Article
Chemistry, Multidisciplinary
Chryzel Angelica B. Gonzales, Ryogo Ajimura, Hiroshi Yasuda
Summary: This study examined the effects of L(+) -ascorbic acid on ESR signals from fingernails and found that it efficiently removes disturbing signals caused by storage conditions, improving the reliability of radiation dosimetry.
APPLIED SCIENCES-BASEL
(2022)
Article
Chemistry, Physical
Jakob G. Hjorringgaard, Arne Miller, Claus E. Andersen, Dominique Cloetta, Willi Wandfluh, Alan Tallentire
Summary: In this study, the radiation response of Bacillus pumilus spores exposed to different radiation qualities was investigated, and it was found that the radiation resistance of the spores is independent of beam quality.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Biology
Seiko Hirota, Chryzel Angelica B. Gonzales, Hiroshi Yasuda
Summary: The study found that there is a linear dose response to X-rays and gamma-rays in fingernails, with minimal impact from secondary electrons and little inter-individual variation in sensitivity. Signal intensities fluctuate in measurements depending on the sample, with an average fluctuation corresponding to 1.7 Gy and a standard deviation of 1.3 Gy.
JOURNAL OF RADIATION RESEARCH
(2021)
Article
Public, Environmental & Occupational Health
Agnieszka Marciniak, Malgorzata Juniewicz, Bartlomiej Ciesielski, Anita Prawdzik-Dampc, Jakub Karczewski
Summary: This article presents the results of follow-up studies on samples of watch glass within the framework of the international intercomparison dosimetry project RENEB ILC 2021. Three methods of dose reconstruction based on EPR measurements are introduced and their reliability and accuracy are evaluated. The added dose&heating method is found to be the only applicable method in real scenarios, highlighting its importance for potential radiation accidents involving glass.
FRONTIERS IN PUBLIC HEALTH
(2022)
Article
Chemistry, Physical
Hasan Tuner
Summary: The potential of commonly used mineral eyeglass lenses for accidental and retrospective EPR dosimetry was investigated. Two different types of mineral crown eyeglass lenses, white and photochromic glasses, were studied. The differences in dosimetric properties between coated and uncoated lenses were also examined. While the investigated lenses showed distinguishable EPR signals at high radiation doses (>500 Gy), only the white-coated mineral eyeglass lenses exhibited distinguishable EPR signals below 10 Gy. Although the radiation-induced radicals faded quickly within three weeks, these lenses have the potential for accidental dose determination.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Chemistry, Physical
Nilo F. Cano, T. K. Gundu Rao, Jorge S. Ayala Arenas, Henry S. Javier-Ccallata, S. Watanabe
Summary: In this study, anhydrite was investigated as a dosimeter for low and high gamma doses using EPR. The EPR spectrum revealed signals from (SO3)(-), (SO4)(-) radicals and O center. The dose response of (SO3)(-) and (SO4)(-) was found to be linear, while the O center exhibited a supra-linear response in the higher dose range.
RADIATION PHYSICS AND CHEMISTRY
(2021)
Article
Nuclear Science & Technology
Jolan E. Tano, Hiroshi Yasuda, Chryzel Angelica B. Gonzales
Summary: The study found that heat influences the ESR spectra of fingernails, leading to changes in the spectra's visual shape when heated above 100?. The heat-induced signal decays within a few days and can be easily removed with water, while the radiation-induced signal remains stable up to 160?. The heat-induced signal and radiation-induced signal in the fingernail spectra may overlap but are likely independent of each other.
RADIATION MEASUREMENTS
(2022)
Article
Engineering, Electrical & Electronic
Yasuhiro Koguchi, Go Okada, Satoshi Ueno, Chiaki Sawai, Hidehito Nanto
Summary: Recent research has found that CaSO4 exhibits remarkable radiophotoluminescence (RPL) properties without intentional addition of impurities. ESR measurements were conducted to identify the defect species responsible for RPL and determine the luminescence's origin. The results showed the presence of various impurities, including Al2O3, Mn2+, P, and Si, in CaSO4, which may affect the radiation sensitivity. Hence, deliberate addition of specific elements is suggested to control the RPL properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Engineering, Biomedical
Sebastian Hoefel, Michael Stehle, Felix Zwicker, Michael K. Fix, Malte Drescher
Summary: In EPR dosimetry, uncertainty analysis was conducted for doses ranging from 1 to 70 Gy using AL and LFM pellets. LFM pellets demonstrated lower dose uncertainties compared to AL pellets, making them more suitable for applications in radiotherapy.
