Radiation Measurements最新文献

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Simulation and measurements of HDR brachytherapy source dosimetric parameters using a fiber-optic dosimeter 用光纤剂量计模拟和测量HDR近距离放射治疗源剂量参数
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-06-10 DOI: 10.1016/j.radmeas.2025.107469
Khalid Alhamad , Hasham Ahmed , Dean Cutajar , Joel Poder , Anatoly Rosenfeld , Enbang Li
{"title":"Simulation and measurements of HDR brachytherapy source dosimetric parameters using a fiber-optic dosimeter","authors":"Khalid Alhamad ,&nbsp;Hasham Ahmed ,&nbsp;Dean Cutajar ,&nbsp;Joel Poder ,&nbsp;Anatoly Rosenfeld ,&nbsp;Enbang Li","doi":"10.1016/j.radmeas.2025.107469","DOIUrl":"10.1016/j.radmeas.2025.107469","url":null,"abstract":"<div><div>The aim of this study is to evaluate the feasibility of using CsI(Tl)-based fiber-optic dosimetry system for TG-43 dosimetric characterization of the Flexisource <sup>192</sup>Ir HDR brachytherapy source. The investigation focuses on anisotropy and radial dose function measurements and assesses the impact of fluorescence and Cherenkov radiation on signal accuracy, with validation through TOPAS Monte Carlo simulations.</div><div>Thallium Doped-Cesium Iodide (CsI(Tl)) scintillation crystals were used within a custom-designed PMMA phantom. The experiment, conducted with a Flexitron afterloader and <sup>192</sup>Ir Flexisource, involved measurements at distances of 1.5–6 cm and polar angles of 20°–155°, with increments matching those in the published studies.</div><div>Comprehensive dosimetric data were collected, revealing the influence of fluorescence and Cherenkov radiation on anisotropy function measurements. The radial dose function showed good agreement with simulation, with minor deviations attributed to limitations in the treatment planning. TOPAS Monte Carlo simulations demonstrated consistent agreement with experimental results, yielding a maximum absolute difference of 0.035 in the experimental data and a maximum deviation of 2.6% in anisotropy function validation against published reference data, further confirming the reliability of both the experimental approach and the simulation model.</div><div>These findings underscore the importance of accounting for fluorescence and Cherenkov radiation in detector signal response. Unlike earlier approaches that primarily focused on signal removal or hardware suppression techniques, this study demonstrates the integration of these contributions directly into calibration models to improve dosimetric precision. By refining these calibration methods, fiber-optic detectors may be further developed into simple, accurate, and clinically viable tools for brachytherapy applications.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"187 ","pages":"Article 107469"},"PeriodicalIF":1.6,"publicationDate":"2025-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144271589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of an independent and interactive compton camera system using dual arrays of single scintillator-based camera modules 开发一个独立的和交互式的康普顿相机系统,使用双阵列的单闪烁基于相机模块
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-06-09 DOI: 10.1016/j.radmeas.2025.107480
Hyounggun Lee , Seonghee Choi , Sangwoo Han , Wonho Lee
{"title":"Development of an independent and interactive compton camera system using dual arrays of single scintillator-based camera modules","authors":"Hyounggun Lee ,&nbsp;Seonghee Choi ,&nbsp;Sangwoo Han ,&nbsp;Wonho Lee","doi":"10.1016/j.radmeas.2025.107480","DOIUrl":"10.1016/j.radmeas.2025.107480","url":null,"abstract":"<div><div>An integrated dual-module Compton camera system (IDM-CCS) was developed to address the limitations of conventional Compton cameras, such as restricted field-of-view (FOV) and low intrinsic detection efficiency. The IDM-CCS, which comprises two single scintillator-based modules, operates both independently and interactively, using the multi-system weighted list-mode maximum likelihood expectation maximization (LM-MLEM) algorithms for enhanced image reconstruction. In the interactive (coincidence) mode, the first and second reactions occurred in different detector modules. This enabled the adjustment of the lever arm distance, which was the distance between the first and second reactions, by modifying the detector geometry; the experiments were performed at various lever arm distances.