with a thickness of 5 mg/cm2 were found.Работа выполнена в рамках государственного задания МИНОБРНАУКИ России (тема «Экспертиза», № АААА-А19-119062590007-2) при частичной поддержке РФФИ (проект № 20-48-660045)

Towards effective indirect radioisotope energy converters with bright and radiation hard scintillators of (Gd,Y)3Al2Ga3O12 family

Ceramics of quaternary garnets (Gd,Y)3Al2Ga3O12 doped with Ce, Tb have been fabricated and evaluated as prospective materials for indirect energy converters of α-and β-voltaic. Samples were characterized at excitation with an X-ray source and an intense 150 keV electron beam and showed good temperature stability of their emission and tolerance to irradiation. The role of X-rays accompanied the α-particle emitting in the increase of the conversion efficiency is clarified. The garnet-type structure of the matrix in the developed materials allows the production of quality crystalline mass with a light yield exceeding that of the commonly used YAG: Ce scintillator by a factor of two times. © 2022 Korean Nuclear SocietyMinistry of Education and Science of the Russian Federation, Minobrnauka: 075-15-2021-1353, FEUZ-2020-0060; Ministerstwo Edukacji i Nauki, MNiSW: 075-11-2021-070; Ministry of Science and Higher Education of the Russian FederationAuthors with affiliations b, d, e and f acknowledge support from Russian Ministry of Science and Education grant No. 075-15-2021-1353 . The scientific equipment provided by shared research facilities “Scientific Research Analytical Center of National Research Center “Kurchatov Institute” – IREA” was used, with financial support of Russian Federation, represented by the Ministry of Science and Higher Education, agreement No. 075-11-2021-070 dated August 19, 2021. The work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (through the basic part of the government mandate, project No. FEUZ-2020-0060 ) (authors with affiliation “c”).Authors with affiliations b, d, e and f acknowledge support from Russian Ministry of Science and Education grant No. 075-15-2021-1353. The scientific equipment provided by shared research facilities “Scientific Research Analytical Center of National Research Center “Kurchatov Institute” – IREA” was used, with financial support of Russian Federation, represented by the Ministry of Science and Higher Education, agreement No. 075-11-2021-070 dated August 19, 2021. The work was partially supported by the Ministry of Science and Higher Education of the Russian Federation (through the basic part of the government mandate, project No. FEUZ-2020-0060) (authors with affiliation “c”)

Research Facility for Measuring Spectra of Photo-, Radio-, Thermo- and Optically Stimulated Luminescence in Luminescent Active Materials

The installation was created for the study of luminescent-active dosimetric materials. The installation can measure the spectra of photo-, radio-, thermo- and optically stimulated luminescence. The optical stimulation control unit was developed.Работа выполнена в рамках государственного задания МИНОБРНАУКИ России (тема «Диагностика», № 122021000030-1) при частичной поддержке РФФИ (проект № 20-48-660045)