scholarly journals Preparation of Tb³⁺-doped K₂GdF₅ Used to Neutron Dosimetry

2014 ◽  
Vol 4 (4) ◽  
pp. 30-37
Author(s):  
Xuan Vinh Ha ◽  
Phan Thao Tien Doan ◽  
Chi Thang Nguyen
Keyword(s):  
Glow Curve ◽  
Solid State Reaction Method ◽  
Main Peak ◽  
Neutron Absorption ◽  
Neutron Dosimetry ◽  
Reaction Method ◽  
Study Results ◽  
Absorption Section ◽  
Fading Effect ◽  
Very High

The neutron absorption section of gadolinium atom is very high, so that the K2GdF5 crystals doped with Tb3+ ions have been studied for neutron dosimetry by the thermoluminescence (TL) method. The K2GdF5 crystals doped 2%, 3% and 5% concentrations of Tb3+ ions were synthesized by solid state reaction method. The TL properties were studied after the exposure of the samples to neutron source. The experimental results showed that the TL glow-curves of K2GdF5:Tb3+ has the simple, suitable shape for the dosimetry applications. The TL sensitivity of this material is higher than that of commercial TLD-100 and TLD-900 dosimeters. The thermal fading effect of Tb3+-doped K2GdF5 is very low. The glow curve consists of the main peak at temperature of 202oC. The glow curve deconvolution into individual the peaks showed that the curve had a main peak at 202oC, and kinetic order b = 2. The study results indicated that the K2GdF5 doped with Tb3+ is very remarkable material can be applied in neutron dosimetry field.

scholarly journals Effects of Gamma and Beta Radiations to Dosimeters Fabricated from K₂YF₅ and K₂GdF₅

2014 ◽  
Vol 4 (3) ◽  
pp. 47-54
Author(s):  
Xuan Vinh Ha ◽  
Phan Thao Tien Doan ◽  
Chi Thang Nguyen
Keyword(s):  
Glow Curve ◽  
High Sensitivity ◽  
Solid State Reaction Method ◽  
Nuclear Radiation ◽  
Beta Radiation ◽  
Reaction Method ◽  
Dosimetric Peak ◽  
Study Results ◽  
Fading Effect ◽  
Very High

K2YF5 and K2GdF5 doped with rare earth can be used as thermoluminescent (TL) dosimeters for gamma, beta radiations. In this study, the K2YF5 and K2GdF5 doped with Tb, Pr, Sm, and Dy with different concentrations were synthesized by solid state reaction method. These double fluoride dosimeters were irradiated with different radiations, namely beta and gamma. The study results showed that in general, the TL intensity of K2GdF5 is higher than that of K2YF5. The K2GdF5 crystals doped with Tb3+, Pr3+ have very high TL sensitivities. But the sensitivities of Sm3+, Dy3+ doped- are very low. The TL glow curve of K2YF5:Tb consists of three peaks at temperatures 132oC, 207oC and 240oC, and its intensities are approximately. The TL glow curve of K2GdF5:Tb has dosimetric peak at the temperature 196oC (heating rate 2oC/s), the temperature of this peak suitable for dosimetry application. The TL sensitivity of K2GdF5:Tb is higher than that of TLD-100 and TLD-900 dosimeters for the gamma and beta radiation. The dosimeters K2GdF5:Tb has high sensitivity and linearity for gamma, beta radiations. In addition, the thermal fading effect of TL intensity was very low. The study results showed that these materials can be used in nuclear radiation dosimeters.

scholarly journals STUDY ON THERMOLUMINESCENCE PROPERTIES OF K2GdF5:Tb3+

2018 ◽  
Vol 56 (1A) ◽  
pp. 102
Author(s):  
Ha Xuan Vinh
Keyword(s):  
Solid State ◽  
Luminescence Property ◽  
Solid State Reaction Method ◽  
Nuclear Radiation ◽  
Main Peak ◽  
Radiation Doses ◽  
Orthorhombic Structure ◽  
Sem Images ◽  
Reaction Method ◽  
Wrinkled Surface

In this article, K2GdF5 substance was doped by various Tb3+ ion with concentrations 2, 5, 10, 15, 20 mol%, and the materials were synthesized by the solid state reaction method. The K2GdF5 material had orthorhombic structure of Pnam symmetry with the wrinkled surface structure  shown on SEM images. The fluorescence spectrum indicated that the luminescence property of this material was due to the Tb3+ ions. In the thermoluminescence (TL) investigation, the glow curves of K2GdF5:Tb3+ owned three peaks at 196, 236 and 305 °C when measuring at            2 °C/s heating rate, the main peak (at 196 oC) could be used to determine the dose by the TL method. The sensitivity, linearity and responsivity to different radiation doses of materials were also examined. In addition, some of the thermoluminescence responses of materials with neutron doses were also investigated. The results showed this materials own thermoluminescence properties, which could be applied in measuring nuclear radiation including neutron doses.

Fabrication and Properties of Zinc Silicate Phosphors through Solid State Reaction

2010 ◽  
Vol 160-162 ◽  
pp. 594-598
Author(s):  
Guo Jian Jiang ◽  
Jia Yue Xu ◽  
Hui Shen ◽  
Yan Zhang ◽  
Lin He Xu ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Solid State Reaction Method ◽  
Emission Peak ◽  
Zinc Silicate ◽  
Red Phosphor ◽  
Reaction Method ◽  
Long Afterglow ◽  
Luminescent Mechanism ◽  
Silicate Phosphors

Zinc silicate-based (Zn2SiO4:Eu3+) long afterglow phosphors were produced by solid state reaction method. The effects of borax and Eu2O3 additive on the properties of fabricated products have been studied. The results show that, there is not much difference in phase compositions within the borax additive amount; however, their SEM morphologies are different. Borax additive can increase the grain size of the product. Some sintering phenomena could be observed in the sample with Eu2O3 addition. The fluorescence spectroscopy results indicate that, the emission peak of the sample with Eu3+ additive located at 612nm, which may be a good candidate for red phosphor applications. The luminescent mechanism of Zn2SiO4:Eu3+ is also discussed.

Luminescence properties of dysprosium doped calcium magnesium silicate phosphor by solid state reaction method

2015 ◽  
Vol 649 ◽  
pp. 1329-1338 ◽  
Author(s):  
Ishwar Prasad Sahu ◽  
Priya Chandrakar ◽  
R.N. Baghel ◽  
D.P. Bisen ◽  
Nameeta Brahme ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Reaction ◽  
Magnesium Silicate ◽  
Solid State Reaction Method ◽  
Luminescence Properties ◽  
Reaction Method ◽  
Silicate Phosphor ◽  
Calcium Magnesium
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