scholarly journals ADVANCED TECHNOLOGY OF LUMINOPHOR SCREENS FOR SOLID RADIOLUMINESCENT LIGHT SOURCES

Doklady BGUIR ◽  
2019 ◽  
pp. 59-66
Author(s):  
E. V. Zelenina ◽  
E. A. Pechertseva ◽  
V. V. Bakhmetyev ◽  
M. M. Sychov
Keyword(s):  
Solid State ◽  
Sol Gel ◽  
Main Idea ◽  
Advanced Technology ◽  
Solid Matrix ◽  
Light Sources ◽  
Phosphor Screen ◽  
Gel Technique ◽  
Radioluminescent Light Sources ◽  
Phosphor Screens

The article observes different methods of coating the phosphor screens on the tritiated titanium matrices for creating the solid-state radioluminescent light sources (SRLS). Technology of SRLS is alternative to the existing technology of the gas-filled radioluminescent light sources. The main idea of SRLS is in bonding the working isotope (tritium) in the solid matrix and combining it with the phosphor. The key problem of SRLS is to provide the closest contact between the tritiated carrier matrix and phosphor screen. The basic requirements for the phosphor screens for SRLS would be the strength of fixation on the plate, uniformity and radiological and thermal stability. There have been made a comparison of various techniques of coating and fixing the phosphor screens by their effect on spectral and brightness characteristics of SRLS. The improved sol-gel technique of suspended sedimentation of phosphor screen from the potassium water glass binder solution was developed. The composition of the solution was established experimentally and we get the strong and uniform experimental prototypes of the glass coated phosphor screens of various thickness. The developed technology allows to deposit the strong and uniform phosphor coatings without using any additional dispersing agents. Screen thickness regulates by the amount of phosphor in the suspension. Also the optimal thickness of the phosphor screen, giving the maximum luminescence intensity was determined. The two laboratory prototypes of solid-state radioluminescent light sources were manufactured by coating the phosphor directly on the tritium β-source.

scholarly journals SYNTHESIS OF ZINC SULFIDE RADIOLUMINESCENT PHOSPHORS WITH USE OF ELECTRONIC BEAM MODIFICATION AND INVESTIGATION OF THEIR PROPERTIES

2021 ◽  
Vol 58 ◽  
pp. 46-50
Author(s):  
Mikhail A. Shvindin ◽  
◽  
Vadim V. Bakhmetyev ◽  
Keyword(s):  
Crystal Structure ◽  
Experimental Data ◽  
Electron Beam ◽  
Solid State ◽  
Zinc Sulfide ◽  
Spectral Characteristics ◽  
Light Sources ◽  
Synthesis Conditions ◽  
Radioluminescent Light Sources ◽  
First Time

Synthesized recombination-type zinc sulfide phosphors used in solid-state radioluminescent light sources (SSRLS) are the object of the research. In the course of the study, experimental data were obtained for the first time on the effect of the amount of the incorporated activator on the brightness-spectral characteristics of radioluminescence upon excitation by β-radiation of tritium. Data were obtained on the changes in the radioluminescence parameters under various synthesis conditions, phase composition and electron-beam modification of the crystal structure of the initial phosphors. The results of the work make it possible to find the best light compositions for the use in solid-state radioluminescent light sources

Immobilization of Eu3+ Ions in Zeolite Matrices in Order to Develop Solid-State Radioluminescent Light Sources

2019 ◽  
Vol 45 (6) ◽  
pp. 537-544
Author(s):  
N. Yu. Ul’yanova ◽  
E. V. Zelenina ◽  
V. L. Ugolkov ◽  
O. Yu. Golubeva
Keyword(s):  
Solid State ◽  
Light Sources ◽  
Radioluminescent Light Sources

Prospects for the Development of Tritium-Based Solid-State Radioluminescent Light Sources