PHYSICS IN MEDICINE AND BIOLOGY
(2021)
Article
Multidisciplinary Sciences
Junwang Guo, Xiaoxiao Luan, Ye Tian, Lei Ma, Xiaoguang Bi, Jierui Zou, Guofu Dong, Ye Liu, Yonggang Li, Jing Ning, Ke Wu
Summary: A new type of X-band EPR resonant cavity and an in vivo fingernail EPR spectrometer were designed for assessing the radiation dose of the victims in radiation accidents. The instrument was capable of detecting radiation-induced signals in irradiated fingernails and estimating emergency doses accurately.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Physical
Y. Karakirova, R. Mladenova
Summary: This study investigates the use of mixed materials consisting of sucrose and ascorbic acid, sucrose and cysteine, and sucrose and diphenylamine as dosimeters. The results show that although these mixed materials have lower sensitivity, they can still be used for dosimetric purposes.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Review
Biochemistry & Molecular Biology
Vasily V. Ptushenko, Vladimir N. Linev
Summary: In the early 1980s, a series of benchtop specialized EPR spectrometers appeared in the USSR, which were quickly adopted in science, medicine, and various technical and economic fields. These unique devices became the only mass-produced MR spectrometers in the former USSR after its collapse.
Article
Chemistry, Inorganic & Nuclear
Junwang Guo, Lei Ma, Xiaoguang Bi, Guofu Dong, Yonggang Li, Jing Ning, Ke Wu
Summary: The newly developed TE101 mode rectangle EPR cavity is designed for X-band in vivo EPR tooth dosimetry, with a sample detection aperture on its surface. Characteristics were evaluated using DPPH and intact human incisor samples, showing remarkable radiation induced signals from EPR spectrum of teeth irradiated at 1Gy-8Gy. In vivo measurements on rats confirmed its potential application for in vivo tooth dosimetry.
APPLIED RADIATION AND ISOTOPES
(2021)
Article
Materials Science, Multidisciplinary
N. Hajiloo, F. Ziaie
Summary: In this experimental work, the EPR signal intensity of hydroxyapatite (HAP) samples was studied from a dosimetric standpoint. HAP samples were prepared in different ways and irradiated with various absorbed doses. The EPR signal intensity of the samples was tested in air at room temperature, showing a linear relationship with dose up to 10 kGy. The findings highlight the importance of fabrication procedure, particle size, carbon impurity, and morphology in determining the EPR signal intensity, with a sample having a grain size of approximately 30 nm and a carbon impurity of 0.47% exhibiting the highest EPR signal intensity with dose.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Physical
Ahmed Mohamed Maghraby, Ahmed Soltan Monem, Hoda Mohamed Eissa
Summary: The use of electron paramagnetic resonance (EPR) in radiation dosimetry allows for more accurate and reliable assessment of radiation doses. The search for new dosimeter materials continues to overcome limitations of current ones. This study presents potassium hydrogen tartrate as a new EPR dosimeter material and investigates its radiation dose dependency, the impact of changes in microwave power and modulation amplitude on peak-to-peak intensity. The response of potassium hydrogen tartrate to gamma radiation is examined in two ranges, with calibration curves plotted and compared to alanine. The time dependence of radiation-induced radicals' EPR spectra is monitored over short term (10 hours) and long-term (28 days) post-irradiation.
RADIATION PHYSICS AND CHEMISTRY
(2023)
Article
Meteorology & Atmospheric Sciences
Melody Pallu, Sebastien Celestin, Francois Trompier, Michel Klerlein
Summary: Terrestrial Gamma Ray Flash (TGF) sources at altitudes close to commercial flight altitudes pose potential radiation exposure risk to aircraft passengers and crews. Current aircrew protection regulations do not consider TGF radiation due to lack of data on dose levels and aircraft exposure probability. Calculations show high doses of radiation from TGF electron sources may exceed safety limits.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Physics, Atomic, Molecular & Chemical
Nicolas Tkatchenko, Alexander Romanyukha, Ricardo Reyes, Steven G. Swarts, Didier Gourier, Francois Trompier
Summary: Human nails have been studied for their potential use in dosimetry using EPR signals induced by ionizing radiation. However, no fully validated protocol for retrospective dose measurement has been developed. The complexity of the EPR spectrum and the overlap between radiation-induced signals and background signals pose a major challenge. Detailed characterization of background signals is required to measure the radiation-induced signals accurately.
