Article
Engineering, Biomedical
Jeppe Brage Christensen, Michele Togno, Konrad Pawel Nesteruk, Serena Psoroulas, David Meer, Damien Charles Weber, Tony Lomax, Eduardo G. Yukihara, Sairos Safai
Summary: The Al2O3:C optically stimulated luminescence detectors were found to be dose rate independent and applicable for radiobiological experiments in proton beams at ultra-high dose rates, with minimal deviation from nominal doses. Two setups for ultra-high dose rate experiments were presented, as well as a new method to extract beam spot size of narrow pencil beams.
PHYSICS IN MEDICINE AND BIOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Camilla L. Nielsen, Rosana M. Turtos, Martin Bondesgaard, Jacob S. Nyemann, Mads L. Jensen, Bo B. Iversen, Ludvig P. Muren, Brian Julsgaard, Peter Balling
Summary: This study demonstrates that Cu-doped LiF nanocubes are excellent candidates for 3D optically stimulated luminescence (OSL) dosimetry due to their high sensitivity, dose linearity, and stability under ambient conditions. The embedded nanocubes in silicone sheets show promising transparency and light yield, offering potential for future 3D OSL-based dosimetry.
Article
Chemistry, Physical
Caline O. Santos, Bianca F. S. Santos, Yara R. R. S. Rezende, Anderson M. B. Silva, Linda V. E. Caldas, Divanizia N. Souza, Ronaldo S. Silva, Marcos V. S. Rezende
Summary: This work focuses on the synthesis and characterization of Al2O3 phosphors doped with different concentrations of barium. By evaluating their luminescent response through TL and OSL, it is found that the samples exhibit different glow peak shapes and curves with varying dopant concentrations. The activation energies associated with material transfer processes are determined through TL emission curves, indicating a high photoionization cross section for blue light-emitting diodes.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Chemistry, Analytical
Katarzyna M. Szufa, Renata Majgier
Summary: This article presents the use of dietary supplements as emergency detectors in dose recovery process. The experimental results show that dietary supplements with potassium chloride exhibit good performance and can correctly differentiate different dose levels.
Article
Engineering, Biomedical
Benjamin Broadhead, Christopher Noble, Prabhakar Ramachandran
Summary: This paper compares the sensitivity variance, stability of measurement, and linearity between Al2O3:C and BeO as potential alternatives for optically stimulated luminescence dosimetry. Although BeO shows a higher response to the same dose, it exhibits a strong exponential decline in initial signal response. With pre-conditioning and individual normalization, BeO proves to be a viable alternative, potentially offering higher accuracy, precision, and reproducibility for in-vivo dosimetry.
PHYSICAL AND ENGINEERING SCIENCES IN MEDICINE
(2022)
Article
Chemistry, Physical
Bryant Kanies, Robert Hayes, Ge Yang
Summary: Aluminum oxide (Al2O3) is a versatile ceramic material with potential applications in optoelectronics and radiation dosimetry when doped with carbon. This study demonstrates that nanometer-thick Al2O3 coatings have promising potential as novel nano-dosimeters for various applications such as nonproliferation and safeguards, retrospective dosimetry, and nondestructive inspection.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Chemistry, Inorganic & Nuclear
F. O. Ogundare, M. L. Chithambo, B. O. Akintunde
Summary: Continuous wave optically stimulated luminescence (CW-OSL) and linear modulation OSL (LM-OSL) characteristics were investigated in three different types of cowrie shells. Results showed that both CW-OSL and LM-OSL curves of the shells consist of fast, medium, and slow components, with independent peak values for all samples and linear increase with dose. The shells exhibit low coefficient of variation, making them potential materials for retrospective dosimetry.
APPLIED RADIATION AND ISOTOPES
(2021)
Article
Optics
Mads L. Jensen, Rosana M. Turtos, Brian Julsgaard, Volkmar Schulz, Peter Balling, Stefan Gundacker
Summary: This study presents a novel method for determining the branching ratio of thermalized carriers to optically stimulated luminescence (OSL) in scintillators. The method was demonstrated using a cerium-doped lutetium oxyorthosilicate (LYSO:Ce) crystal, and the observed signal was confirmed to originate from OSL photons. The branching ratio of thermalized carriers to OSL traps in LYSO:Ce was found to be (1.0 +/- 0.2)% upon excitation with 511 keV gamma photons.