</div><div>A minimum resolvable angle assessment showed an improvement in the case of single scintillator modules, with a distinct source separation at 24°. The intrinsic imaging efficiency for the axial radiation source direction was determined to be 2.1 %, 1.3 %, and 0.8 % for short, medium, and long lever arm distances, respectively. Meanwhile, for the lateral direction, the efficiency remained stable at approximately 1.3 % across all lever arm distances. Field usability tests confirmed that when the pixel resolution of the IDM-CCS was aligned with that of standard cameras, such as those used in smartphones, the positions of the two different radiation sources were accurately represented. The study findings can offer guidance for optimizing detectors with similar structures, thereby enhancing their performance in various field applications.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"187 ","pages":"Article 107480"},"PeriodicalIF":1.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144254906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel deep learning-based artificial intelligence method for automated apatite fission-track identification 一种基于深度学习的人工智能磷灰石裂变径迹自动识别方法
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-06-09 DOI: 10.1016/j.radmeas.2025.107482
Rui Huang , Ruxin Ding , Canjia Chen
{"title":"A novel deep learning-based artificial intelligence method for automated apatite fission-track identification","authors":"Rui Huang ,&nbsp;Ruxin Ding ,&nbsp;Canjia Chen","doi":"10.1016/j.radmeas.2025.107482","DOIUrl":"10.1016/j.radmeas.2025.107482","url":null,"abstract":"<div><div>Fission-track dating is a widely used thermochronological technique. The traditional manual identification of fission tracks under a microscope is time-consuming and susceptible to counting errors. A novel deep learning-based method was proposed to detect fission tracks automatically. Our method consists of the following steps. 1) Utilizing the Mask Region-based Convolutional Neural Network algorithm to locate fission tracks and extract their boundary coordinates. 2) Using ellipses to fit the fission tracks’ boundary coordinates. 3) Analyzing the fitted ellipse parameters to handle overlapping tracks. 55 spontaneous fission-track images were utilized for training and 15 images for testing. The algorithm provided excellent detection performance for most samples, with few omission and commission errors. These results indicate that the method has significant potential for automated fission-track identification and distinguishes between overlapping and single tracks.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"187 ","pages":"Article 107482"},"PeriodicalIF":1.6,"publicationDate":"2025-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144261795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Influence of field positioning errors on beam characteristics and dose parameters in small field radiation therapy 场定位误差对小场放射治疗光束特性和剂量参数的影响
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-06-05 DOI: 10.1016/j.radmeas.2025.107458
A. El Hamli , A. Moussa , Y. Tayalati , N. Chafi , M. Zerfaoui
{"title":"Influence of field positioning errors on beam characteristics and dose parameters in small field radiation therapy","authors":"A. El Hamli ,&nbsp;A. Moussa ,&nbsp;Y. Tayalati ,&nbsp;N. Chafi ,&nbsp;M. Zerfaoui","doi":"10.1016/j.radmeas.2025.107458","DOIUrl":"10.1016/j.radmeas.2025.107458","url":null,"abstract":"<div><div>In radiation therapy, accidental displacement of the treatment field from the central axis can occur, leading to deviations from the intended dose distribution, especially for small treatment fields due to associated challenges. This study investigates the influence of small field displacements on radiation beam characteristics and dosimetric parameters using a validated Monte Carlo simulation of an Elekta Synergy linear accelerator with an MLCi2 multi-leaf collimator. For the investigated field sizes, simulated and measured dose distributions showed good agreement based on statistical tests