APPLIED MAGNETIC RESONANCE
(2022)
Editorial Material
Biology
Harold M. Swartz, Ruth C. Wilkins, Elizabeth Ainsbury, Matthias Port, Ann Barry Flood, Francois Trompier, Laurence Roy, Steven G. Swarts
INTERNATIONAL JOURNAL OF RADIATION BIOLOGY
(2022)
Article
Chemistry, Physical
Oswaldo Baffa, Patricia Nicolucci, Marcos Candeias, Francois Trompier, Angela Kinoshita
Summary: This study used alanine/electron spin resonance dosimetry to assess photon doses to electronic equipment and cables at the Angra 1 nuclear power plant in Brazil during an operation cycle. The influence of neutron radiation was also evaluated, and the results showed that alanine dosimetry is capable of operating over a wide dose range. The study suggests that alanine/ESR dosimetry can be used as part of the Environmental Qualification Program of Electrical Equipment in a nuclear power plant.
RADIATION PHYSICS AND CHEMISTRY
(2022)
Article
Geography, Physical
Davinia Moreno, Ana Isabel Ortega, Christophe Falgueres, Qingfeng Shao, Olivier Tombret, Asier Gomez-Olivencia, Arantza Aranburu, Francois Trompier, Jose Maria Bermudez de Castro, Eudald Carbonell, Juan Luis Arsuaga
Summary: The Galeria de las Estatuas is a Mousterian site located in the karstic system of Sierra de Atapuerca, Spain. It has yielded a large number of lithic artefacts, faunal remains, Neanderthal foot phalanx, and mitochondrial and nuclear DNA. With various dating methods, the site has been dated to approximately 45ka cal BP, and the sediment containing Mousterian lithic artefacts, faunal, and human remains is estimated to have been deposited during the second part of MIS5.
QUATERNARY GEOCHRONOLOGY
(2022)
Article
Radiology, Nuclear Medicine & Medical Imaging
A. M. M. Leite, M. Cavallone, M. G. Ronga, F. Trompier, Y. Ristic, A. Patriarca, L. De Marzi
Summary: To assess the suitability of standard clinical dosimeters, the ion collection efficiency of several commercially available air-vented ionization chambers (IC) was evaluated in both conventional and very-high dose rate (VHDR) proton irradiation conditions. The results showed that the ion recombination correction factors for most detectors were below 2% at VHDRs, indicating comparable collection efficiency to conventional dose rates. However, the Nano Razor exhibited higher recombination correction factors at VHDRs, suggesting a reduction in collection efficiency at higher dose rates.
PHYSICA MEDICA-EUROPEAN JOURNAL OF MEDICAL PHYSICS
(2023)
Article
Physiology
Manon Guillou, Bruno L'Homme, Francois Trompier, Gaetan Gruel, Yolanda Prezado, Morgane Dos Santos
Summary: Interventional radiology has become an essential tool for treatment or diagnosis, but the lack of knowledge about the radiobiological consequences of low-energy X-rays used in these practices has led to uncertainties in prognosis. In order to improve radiation protection and predict complications, a new preclinical mouse model was implemented to mimic radiological burn in interventional radiology. Experimental and Monte Carlo simulation methods were used to characterize the dose deposition in different tissues. The results showed the heterogeneity of dose deposition and the influence of tissue density on the characteristics of secondary electrons.
