scholarly journals Thermoluminescence Properties of Novel Self-Agglomerating CaSO4:Eu Phosphors Obtained by an Environmentally Friendly Method

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
A. R. García-Haro ◽  
R. Bernal ◽  
C. Cruz-Vázquez ◽  
G. Kitis ◽  
V. M. Castaño
Keyword(s):  
Glow Curve ◽  
Environmentally Friendly ◽  
Beta Particle ◽  
Main Peak ◽  
Binding Material ◽  
Particle Irradiation ◽  
Lower Detection ◽  
Intermediate Order ◽  
Coprecipitation Technique ◽  
Environmentally Friendly Method

In this work, we report the thermoluminescence (TL) properties of self-agglomerating CaSO4:Eu samples obtained by an environmentally friendly coprecipitation technique. No binding material is needed to form solid CaSO4:Eu samples. Samples exposed to beta particle irradiation exhibit a TL maximum at 473.15 K when a 5 K/s heating rate is used, they are two times more sensitive than the TLD-100 commercial dosimeter, and their lower detection limit was determined to be less than 0.69 mGy. The computerized glow curve deconvolution carried out fitting the residual glow curves from McKeever method revealed that the whole glow curve is composed of four individual TL peaks with intermediate-order kinetics. The main peak order kinetics is b = 1.48. This result agrees with that computed using Chen’s formula.

Synthesis and Thermoluminescence of New ZnO Phosphors

2010 ◽  
Vol 1278 ◽  
Author(s):  
C. Cruz-Vázquez ◽  
H. A. Borbón-Nuñez ◽  
V. R. Orante-Barrón ◽  
S. E. Burruel-Ibarra ◽  
V. M. Castaño ◽  
...  
Keyword(s):  
Detection Limit ◽  
Glow Curve ◽  
Radiation Dosimetry ◽  
Chemical Method ◽  
Beta Particle ◽  
High Dose ◽  
Lower Detection Limit ◽  
Particle Irradiation ◽  
Lower Detection ◽  
Dose Radiation

AbstractIn this work, the synthesis and thermoluminescence properties of new ZnO phosphors obtained by a chemical method are reported. Some samples were exposed to beta particle irradiation for doses ranging from 10.0 up to 6,400 Gy, and it was found that the thermoluminescence response as a function of dose is linear for doses below 200 Gy, and sublinear with no saturation clouds for greater doses. A broad shape glow curve with maximum located above 230 °C, that shifts to lower temperatures as dose increases, indicating that second order kinetics thermoluminescence processes are involved. The lower detection limit was estimated to be 13 Gy. We conclude that the phosphors under study are promising to develop dosimeters for high dose radiation dosimetry.

Synthesis and Thermoluminescence of a Spinel-Type Oxide Exposed to Beta-Particle Irradiation

2015 ◽  
Vol 1769 ◽  
Author(s):  
Francisco Brown ◽  
Tomasa C. Hernandez-Perez ◽  
Iliana C. Muñoz ◽  
Victor E. Alvarez-Montaño ◽  
Catalina Cruz-Vazquez ◽  
...  
Keyword(s):  
Glow Curve ◽  
Irradiation Dose ◽  
Relative Sensitivity ◽  
Beta Particle ◽  
Spinel Type ◽  
X Ray ◽  
Beta Particles ◽  
Particle Irradiation ◽  
Minimum Detectable Dose ◽  
First Time

ABSTRACTCurrently, the research team is systematically studying the oxide compounds present in the ternary system In2O3-TiO2-MgO in order to analyze its thermoluminescent (TL) response. The oxide Mg1.5InTi0.5O4 present in this system was synthesized by a solid state reaction at 1350 °C in air. The X-ray powder diffraction pattern showed a spinel-type structure for this compound. In this work, this spinel, as well as its TL properties when exposed to beta particles, are being reported for the first time. The glow curve is simple and wide with a TL maximum located at 203 °C at 21.33 Gy. The peak shows a shift to lower temperatures and it increases its intensity, as the irradiation dose increases. The lineal behavior was observed between 10.66 to 341 Gy, and no saturation signs were observed. The relative sensitivity variation was 2.7% and standard deviation after ten consecutive irradiation - TL readout cycles was 1 %. The minimum detectable dose was 5.65 Gy for this spinel-type oxide [3]. These results suggest the possible application of Mg1.5InTi0.5O4 in dosimetry.