and quality factors. Depth dose and lateral dose profiles were compared for various displacements along the X-axis relative to the central axis. A significant decrease exceeding 27% in the absorbed dose was observed due to field displacement, with the deviation being more pronounced in the region of the maximum dose and decreasing with depth. Despite displacement, the relative dose distributions exhibited a consistent pattern. An overall reduction in the number of particles reaching the phantom surface was observed, following a second-order polynomial function with displacement, while maintaining a consistent dose deposition manner. The energy spectrum showed a global decrease across all energies, but with minimal changes (<span><math><mrow><mo>&lt;</mo><mn>1</mn><mo>.</mo><mn>1</mn><mtext>%</mtext></mrow></math></span>) in the average and maximum energies. Larger discrepancies were observed for the minimum energy, attributed to statistical fluctuations inherent to Monte Carlo simulations.</div><div>In conclusion, small field displacements do not significantly impact the overall dose deposition pattern. The observed reductions in energy spectrum and absorbed dose can be compensated based on pre-quantified relationships with the estimated displacement, enabling accurate dose delivery even in the presence of small field misalignment.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"187 ","pages":"Article 107458"},"PeriodicalIF":1.6,"publicationDate":"2025-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144280607","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Radon assessment model using CFD simulation 基于CFD模拟的氡评价模型
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-06-03 DOI: 10.1016/j.radmeas.2025.107478
Maria Rita Silva Araujo , José Araújo dos Santos Júnior , Zahily Herrero Fernández , Romilton dos Santos Amaral , Jussiê Soares da Rocha , Abel Gámez Rodríguez , Josineide Marques do Nascimento Santos , Marcela Ferreira Marques de Oliveira , Leandro Moreira da Silva , Andrey José Isidoro de Araújo Rodrigues Azevedo , Leorlen Yunier Rojas Mazaira
{"title":"Radon assessment model using CFD simulation","authors":"Maria Rita Silva Araujo ,&nbsp;José Araújo dos Santos Júnior ,&nbsp;Zahily Herrero Fernández ,&nbsp;Romilton dos Santos Amaral ,&nbsp;Jussiê Soares da Rocha ,&nbsp;Abel Gámez Rodríguez ,&nbsp;Josineide Marques do Nascimento Santos ,&nbsp;Marcela Ferreira Marques de Oliveira ,&nbsp;Leandro Moreira da Silva ,&nbsp;Andrey José Isidoro de Araújo Rodrigues Azevedo ,&nbsp;Leorlen Yunier Rojas Mazaira","doi":"10.1016/j.radmeas.2025.107478","DOIUrl":"10.1016/j.radmeas.2025.107478","url":null,"abstract":"<div><div>Radiometric studies on the influence of radon and its progeny have been intensified worldwide. Radon emanates from soil, rocks, and building materials, concentrating in enclosed or poorly ventilated areas. Inhaling this gas can harm human health due to its alpha emission and short-lived decay products, which can be deposited in lung tissues. Simulations with Computational Fluid Dynamics (CFD) to study radon distribution in indoor environments is quite advantageous in terms of cost and response time compared to conventional experiments, allowing a better understanding of radon levels dispersed in the air and enabling the estimation of short and long-term individual exposure. The study aimed to determine the behavior of radon in a controlled environment with a high radioactive background, using CFD modeling through Ansys CFX software. The investigation was conducted in the sample storage room of the Radioecology Group, belonging to the Department of Nuclear Energy of the Federal University of Pernambuco. This room was selected due to its high radioactive background, which was caused by the presence of environmental radioactive samples. In the study, a physical-mathematical model was constructed, and a 3D graphic platform was generated, confirming the dispersion of this radionuclide in the sampling environment. The simulation results were compared with those obtained experimentally using the AlphaGUARD detector. As theoretically predicted, the CFD simulation with ANSYS CFX indicated that the areas with the highest radon concentration are close to radioactive sources. It is worth noting that the developed model has a qualitative character, allowing the analysis of the radon dispersion tendency in the environment and identifying regions where the gas accumulates. Although it did not accurately reproduce the absolute concentration values measured experimentally, the model proved adequate to represent the spatial distribution of radon under controlled conditions and is viable for validating behavior.