Article
Optics
J. M. Kalita, S. Kaya-Keles, G. O. Cakal, N. Meric, G. S. Polymeris
Summary: The study found that ulexite is a boron mineral with potential for radiation dosimetry and dating, characterized by four glow peaks and different activation energies. These findings suggest that ulexite could serve as a promising luminescent material.
JOURNAL OF LUMINESCENCE
(2021)
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)
Article
Optics
J. M. Kalita, S. Kaya-Keles, G. O. Cakal, N. Meric, G. S. Polymeris
Summary: The colemanite-rich borate mineral from Turkey exhibits monoclinic crystal structure with high contents of B and CaO. It shows explosive release of water below 200 degrees C and produces thermoluminescence and optically stimulated luminescence following beta irradiation. The sample has multiple glow peaks at specific temperatures and the OSL decay curve indicates three components with different dose responses.
JOURNAL OF LUMINESCENCE
(2022)
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
Nuclear Science & Technology
Eduardo G. Yukihara, Adrie J. J. Bos, Pawel Bilski, Stephen W. S. McKeever
Summary: The search for new materials for thermoluminescence and optically stimulated luminescence dosimetry is an important research area, but it has faced challenges and slow progress, calling for a more guided approach in developing new luminescent materials.
RADIATION MEASUREMENTS
(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, Physical
L. Pan, S. Sholom, S. W. S. McKeever, L. G. Jacobsohn
Summary: This study investigated magnesium aluminum spinels with different Mg:Al ratios for optically stimulated luminescence dosimeters, finding that stoichiometric spinel showed superior OSL dose response, stability, and sensitivity compared to other ratios.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
R. Majgier, G. Okada
Summary: The OSL and TL properties of K2SO4:Ce were investigated, showing strong emission in the range of 300-400 nm due to the doping with Ce3+ ions. The OSL stimulation can be done with visible light and infrared, and there are differences in intensity, decay rate, and total counts when comparing the 550 nm and 900 nm stimulations. The TL curve shows both optically active and non-optically active traps, and the OSL-TL correlation study reveals at least three optically active traps that are emptied to varying degrees by different stimulations.
RADIATION PHYSICS AND CHEMISTRY
(2023)
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
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
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
Materials Science, Multidisciplinary
V. Guckan, S. W. Bokhari, V. Altunal, N. E. Varan, K. Kurt, I. Yildiz, W. Gao, Z. Yegingil
Summary: This study investigates the characteristics of NaMgF3:Dy1%,Eu0.1% fluoroperovskite using Thermoluminescence (TL) and Optically Stimulated Luminescence (OSL) radiation dosimetry methods. Different emission peaks were observed on the spectrum, which could be attributed to different ion emissions. The kinetics parameters of TL and the dependence of bandgap on composition were determined.
MATERIALS RESEARCH BULLETIN
(2023)
Article
Optics
S. Sholom, S. W. S. McKeever
Summary: Analysis of thermoluminescence (TL) glow curves in aluminosilicate glass shows that the glow curve in the -400 K--600 K region can be partly explained by thermally excited tunneling from a defect excited state to the recombination center. Additionally, a TL signal is observed due to thermal excitation directly to the delocalized band from a distribution of trapping states. Optical bleaching removes the TL signal from this region while producing an optically stimulated luminescence (OSL) signal. The OSL decay curve can be described by optically excited tunneling, along with ionization of trapped electrons directly to the delocalized band.
JOURNAL OF LUMINESCENCE
(2022)
Article
Nuclear Science & Technology
Li Fu, Kaiyong Tang, Hui Cui, Zungang Wang, Zhiyuan Li, Haijun Fan, Siyuan Zhang, Mo Zhou
Summary: The effect of boron co-doping on the OSL and TL properties of LiMgPO4:Tb,Sm,B prepared by solid-state reaction was investigated. X-ray diffraction confirmed the structure of the prepared materials. The TL glow curves of samples irradiated with ss rays showed that the peaks at 190 or 280 degrees C were for a first-order kinetic glow curve, which remained unaffected by boron doping concentration. The sensitivity of OSL reached a maximum when the boron doping concentration was 4 mol%, with a factor 2.6 enhancement in the OSL-signal.
