Influence of Modifier Oxide on the rmoluminescence and Dosimetric Characteristics of Lithium Borate Glasses Doped with Pr 3+ ions (original) (raw)
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Thermoluminescence (TL) characteristics of X-ray irradiated pure and doped with four different rare earth ions (viz., Pr3+, Nd3+, Sm3+ and Eu3+) Li2O-Cao-B2O3 glasses have been studied in the temperature range 303-573K; the pure glass has exhibited single TL peak at 424K. When this glass is doped with different rare earth ions no additional peaks are observed but the glow peak temperature of the existing glow peak shifted gradually towards higher temperatures with gain in intensity of TL light output. The area under the glow curve is found to be maximum for Eu3+ doped glasses. The trap depth parameters associated with the observed TL peaks have been evaluated using Chen's formulae. The possible use of these glasses in radiation dosimetry has been described. The result clearly showed that europium doped calcium borate glass has a potential to be considered as the thermoluminescence dosimeter.
Infrared luminescence and thermoluminescence of lithium borate glasses doped with Sm 3+ ions
Thermoluminescence (TL) characteristics of X-ray irradiated pure and doped with Sm 3+ ions Li 2 O-MOB 2 O 3 (where MO=ZnO, CaO, CdO) glasses have been studied in the temperature range of 303 to 573 K. All the pure glasses exhibited single TL peaks at 382 K, 424 K and 466 K. When these glasses were doped with Sm 3+ ions no additional peaks have been observed but the glow peak temperature of the existing glow peak shifted gradually towards higher temperatures with gain in intensity of TL light output. The area under the glow curve was found to be maximum for Sm 3+ doped glasses mixed with cadmium oxide as a modifier. The trap depth parameters associated with the observed TL peaks have been evaluated using Chen's formulae. The possible use of these glasses in radiation dosimetry has been described. The results clearly showed that samarium doped cadmium borate glass has a potential to be considered as a thermoluminescence dosimeter.
Thermoluminescence Studies on Li 2 O-MO-B 2 O 3 Glasses Doped with Rare Earth Ions
Thermoluminescence (TL) characteristics of X-ray irradiated pure and doped with four different rare earth ions (viz., Pr 3+ , Nd 3+ , Sm 3+ and Eu 3+) lithium borate glasses mixed with the three different modifiers ZnO, CaO and CdO have been studied in 303-573 K. All the pure glasses have exhibited single thermoluminescence peak at 382, 424 and 466 K, respectively. When these glasses are doped with different rare earth ions no additional peaks are observed but the glow peak temperature of the existing glow peak shifted gradually towards higher temperatures with gain in intensity of thermoluminescence light output. The area under the glow curve is also found to be maximum for Eu 3+ doped glasses. The glasses containing CdO as modifier have exhibited the maximum thermoluminescence light output. The trap depth parameters associated with the observed thermoluminescence peaks have been evaluated using Chen's formulae. The possible use of these glasses in radiation dosimetry has been described.
Journal of Radioanalytical and Nuclear Chemistry, 2014
Copper doped zinc lithium borate glass was prepared by solid state melt quenching method and characterized using X-ray diffractometry. The effect of varying concentration of dopant CuO on thermoluminescence (TL) properties of zinc lithium borate is reported in this paper. The best annealing temperature and time were found to be 300°C and 30 min respectively. While the optimal heating rate was 3°C. Glow curves with single peaks for all concentrations were obtained. The TL intensity increases with the increase of dopant concentration and radiation dose from 0.5 to 4 Gy. Time-base thermal fading was stable. Attractive reusability and kinetic parameters of the phosphor were also achieved. These outstanding features show that our dosimeter has the potential ability to use for radiation processing dosimetry.
Luminescence properties of Pr 3 þ doped Li 2 O-MO-B 2 O 3 glasses
Lithium borate glasses of composition 30Li 2 O-10MO-59B 2 O 3 :1Pr 2 O 3 (MO ¼ZnO, CaO and CdO) were prepared by a conventional melt quenching method. The amorphous nature of these glasses was confirmed by X-ray diffraction. Characterization of these glasses was carried out by differential scanning calorimetry and infrared spectra. Optical absorption and photoluminescence spectra of these glasses were investigated. Judd-Ofelt intensity parameters Ω λ (λ ¼2, 4, and 6) are evaluated from the intensities of various absorption bands of optical absorption spectra. From this theory various radiative properties like transition probability A, branching ratio β r , the radiative lifetime τ R , and the stimulated emission cross-section σ P for various emission levels of these glasses have been determined and reported. The relationship between the structural modifications and luminescence efficiencies of all the three glasses is explained. After X-ray irradiation on these glasses, the thermoluminescence emission properties were also studied. The thermoluminescence studies indicate that CdO modified glass gives out the maximum thermoluminescence light output among the three glasses studied.