FRONTIERS IN PHYSIOLOGY
(2022)
Article
Physics, Multidisciplinary
Paola Fattibene, Francois Trompier, Celine Bassinet, Bartlomiej Ciesielski, Michael Discher, Jonathan Eakins, Chryzel Angelica B. Gonzales, Christelle Huet, Alexander Romanyukha, Clemens Woda, Malgorzata Juniewicz, Hyoungtaek Kim, Jungil Lee, Agnieszka Marciniak, Sergey Sholom, Hiroshi Yasuda
Summary: This article aims to provide an overview of the questions, challenges, and solutions regarding retrospective dosimetry in acute accidental exposures using physical methods such as electron paramagnetic resonance, thermoluminescence, and optically stimulated luminescence in biological tissues and inert materials. As research on emergency response methods faces increasing difficulties in terms of financial and human resources in many countries, it is crucial to prioritize research and focus on cost-effective paths. The paper intends to stimulate discussion in the scientific community and encourage collaboration among laboratories towards goals that address the real needs in retrospective dosimetry for acute exposures.
Article
Nuclear Science & Technology
Maha Bouhadida, Asmae Mazzi, Mariya Brovchenko, Thibaut Vinchon, Mokhtar Z. Alaya, Wilfried Monange, Francois Trompier
Summary: In this study, artificial neural networks are used to unfold neutron spectra from measured energy-integrated quantities. These spectra are important for calculating absorbed dose and kerma for radiation protection and nuclear safety. The architectures used are inspired by convolutional neural networks, with one architecture using residual transposed convolution blocks and the other being a modified version of the U-net architecture. A large and balanced simulated dataset is used to train the architectures effectively, considering realistic physical constraints. The results demonstrate high accuracy in predicting neutron spectra from thermal to fast spectrum, with dataset processing, attention to performance metrics, and hyperoptimization contributing to the robustness of the architectures.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2023)
Article
Meteorology & Atmospheric Sciences
M. Pallu, S. Celestin, F. Trompier, M. Klerlein
Summary: Terrestrial gamma ray flashes (TGFs) are bursts of high-energy photons produced in thunderstorms, while electrons deliver high doses in a compact area around the TGF source. Previous studies have shown that the photon doses from TGFs are sufficiently low to be negligible for radiation exposure during flights. In this work, the upper bound probability of a commercial flight being hit by the electron beam of a TGF is estimated, and the results suggest that the probability is very low for the total air traffic.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Review
Biology
Francois Trompier, Larry A. Dewerd, Yannick Poirier, Morgane Dos Santos, Ke Sheng, Keith A. Kunugi, Thomas A. Winters, Andrea L. Dicarlo, Merriline Satyamitra
Summary: The cornerstones of science advancement are rigor, reproducibility, and unbiased reporting in scientific research. For radiation research, it is important to accurately describe experimental details and irradiation protocols for precise and reproducible dosimetry. However, many institutions conducting radiation biology research lack sufficient details in reporting their protocols, hindering balanced review and replication of experiments. To address this, experts have outlined minimum reporting standards for preclinical irradiators and dosimetry.
INTERNATIONAL JOURNAL OF RADIATION BIOLOGY
(2023)
Article
Environmental Sciences
Veronique Menard, Yoann Ristic, Francois Trompier
Summary: This study compared alanine dosimetry with ionisation chamber measurements for whole-body mouse irradiation and found reproducibility issues caused by cable twisting and irradiation of the ionisation chamber connector. Results showed a difference of up to 8.4% between alanine dosimetry and ionisation chamber measurements, and the influence of the number of animals in the sterile box on whole-body dose was found to be less than 2%.
RADIATION PROTECTION DOSIMETRY
(2023)
Editorial Material
Environmental Sciences
Shin Toyoda, Ann B. Flood, Tomisato Miura, Francois Trompier, Ruth Wilkins
RADIATION PROTECTION DOSIMETRY
(2023)
Editorial Material
Biology
Yannick Poirier, Larry A. DeWerd, Francois Trompier, Morgane Dos Santos, Ke Sheng, Keith Kunugi, Merriline M. Satyamitra, Andrea L. DiCarlo, Thomas A. Winters
RADIATION RESEARCH
(2023)
Article
Environmental Sciences
H. M. Swartz, S. G. Swarts, E. Ainsbury, R. C. Wilkins, M. Port, F. Trompier, A. B. Flood, L. Roy
Summary: There are similarities in the responses needed for managing COVID-19 and radiation injuries, as they both involve identifying and dealing with exposed individuals. Biodosimetry plays a crucial role in both situations.
