http://dspace.nbuv.gov.ua:80/handle/123456789/114623 Sun, 12 Apr 2026 16:57:01 GMT 2026-04-12T16:57:01Z http://dspace.nbuv.gov.ua:80/bitstream/id/341314/ http://dspace.nbuv.gov.ua:80/handle/123456789/114623 http://dspace.nbuv.gov.ua:80/handle/123456789/121118 Advanced scintillation single crystals based on complex oxides with large atomic number Burachas, S.F.; Nagornaya, L.L.; Onishchenko, G.M.; Piven, L.A.; Pirogov, E.N.; Ryzhikov, V.D. An improved production technology has been developed for scintillation single crystals based on complex oxides with large atomic number – bismuth germanate (BGO), gadolinium silicate (GSO), cadmium tungstate (CWO) and lead tungstate (PWO). Scintillators based on these crystals have good energy resolution and light output, high detection efficiency, they are not hygroscopic, have high radiation stability and mechanical strength. This makes it possible to use them as radiation detectors for high energy physics (PWO), in instruments for radiation and radioecological monitoring (BGO,CWO,GSO). Sat, 01 Jan 2000 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121118 2000-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/121116 Thermostimulated luminescence and the temperature dependence of X-ray luminescence of the Li₂B₄O₇ single crystals Hunda, B.M.; Puga, P.P.; Solomon, A.M.; Holovey, V.M. The copper-doped lithium tetraborate (Li₂B₄O₇:Cu) is one of the famous tissue-equivalent materials for the thermoluminescent dosimetry, being characterized by a high radiation resistivity, a linear dose dependence, a wide operation dose range and a weak dependence of the dose on the ionizing radiation energy. We have performed the thermo-stimulated luminescence (TSL) studies of the lithium tetraborate single crystals doped with different copper concentrations. The optimal dopant concentration (1.91⋅10⁻³ weight % Cu) at which the maximum TSL intensity of the high-temperature maximum is revealed has been found. It has been elucidated that the further copper concentration increase results in the TSL intensity decrease due to the concentrational damping luminescence. It has been found that for the Li₂B₄O₇ single crystals with the optimal Cu dopant concentration within the temperature range under study TSL is primarily due to the carriers deliverance from two local trapping levels with the Et₁= 0.90 ± 0.03 eV, Et₂ = 1.72 ± 0.07 eV energies and the frequency factors of 4⋅10¹⁰ s⁻¹ and 5⋅10¹⁶ s⁻¹, respectively. The occurrence of these local levels affects considerably the temperature dependence of X-ray luminescence. Above 215⁰C the temperature damping of luminescence is observed being well described by the Mott formula with the EA = 0.65 ± 0.05 eV activation energy. Sat, 01 Jan 2000 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121116 2000-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/121114 New possibility of retrospective EPR dosimetry Vorona, I.; Ishchenko, S.; Okulov, S.; Petrenko, T.T. Tooth enamel plates irradiated by different types of radiation were studied by electron paramagnetic resonance imaging with local gradient of magnetic field. The dependence of radiation defect distributions on an irradiation type was found. A new procedure of retrospective electron paramagnetic resonancedosimetry determining the irradiation type was proposed. Sat, 01 Jan 2000 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121114 2000-01-01T00:00:00Z http://dspace.nbuv.gov.ua:80/handle/123456789/121113 Application of scintillators based on single-crystalline Lu₃Al₅O₁₂:Ce³⁺ films for radiation monitoring in biology and medicine Zorenko, Yu.; Gorbenko, V.; Konstankevych, I.; Grinev, B.; Globus, M.; Batentschuk, M. Possibility of producing screens of X-ray detectors using liquid phase epitaxy on Y₃Al₅O₁₂ substrates covered by Lu₃Al₅O₁₂:Ce single crystalline films (SCF) is studied. Optical, luminescent and luminous characteristics of these SCF doped with isoelectronic La, Y, Sc impurities are analyzed. The possibility of crystallization of Lu₃Al₅O₁₂: Ce SCF on Y₃Al₅O₁₂ substrates by means of matching the lattice parameters of these garnets, when Lu³⁺ ions in Al³⁺ octa-sites, is proved. With the aim of matching the emission spectra of SCF based on Lu₃Al₅O₁₂: Ce, with the spectral sensitivity range of radiation detectors – CCD cameras – we investigated SCF containing Gd³⁺, Tb³⁺, and Eu³⁺ impurities. The maximum light yield, exceeding that of analogs based on Y₃Al₅O₁₂:Ce SCF by the factor of 1.1-1.5, is shown to be intrinsic for Lu₃Al₅O₁₂:Ce³⁺, Lu₃Al₅O₁₂:Ce, Y, La and Lu₃Al₅O₁₂:Ce, Tb SCF. An increase of the effective atomic number Zeff and density r up to the values of 60.6 and 7.35 g/cm³ respectively, enables the efficiency of X-ray absorption in comparison with Y₃Al₅O₁₂:Ce³⁺ SCF by the factor of 2.5–8 higher and to reach spatial resolution not less than 0.75–1.0 µm at the SCF thickness of 1.0–2.0 mm. Sat, 01 Jan 2000 00:00:00 GMT http://dspace.nbuv.gov.ua:80/handle/123456789/121113 2000-01-01T00:00:00Z