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"187 ","pages":"Article 107478"},"PeriodicalIF":1.6,"publicationDate":"2025-06-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144230900","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Thoron exhalation rate measurement – findings from a large worldwide intercomparison study 呼吸率测量-来自一项大型全球比较研究的结果
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-05-31 DOI: 10.1016/j.radmeas.2025.107471
G. de With , G. Venoso , A. Maiorana , C. Di Carlo , O. Meisenberg , Q. Guo , M. Janik , E.D. Nugraha , O.M. Bobbo , C. Kranrod , M. Hosoda , S. Tokonami , B.K. Sahoo , S.D. Kanse , J. Tschiersch
{"title":"Thoron exhalation rate measurement – findings from a large worldwide intercomparison study","authors":"G. de With ,&nbsp;G. Venoso ,&nbsp;A. Maiorana ,&nbsp;C. Di Carlo ,&nbsp;O. Meisenberg ,&nbsp;Q. Guo ,&nbsp;M. Janik ,&nbsp;E.D. Nugraha ,&nbsp;O.M. Bobbo ,&nbsp;C. Kranrod ,&nbsp;M. Hosoda ,&nbsp;S. Tokonami ,&nbsp;B.K. Sahoo ,&nbsp;S.D. Kanse ,&nbsp;J. Tschiersch","doi":"10.1016/j.radmeas.2025.107471","DOIUrl":"10.1016/j.radmeas.2025.107471","url":null,"abstract":"<div><div>A global intercomparison study was conducted to measure the thoron (<sup>220</sup>Rn) exhalation rate from two building materials, with participation from five European laboratories and three Asian laboratories. The test samples—phosphogypsum and unfired clay—were circulated among the laboratories using a sequential proficiency testing scheme. The assigned values and their uncertainties were determined through recommended robustness analysis. For comparison, the classical method, which uses the arithmetic mean of all participants' results, was also applied. Individual measurement results were evaluated for bias, precision, and proficiency in accordance with ISO 13528:2022.</div><div>The assigned exhalation rates were (0.39 ± 0.15) Bq m<sup>−2</sup> s<sup>−1</sup> for phosphogypsum and (0.53 ± 0.15) Bq m<sup>−2</sup> s<sup>−1</sup> for unfired clay. Z-scores were below 3 for seven of the nine methods used. Bias (<em>R</em><sub><em>b</em></sub>) and precision (<em>P</em>) parameters were within 50 %, except in one case. Laboratories provided details on Type A and Type B uncertainties, revealing that detector calibration uncertainty was the dominant factor in most cases.</div><div>These findings underscore the need for more robust calibration methods to improve the accuracy of thoron measurements. The development of a harmonised standard would greatly enhance the consistency of thoron exhalation rate measurements. Such a standard should provide guidance on detector calibration, as well as key factors such as climate conditions during sample preparation and testing, procedures for determining exhalation rates and their uncertainties, and considerations for material aging and spatial variations.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"187 ","pages":"Article 107471"},"PeriodicalIF":1.6,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144230901","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Multiple Coulomb scattering in acrylic of a 221.3 MeV therapeutic proton beam 221.3 MeV治疗质子束在丙烯酸中的多重库仑散射
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-05-31 DOI: 10.1016/j.radmeas.2025.107470
Skylar Clymer , Lukas Domer , Arda Gulser , Evrim Gulser , Ricardo Alarcon , Paul Mulqueen , Stephen Sledge , Martin Bues