Journal of Radioanalytical and Nuclear Chemistry, 2015
This paper presents the main dosimetric characteristics and kinetic parameters of a newly proposed borate glass dosimeter modified with lithium and magnesium oxide (LMB) and co-doped with Dy 2 O 3 and P 2 O 5 . Dosimetric features include thermoluminescence (TL) glow-curve, annealing procedure, TL sensitivity, photon dose response, fading, reproducibility, minimum detectable dose, kinetics order, activation energy (E) and frequency factor (s). The proposed dosimeter exhibits simple glow curves, good linearity from 0.01 up to 4 Gy, easy annealing, excellent reproducibility and minimal fading. These attractive features will pave the way to its use in radiation dosimetry.
2016
The influence of dopants, Ti and V, on the thermoluminescence (TL) properties of lithium borate glass (LB) is investigated in this study. The samples were exposed to different γ-ray doses in the range 1–10 Gy and their thermoluminescence (TL) was recorded in the temperature range 323 673 °K. The optimum concentration for enhancing the (LB) was 0.6mol% and 0.2mol% of TiO2 and V2O5 respectively. The glow curves of the two products have three peaks at 628, 648 and 654oK for LB:Ti and 627, 648 and 660oK for LB:V. The TL response of the principal peak exhibited a linear increase with t he increases of γ-dose. The comparison of TL response of the studied glasses with that of LiF:Mg,Ti (TLD-100) indicated an improvement in the dose response in terms of linearity even though with lower sensitivity for the measurement of γdoses. The kinetic parameters were estimated using the peak fit deconvolution technique. From the experimental data it can be shown that the LB:Ti and LB:V are suitable for...
Influence of Nd 3+ ions on TL characteristics of Li 2 O-MO-B 2 O 3 (MO 5 ZnO, CaO, CdO) glass system
Thermoluminescence (TL) characteristics of X-ray irradiated pure and doped with Nd 3? ions glasses have been studied in the temperature range 303-573 K; all the pure glasses have exhibited single TL peak at 382, 424 and 466 K, respectively. When these glasses are doped with Nd 3? ions no additional peaks are observed but the glow peak temperature of the existing glow peak shifted gradually towards higher temperatures with gain in intensity of TL light output. The area under the glow curve is found to be maximum for Nd 3?-doped glasses mixed with cadmium oxide as modifier. The trap depth parameters associated with the observed TL peaks have been evaluated using Chen's formulae. The possible use of these glasses in radiation dosimetry has been described. The result clearly showed that neodymium (Nd)-doped cadmium borate glass has a potential to be considered as the thermoluminescence dosimeter.
The Thermoluminescence Response of Dy Doped Calcium Borate Glass Subjected to 6MV Photon Irradiation
This paper presents the thermoluminescence (TL) response and sensitivity of various dopant concentration of Dy into borate glass. Borates glass present absorption coefficient that closely to human bone and teeth. This fact makes borate as an ideal material for TL material either for medical or environmental dosimeter. Therefore, a series of glasses based on xCaO-(100-x)B2O3 system (0 x 100) % weight has been prepared by using melt quenching method. In this research, Dy doped (0.01-0.4) mol% to 30CaO-70B2O3 glass sample were studied to investigate the TL properties in terms of dose-response relationship and sensitivity. Samples were irradiated to various doses range 0.5-4.0 Gy subjected to 6 MV photon irradiation by using LINAC Primus MLC 3339. The TL intensity of various dopant concentration were studied and it was founds that the 0.3 mol% Dy has the highest TL response and has linear dose response relationship. The highest sensitivity was calculated as 58 nC.mg-1.Gy-1 for 0.3 mol% Dy concentration.
Thermoluminescence response of rare earth activated zinc lithium borate glass
A B S T R A C T New glasses of zinc lithium borate doped with terbium oxide were synthesized by high temperature solid-state reaction. The amorphous nature of the glasses was confirmed using x-ray diffraction analysis (XRD). Thermoluminescence (TL) response of pure zinc lithium borate (ZLB) and zinc lithium borate doped with ter-bium (ZLB: Tb) exposed to gamma radiation was measured and compared. There is significant enhancement in the TL yields of ZLB: Tb compared to that of pure ZLB. Effect of varying concentration of dopant (Tb 4 O 7) on the TL response of zinc lithium borate was investigated. 0.3 mol% concentration of Tb exhibited strongest TL intensity. Thermoluminescence curve of the phosphor consist of single isolated peak. The TL response of the new materials to the exposed radiation is linear within 0.5–100 Gy range of dose with sublinearity at the lower region of the curve. High sensitivity was exhibited by the new amorphous materials. Reproducibility, thermal fading and energy response of the proposed TLD were investigated and shows remarkable result that made the phos-phor suitable for radiation dosimetry.