RADIATION MEASUREMENTS
(2023)
Article
Engineering, Electrical & Electronic
S. Bhowmick, S. Pal, A. Singh, S. A. Khan, D. R. Mishra, R. J. Choudhary, D. M. Phase, T. K. Chini, A. K. Bakshi, Aloke Kanjilal
Summary: Anodized aluminum oxide (AAO) in amorphous form doped with carbon ions demonstrates significantly enhanced continuous wave OSL (CW-OSL) sensitivity when exposed to beta radiation. Cathodoluminescence (CL) and X-ray photoelectron spectroscopy (XPS) analyses show that implanted carbon atoms can stabilize oxygen vacancies in AAO, affecting the CW-OSL response.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2021)
Article
Engineering, Biomedical
Alessio Parisi, Pawel Olko, Jan Swakon, Tomasz Horwacik, Hubert Jablonski, Leszek Malinowski, Tomasz Nowak, Lara Struelens, Filip Vanhavere
Summary: This study compares the differences between PHITS-simulated lineal energy distributions in water targets and corresponding experimental spectra measured with silicon detectors. The effect of the silicon-to-water conversion on the RBE was explored for the first time and a bin-to-bin conversion method based on PSTAR was proposed, which provides better results.
PHYSICS IN MEDICINE AND BIOLOGY
(2022)
Article
Optics
Leonardo V. S. Franca, Fernanda H. Borges, Rogeria R. Goncalves, Oswaldo Baffa
Summary: The aim of this study was to evaluate the optically stimulated luminescence (OSL) lifetimes of different polycrystalline CaB6O10:Ln, Agx (Ln = Gd, Tb and Ce; x: % molar concentration) compounds. The luminescence lifetimes were determined using time-tagged time-resolved (TTTR) data analysis of the OSL under pulsed stimulation. The results showed that different compounds exhibited different dominant components and lifetimes, and the relative molar concentrations of Gd and Ag had an influence on the lifetimes.
JOURNAL OF LUMINESCENCE
(2022)
Article
Nuclear Science & Technology
Lily Bossin, Jeppe Brage Christensen, Oskari Ville Pakari, Sabine Mayer, Eduardo Gardenali Yukihara
Summary: The aim of this study is to assess the photon energy and angle response of the radiophotoluminescence personal dosimetry system used at the Paul Scherrer Institute (PSI) and compare it with the operational quantities defined in the ICRU Report 95. The results indicate that a new dosimetry algorithm can improve the estimation of personal dose without redesigning the dosimeter badges.
RADIATION MEASUREMENTS
(2022)
Article
Materials Science, Ceramics
Eduardo Gardenali Yukihara
Summary: The paper reviews the use of TL and OSL techniques as research tools in luminescence, focusing on their ability to detect trapping centers that affect scintillator efficiency and influence the properties of persistent phosphors, storage phosphors, and dosimeters. The main analysis techniques are discussed, along with their limitations. Examples of applications where TL or OSL analyses have provided valuable information on the trapping and recombination of charges created by ionizing radiation are presented.
CERAMICS INTERNATIONAL
(2023)
Article
Instruments & Instrumentation
Federico A. Geser, Dominik Werthmueller, Malgorzata M. Kasprzak, Eduardo G. Yukihara, Sabine Mayer
Summary: The goal of this study is to develop and validate a numerical model for calibrating clearance monitors, which is used to determine conversion factors between measured count rates and activity for non-standard radionuclides and geometries. Monte Carlo simulations were conducted using the FLUKA code, and the model parameters were optimized offline to correct the simulation results. Experimental measurements of point sources and measurements of sources in different geometries were used for parameter optimization and model validation, respectively. The maximum relative discrepancy between calculated and measured efficiencies in the validation process was less than 10%. This procedure is crucial for calibrating clearance monitors used in particle accelerator and nuclear facilities.
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
(2022)
Article
Nuclear Science & Technology
Eduardo G. Yukihara, Adrie J. J. Bos, Pawel Bilski, Stephen W. S. McKeever
Summary: The search for new materials for thermoluminescence and optically stimulated luminescence dosimetry is an important research area, but it has faced challenges and slow progress, calling for a more guided approach in developing new luminescent materials.