2019 ◽  
Vol 61 (1) ◽  
pp. 55-60 ◽  
Author(s):  
E. V. Zelenina ◽  
M. M. Sychov ◽  
A. I. Kostylev ◽  
K. A. Ogurtsov
Keyword(s):  
Solid State ◽  
Light Sources ◽  
Radioluminescent Light Sources

Ferroelectric and Piezoelectric Properties of (1-x)BaTi0.8Zr0.2O3-xBa0.7Ca0.3TiO3 Ceramics Prepared by Sol-Gel Technique

2010 ◽  
Vol 148-149 ◽  
pp. 1480-1485 ◽  
Author(s):  
Zhong Wen Tan ◽  
Wei Guo Fu ◽  
Xiang Yun Deng ◽  
Ren Bo Yang ◽  
Xiao Fen Guan ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Solid State ◽  
Piezoelectric Coefficient ◽  
Piezoelectric Properties ◽  
Sol Gel ◽  
Piezoelectric Response ◽  
Maximum Dielectric Constant ◽  
Gel Technique ◽  
Sintered Temperature ◽  
Ferroelectric And Piezoelectric Properties

The(1-x)BaTi0.8Zr0.2O3-xBa0.7Ca0.3TiO3 ceramics have been prepared by sol-gel technique, where x is from 0.2 to 0.6. It reveals that the dense ceramics can be obtained when the sintered temperature is above 1250°C. It is lower than that of solid state reaction ceramics. In particular, when x=0.3, at which is near the MPB composition, the ferroelectric and piezoelectric properties are more excellent than the others. The maximum dielectric constant is above 9000, which can be observed in the butterfly shape curves of dielectric constant as a function of electric field. The maximum piezoelectric coefficient d33 can reach 400 pm/V, and it is obtained from the piezoelectric response loops.

scholarly journals Synthesis of ZnS:Cu,Br radioluminescent phosphors using the electron-beam treatment and studying their characteristics

2021 ◽  
Vol 2056 (1) ◽  
pp. 012047
Author(s):  
V V Bakhmetyev ◽  
E V Zelenina ◽  
M A Shvindin
Keyword(s):  
Electron Beam ◽  
Solid State ◽  
Short Range ◽  
Light Sources ◽  
Electron Beam Treatment ◽  
Phase Content ◽  
Acid Base ◽  
Safety Control ◽  
Initial Charge ◽  
Radioluminescent Light Sources

Abstract ZnS:Cu radioluminescent phosphors find their applications in medicine nondestructive testing, safety control and can be used as a part of the solid-state radioluminescent light sources (SRLS). This devices are very promising technology due to their independence longevity and safety compared to the gas-filled RLS. Because of the fact that tritium (the most popular radioisotope for RLS) has a very short range in substances, the improving the operating performances of radiophosphors is a crucial task for SRLS. In our study we used the electron-beam treatment to increase the brightness of radioluminescence of ZnS:Cu phosphors. It was found that bombardment of the phosphors initial charge with electrons of 900 kEv energy improves the brightness of radioluminescence by 15 – 20%. Double modifying of the initial charge and ready phosphor cause the 80% increase of brightness. The effect of electron-beam treatment on the phase content and the surface properties was studied at varying the content of activator (Cu) in the range of 0 – 0.6 % mass. As a result the model describing structure of the acid-base sites on the ZnS:Cu phosphor surface was suggested.

Synthesis and Electron-Beam Modification of Zinc-Sulphide Phosphors for Solid-State Radioluminescent Light Sources (SRLS)

2021 ◽  
Vol 1040 ◽  
pp. 35-40
Author(s):  
Elena V. Zelenina ◽  
Vadim V. Bakhmetyev ◽  
Maxim М. Sychov ◽  
Mikhail A. Shvindin
Keyword(s):  
Electron Beam ◽  
Solid State ◽  
High Energy ◽  
Zinc Sulphide ◽  
Structural Defects ◽  
Light Sources ◽  
Electron Beam Treatment ◽  
Phase Content ◽  
Initial Batch ◽  
Radioluminescent Light Sources

