LiMgBO :Dy , a low Z material was prepared using the solution combustion method and its luminescence properties were studied using X-ray diffraction (XRD), scanning electron microscopy (SEM), thermoluminescence (TL), photoluminescence (PL), Fourier transform infrared spectroscopy, and electron paramagnetic resonance (EPR) techniques. Reitvield refinement was also performed for the structural studies. The PL emission spectra for LiMgBO :Dy consisted of two peaks at 478 due to the F → H magnetic dipole transition and at 572 nm due to the hypersensitive F → H electric dipole transition of Dy , respectively. A TL study was carried out for both the γ-ray-irradiated sample and the C irradiated samples and was found to show high sensitivity for both. Moreover the γ-ray-irradiated LiMgBO :Dy sample showed linearity in the dose range 10 Gy to 1 kGy and C -irradiated samples show linearity in the fluence range 2 × 10 to 1 × 10 ions/cm . In the present study, the initial rise method, various heating rate method, the whole glow curve method, glow curve convolution deconvolution function, and Chen's peak shape method were used to calculate kinetic parameters to understand the TL glow curve mechanism in detail. Finally, an EPR study was performed to examine the radicals responsible for the TL process.
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http://dx.doi.org/10.1002/bio.3694 | DOI Listing |
Molecules
December 2024
Department of Science and Humanities, School of Engineering and Technology, CHRIST University, Bangalore 560029, Karnataka, India.
Using the solid-state reaction technique, varied YSiO phosphors activated by europium (Eu) ions at varied concentrations were made at calcination temperatures of 1000 °C and 1250 °C during sintering in an air environment. The XRD technique identified the monoclinic structure, and the FTIR technique was used to analyze the generated phosphors. Photoluminescence emission and excitation patterns were measured using varying concentrations of Eu ions.
View Article and Find Full Text PDFHealth Phys
January 2025
Department of Nuclear Engineering and Radiological Sciences, University of Michigan, 2355 Bonisteel Boulevard, Ann Arbor, MI 48109-2104.
A glow-curve analysis code was previously developed in C++ to analyze thermoluminescent dosimeter glow curves using automated peak detection while a first-order kinetics model. A newer version of this code was implemented to improve the automated peak detection and curve fitting models. The Stochastic Gradient Descent Algorithm was introduced to replace the prior approach of taking first and second-order derivatives for peak detection.
View Article and Find Full Text PDFAppl Radiat Isot
March 2025
Departamento de Investigación en Polímeros y Materiales, Universidad de Sonora, Apartado Postal 130, Hermosillo, Sonora, 83000, Mexico.
This work reports the synthesis and beta particle excited thermoluminescence (TL) characteristics of NaF and NaF:Tm phosphors synthesized via wet precipitation. The samples were subjected to thermal annealing at 750 °C for 5, 10, and 24 h in an air atmosphere. A sensitization effect is observed in repeated irradiation-TL readout cycles.
View Article and Find Full Text PDFAppl Radiat Isot
March 2025
Department of Physics, University of Botswana, Private Bag UB 0022, Gaborone, Botswana.
Soda ash, due to its various use for industrial applications, is a phosphor likely to be found in the vicinities of radiation facilities where retrospective dosimetry may be required in the unlikely events of radiation accidents/incidents. The ash is therefore a potential material for retrospective dosimetry using luminescence techniques. In this report, the thermoluminescence characteristics of soda ash from Suan pan, Botswana are presented.
View Article and Find Full Text PDFJ Fluoresc
December 2024
Physics Department, Faculty of Science, Ain Shams University, Cairo, Egypt.
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