RADIATION MEASUREMENTS
(2022)
Article
Engineering, Biomedical
S. Motta, J. B. Christensen, M. Togno, R. Schafer, S. Safai, A. J. Lomax, E. G. Yukihara
Summary: This work aims to characterize LiF:Mg,Ti thermoluminescence detectors (TLDs) for dosimetry of a 250 MeV proton beam delivered at ultra-high dose rates (UHDR). The dose rate independence of LiF:Mg,Ti TLDs and their usability for dosimetry of narrow proton beams were investigated. The results show that LiF:Mg,Ti TLDs can be used for dosimetry of UHDR proton beams considering the dose rate independence they exhibit.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
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
Engineering, Biomedical
S. Motta, J. B. Christensen, F. Frei, P. Peier, E. G. Yukihara
Summary: This study investigates the response of different types of thermally stimulated luminescence detectors (TLDs) and optically stimulated luminescence detectors (OSLDs) for dosimetry of ultra-high dose rate electron beams. The results show that the investigated TLDs are dose rate independent within the experimental uncertainties, with a relative deviation lower than 4% from the reference dose. Al2O3:C OSLDs exhibit a decreasing response with the dose rate, but still remain within 10% of the reference dose. These findings demonstrate the suitability of these detectors for dosimetry of ultra-high dose rate electron beams.
PHYSICS IN MEDICINE AND BIOLOGY
(2023)
Article
Chemistry, Physical
Lily Bossin, Igor Plokhikh, Jeppe Brage Christensen, Dariusz Jakub Gawryluk, Yuuki Kitagawa, Paul Leblans, Setsuhisa Tanabe, Dirk Vandenbroucke, Eduardo Gardenali Yukihara
Summary: The objective of this work is to assess the potential of MgB4O7:Ce,Li for optically stimulated luminescence (OSL) dosimetry. The operational properties of MgB4O7:Ce,Li were evaluated, including thermoluminescence spectroscopy, sensitivity, thermal stability, luminescence lifetime, dose response at high doses, fading, and bleachability. Compared with Al2O3:C, MgB4O7:Ce,Li showed comparable OSL signal intensity, higher saturation limit, and shorter luminescence lifetime. However, further optimization is needed due to anomalous fading and shallow traps.
Article
Nuclear Science & Technology
S. Motta, J. B. Christensen, E. G. Yukihara
Summary: This work demonstrates the precision achieved in medical dosimetry using automated TL/OSL readers and correcting for sample-to-sample sensitivity variations using Sr-90/Y-90 beta source.
RADIATION MEASUREMENTS
(2023)
Article
Environmental Sciences
Iva Ambrozova, Martin Kakona, Roman Dvorak, Jakub Kakona, Martina Luzova, Martin Poviser, Marek Sommer, Olena Velychko, Ondrej Ploc
Summary: This paper investigates the latitudinal effect on the position of the Regener-Pfotzer maximum. Balloon flight experiments and radiation detectors were used to measure the altitude profile of ionization in the atmosphere. The results, along with simulations, show that the geomagnetic effective vertical cut-off rigidity, phase of the solar cycle, and type of detected particles all have an impact on the position of the Regener-Pfotzer maximum.
RADIATION PROTECTION DOSIMETRY
(2023)
Article
Environmental Sciences
Veronika Olsovcova, Iva Ambrozova, Anna Cimmino, David Horvath, Benoit Lefebvre, Ondrej Ploc, Vojtech Stransky, Roman Trunecek, Roberto Versaci
Summary: This article describes a commissioning experiment at ELI Beamlines facility and discusses the challenges and solutions encountered in detecting ionizing radiation.
RADIATION PROTECTION DOSIMETRY
(2023)
Article
Environmental Sciences
Sabine Mayer, Lily Bossin, Jeppe B. Christensen, Lisa Pedrazzi, Eduardo G. Yukihara
Summary: The Paul Scherrer Institute (PSI) is the largest research institute for natural and engineering sciences in Switzerland. It provides complex large research facilities for scientists from Switzerland and around the world. PSI has radiation protection areas and requires users to carry personal dosemeters. The individual monitoring service at PSI provides dosimeters for customers and collects dose statistics over 30 years.
RADIATION PROTECTION DOSIMETRY
(2023)
Article
Environmental Sciences
Malgorzata Kasprzak, Federico A. Geser, Malgorzata Sliz, Eduardo Yukihara, Sabine Mayer
Summary: The Calibration Laboratory at the Paul Scherrer Institute is responsible for calibrating and verifying radiation protection instruments and dosemeters. The laboratory is involved in research and development projects to meet the increasing calibration needs and comply with new regulations.
RADIATION PROTECTION DOSIMETRY
(2023)