Radioluminescence technologies are at the front line of the optic and electronic studies. Effective, self-contained and safe radioluminescent light sources can find their application in space industry, in medicine and in military technologies. The question of the performance improvement of the solid-state radioluminescent light sources (SRLS) without raising the included activity of working radionuclide can be solved by upgrading the phosphor crystalline structure. The electron-beam treatment for zinc-sulphide phosphors initial batch has been studied in a wide range of concentrations of the activating agent (Cu) for improving the radioluminescent performances of the phosphors, for creating the structural defects that form centers of luminescence. The changes of the phase composition were investigated under different synthesis conditions. It is revealed that electron-beam treatment of the initial batch leads to the growth of the wurtzite phase content in zinc-sulphide phosphors synthesized below the phase transition temperature. The changes of the phase content promote the spectral redistribution under the tritium beta-excitation. It is obviously the reflection of the fact of «green» luminescence centers rearrangement between the volume of the crystal and its surface. The correlations between structural configuration and performances of ionizing luminescence were found. Electron beam treatment gave the 20% increase of brightness of the radioluminescence. The achieved enhancement of luminescence performances allows the development of advanced tight-packed SRLS with minimal radioactivity and high energy-light conversion.

Photocatalytic Degradation of Dibutyl Phthalate: Effect of Catalyst Immobilization

2008 ◽  
Vol 130 (4) ◽  
Author(s):  
O. Bajt ◽  
J. Zita ◽  
P. Novotná ◽  
J. Krýsa ◽  
J. Jirkovský
Keyword(s):  
Light Intensity ◽  
Photocatalytic Degradation ◽  
Dibutyl Phthalate ◽  
Sol Gel ◽  
Degradation Process ◽  
Reaction Rates ◽  
Light Sources ◽  
Catalyst Immobilization ◽  
Polychromatic Light ◽  
Gel Technique

The degradation processes of dibutyl phthalate (DBP), an important pollutant, are rather slow and do not lead to the complete decomposition. In the present work the photocatalytic degradation of dibutyl phthalate in the presence of TiO2 was studied. Experiments were carried out in suspensions and with immobilized layers, prepared from powder suspensions and by sol-gel technique. Two different polychromatic light sources (band maxima at 350nm and 365nm) were used for irradiation. The results confirmed that the photocatalytic degradation of DBP using TiO2 is an efficient degradation process and proceeds even at very low concentration of photocatalyst (0.001gdm−3). Reaction rates were significantly higher in the case of the lamp with the maximum at 365nm, which is due to the higher light intensity of this lamp. At comparable TiO2 amount P25 layers exhibit about 50% of photoactivity using TiO2 suspension.

Sol-gel synthesis of phosphate ceramic composites II

1998 ◽  
Vol 13 (6) ◽  
pp. 1553-1559 ◽  
Author(s):  
Zhicheng Cao ◽  
Burtrand I. Lee ◽  
William D. Samuels ◽  
Li-Qiong Wang ◽  
Gregory J. Exarhos
Keyword(s):  
Reaction Mechanism ◽  
Solid State ◽  
Solid State Nmr ◽  
Sol Gel ◽  
Ceramic Composites ◽  
Direct Reaction ◽  
Tetraethoxy Silane ◽  
Gel Technique ◽  
Sol Gel Synthesis ◽  
First Time

Phosphate ceramics were synthesized using sol-gel technique of direct reaction of P2O5 with tetraethoxy silane (TEOS) or titanium tetraethoxide (Ti(OEt)4). The reaction mechanism of P2O5 and TEOS was deduced using liquid and solid-state NMR. Hexacoordinated silicon in phosphosilicate gels was observed. A specially structured titanium phosphate-layered Ti(HPO4)2 · 2H2O was synthesized for the first time through the sol-gel method. The gelation process and phase transformations were investigated.

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