A simple and environmentally friendly method for the synthesis of N-phenylanthranilic acid derivatives

2006 ◽  
Vol 2006 (5) ◽  
pp. 342-344 ◽  
Author(s):  
Hanakere R. Girisha ◽  
Gejjalagere R. Srinivasa ◽  
D. Channe Gowda
Keyword(s):  
Environmentally Friendly ◽  
Environmentally Friendly Method

Study of Afterglow and Thermoluminescence Properties of Synthetic Opal-C Nanoparticles for In Vivo Dosimetry Applications

2013 ◽  
Vol 1530 ◽  
Author(s):  
Marlen Hernández-Ortiz ◽  
Laura S. Acosta-Torres ◽  
Rodolfo Bernal ◽  
Catalina Cruz-Vázquez ◽  
Víctor M. Castaño
Keyword(s):  
Radiation Dosimetry ◽  
Dose Range ◽  
Beta Particle ◽  
In Vivo Dosimetry ◽  
Synthetic Opal ◽  
Genotoxic Effects ◽  
Stöber Method ◽  
Particle Irradiation ◽  
The Stöber Method

ABSTRACTOpal particles, with diameter ca. 80 nm, were synthesized by the Stöber method. Samples were exposed to 100 Gy of beta particle irradiation and its thermoluminescence (TL) emission was recorded. TL response presents good reproducibility, standard deviation 1 %. The glow curve displays two TL peaks 86 and 400 °C and the afterglow (AG) phenomenon is observed immediately after irradiation (< 150°C). The synthetic opal-C exhibits a linear dependence of AG response as function of dose from 0.25 to 8 Gy. This dose range is of interest for personal and clinical dosimetry. Moreover, a previous study indicates that cytotoxic and genotoxic effects caused by opal nanoparticles, did not induce unrepairable DNA damage neither a cellular harm. Therefore, our results show synthetic opal-C is a material useful for in vivo radiation dosimetry.

A multifunctional and environmentally-friendly method to fabricate superhydrophilic and self-healing coatings for sustainable antifogging

2021 ◽  
Vol 409 ◽  
pp. 128228
Author(s):  
Xiaoqin Wang ◽  
Shuhui Li ◽  
Jianying Huang ◽  
Jiajun Mao ◽  
Yan Cheng ◽  
...  
Keyword(s):  
Environmentally Friendly ◽  
Self Healing ◽  
Environmentally Friendly Method

Direct Access to S-Heterocycles by Scandium(III) Triflate Catalyzed Cyclization of Aromatic Thiols and Diols

Synlett ◽  
2021 ◽  
Author(s):  
Maki Minakawa ◽  
Keisuke Minami ◽  
Yuya Sato
Keyword(s):  
Reaction Pathway ◽  
Environmentally Friendly ◽  
Direct Access ◽  
Aromatic Thiols ◽  
Thiophene Derivatives ◽  
Environmentally Friendly Method

AbstractA simple and environmentally friendly method to prepare S-heterocycles by cyclization of aromatic thiols and diols with H2O as a byproduct is described. The Sc(OTf)3-catalyzed dehydrative cyclizations of aromatic thiols and diols provided the corresponding thiopyran and thiophene derivatives. Control experiments were also performed to obtain insights into the reaction pathway

scholarly journals FTIR Spectrophotometry as a Green Tool for Quantitative Analysis of Drugs: Practical Application to Amoxicillin

2018 ◽  
Vol 2018 ◽  
pp. 1-8 ◽  
Author(s):  
Stefany Fanelli ◽  
Alexander Zimmermann ◽  
Eliane Gandolpho Totóli ◽  
Hérida Regina Nunes Salgado
Keyword(s):  
Environmentally Friendly ◽  
Infrared Region ◽  
Potassium Bromide ◽  
Bactericidal Action ◽  
Practical Application ◽  
Mid Infrared ◽  
Brazilian Legislation ◽  
Ich Guidelines ◽  
Ftir Spectrophotometry ◽  
Environmentally Friendly Method

Amoxicillin is an antimicrobial agent that belongs to the penicillin compounds. Its bactericidal action causes a destruction of the cell wall of bacteria. It is widely used in clinical practice, and it belongs to the Brazilian National List of Essential Drugs (RENAME). In literature, there are some green analytical methods for the amoxicillin analysis; however, none of them is focused on its quantification in capsules. Therefore, the aim of this study was to validate an environmentally friendly analytical method for the analysis of this antimicrobial action in capsules, using spectrophotometry in the mid-infrared region. The analyses were performed in the spectral range of 1815–1736 cm−1, and the samples were analyzed as potassium bromide pellets. The method was validated according to the ICH guidelines and Brazilian legislation. Linearity, selectivity, precision, accuracy, and robustness were evaluated and showed adequate results for method validation, in a concentration range of 0.5–1.5 mg/pellet. Thus, it is concluded that the validated spectrophotometric method is able to quantify amoxicillin in capsules. In addition, it is a fast, economical, and environmentally friendly method, since it does not use organic solvents, and it can be used for quality control of routine analysis of this drug.

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