JOURNAL OF LUMINESCENCE
(2022)
Article
Engineering, Biomedical
Jeppe Brage Christensen, Ivan Domingo Munoz, Niels Bassler, Christina Stengl, Lily Bossin, Michele Togno, Sairos Safai, Oliver Jaekel, Eduardo Gardenali Yukihara
Summary: Objective. This study investigates the use of Al2O3:C and Al2O3:C,Mg OSL detectors for dose and radiation quality determination in light ion beams. The determined radiation quality is applied to improve dosimetry by correcting for ionization quenching. Main results. The determined Q (eff) values in H-1 and He-4 ion beams are within 5% of the simulated values. Correcting the detector response for ionization quenching leads to doses within 2% of the reference doses. Significance. Al2O3:C and Al2O3:C,Mg OSL detectors are applicable for dosimetry and radiation quality estimation in H-1 and He-4 ions, with promising results for C-12 ions.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
Article
Materials Science, Ceramics
Wanli Li, Yifan Sun, Zhaoyang Chen, Pengjun Zhao, Junhua Wang, Yan Zhao, Yanwei Fan, Chengfa He
Summary: In this study, Sm3+ doped glass-ceramic with crystallized BaZn2(PO4)(2) was prepared and its structural, optical, and stimulated luminescence dosimetry properties were investigated. The results showed that the OSL intensity reached a maximum at a Sm3+ concentration of 0.25 mol%, after which a concentration quenching effect was observed. The material also exhibited thermoluminescence and had a linear radiation dose response range of 0.2-500 Gy.
JOURNAL OF NON-CRYSTALLINE SOLIDS
(2022)
Article
Optics
V Guckan, V Altunal, A. Ozdemir, K. Kurt, Z. Yegingil
Summary: The temperature dependence of Infrared Stimulated Luminescence (IRSL) in MgO:Tb,Gd, Li samples was investigated and characterized using XRD and SEM. The study identified TL peak traps and the source of the IRSL signals, determining the optimized readout temperature.
JOURNAL OF LUMINESCENCE
(2021)
Article
Optics
Pooja Seth, Shruti Aggarwal, Shaila Bahl, Pratik Kumar
Summary: This study investigates the OSL properties of MCNS material and finds that it exhibits good OSL performance under blue light excitation, with higher intensity and linear dose response compared to commercial phosphor. Structural and morphological characterization is done using XRD, SEM, EDS, and TEM. ESR study reveals the existence of copper and the role of defect centers. MCNS phosphor shows potential as an OSL dosimeter and provides new knowledge to improve the OSL sensitivity of LiF material.
Article
Chemistry, Physical
L. F. Souza, C. R. E. Silva, D. N. Souza, M. S. Nogueira
Summary: This study investigates the potential use of luminescent materials in diagnostic radiology tandem systems. Results show that both detector pairs can be effectively used for energies below 50 keV, with MBO/Al2O3:C demonstrating higher efficacy compared to 80-20MBO/Al2O3:C. The highest uncertainty is observed for MBO/Al2O3:C.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Optics
Oskari Ville Pakari, Jeppe Brage Christensen, Eduardo Gardenali Yukihara, Lily Bossin
Summary: The objective of this work is to apply a model that accounts for the presence of shallow traps to the analysis of pulsed optically stimulated luminescence (POSL) data. We present the detailed analysis of a PATD experiment of Al2O3:C and propose a model that considers the influence of shallow traps. The results are important for interpreting thermal quenching models and lifetime measurements in luminescent materials.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Camilla Lonborg Nielsen, Rosana Martinez Turtos, Mads Lykke Jensen, Brian Julsgaard, Peter Balling
Summary: In this study, phase-pure LiBaF3 nanoparticles were successfully synthesized, exhibiting radioluminescence with three peaks corresponding to different luminescent processes. Optically- and thermally stimulated luminescence showed a common luminescent pathway. The OSL signal was linearly related to dose up to-1 kGy. The TL glow peak at around 120 degrees C was depleted by optical stimulation, and the OSL signal disappeared following a TL readout. The thermal trap depth was found to be-1 eV. The high OSL light yield and reasonable fading make the nanoparticles an excellent candidate for OSL dosimetry.
JOURNAL OF LUMINESCENCE
(2023)