{"title":"Multiple Coulomb scattering in acrylic of a 221.3 MeV therapeutic proton beam","authors":"Skylar Clymer ,&nbsp;Lukas Domer ,&nbsp;Arda Gulser ,&nbsp;Evrim Gulser ,&nbsp;Ricardo Alarcon ,&nbsp;Paul Mulqueen ,&nbsp;Stephen Sledge ,&nbsp;Martin Bues","doi":"10.1016/j.radmeas.2025.107470","DOIUrl":"10.1016/j.radmeas.2025.107470","url":null,"abstract":"<div><div>Measurements of multiple Coulomb scattering (MCS) distributions for 221.3 MeV therapeutic protons are presented using a novel detector system comprised of a thin scintillator, a pellicle mirror, and a digital camera. The MCS distributions were characterized for three acrylic phantoms of varying lengths and for two biological density-equivalent phantoms simulating bone and muscle. Additionally, beam profiles were measured across an energy range of 80.3–221.3 MeV in 20 MeV increments. The observed energy dependence of the photon yields is consistent with the tabulated stopping power values. The experimental results are benchmarked against Geant4 simulations, demonstrating consistent agreement and validating the capability of the detector system for radiology measurements.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"187 ","pages":"Article 107470"},"PeriodicalIF":1.6,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144230898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Evaluation of photon-counting capability for silicon photomultiplier-based photon-counting CT using Ce-doped SrHfO3 scintillator 利用掺铈SrHfO3闪烁体评价硅光电倍增管光子计数CT的光子计数能力
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-05-31 DOI: 10.1016/j.radmeas.2025.107456
Daichi Sato , Shunsuke Kurosawa , Koichi Harata , Kana Fujioka , Akihiro Yamaji , Yusuke Urano , Makoto Arimoto , Fitri Lucyana , Takahiro Tomoda
{"title":"Evaluation of photon-counting capability for silicon photomultiplier-based photon-counting CT using Ce-doped SrHfO3 scintillator","authors":"Daichi Sato ,&nbsp;Shunsuke Kurosawa ,&nbsp;Koichi Harata ,&nbsp;Kana Fujioka ,&nbsp;Akihiro Yamaji ,&nbsp;Yusuke Urano ,&nbsp;Makoto Arimoto ,&nbsp;Fitri Lucyana ,&nbsp;Takahiro Tomoda","doi":"10.1016/j.radmeas.2025.107456","DOIUrl":"10.1016/j.radmeas.2025.107456","url":null,"abstract":"<div><div>Cross-sectional images were obtained using photon-counting computed tomography (PCCT) for medical applications, incorporating a silicon photomultiplier (SiPM) and Ce-, Mg- and Al-codoped SrHfO<sub>3</sub> transparent-ceramic scintillator (Mg/Al/Ce:SHO). A maximum counting rate of 8<!--> <!-->MHz was achieved with our PCCT system equipped with this scintillator. Enhancing the maximum counting rate is crucial for short-time imaging, and further advancements in counting capability are essential for clinical applications. The Mg/Al/Ce:SHO scintillator, which has a shorter decay time (<span><math><mo>∼</mo></math></span>20<!--> <!-->ns) and higher density (7.6<!--> <!-->g/cm<sup>3</sup>) compared to the Ce:(Y, Gd)<sub>3</sub>(Al, Ga)<sub>5</sub>O<sub>12</sub> scintillator used in earlier PCCT systems, was prepared via spark plasma sintering and integrated into the PCCT. The maximum counting rate was estimated by varying the intensity of incident X-ray photons using an X-ray tube and applying a non-paralyzable dead-time model, yielding approximately 8<!--> <!-->MHz–double the photon-counting capability of our previous system. Additionally, static phantom imaging with iodine and gadolinium contrast agents was performed at X-ray tube current of 0.5, 1.0 and 2.0 mA. The image quality remained consistent within the standard deviation of CT values despite increasing the tube current. These findings suggest that the Mg/Al/Ce:SHO scintillator offers superior potential for clinical PCCT applications compared to conventional systems.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"187 ","pages":"Article 107456"},"PeriodicalIF":1.6,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144230899","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Rapid detection of accidental hand exposure using radiophotoluminescence glass (FD-7) and an overhead scanning system 使用放射光致发光玻璃(FD-7)和头顶扫描系统快速检测手部意外暴露
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-05-23 DOI: 10.1016/j.radmeas.2025.107468
Hiroshi Yasuda , Ryuto Inobe , Sophia E. Welti , Yuka Yanagida , Yasuhiro Koguchi
{"title":"Rapid detection of accidental hand exposure using radiophotoluminescence glass (FD-7) and an overhead scanning system","authors":"Hiroshi Yasuda ,&nbsp;Ryuto Inobe ,&nbsp;Sophia E. Welti ,&nbsp;Yuka Yanagida ,&nbsp;Yasuhiro Koguchi","doi":"10.1016/j.radmeas.2025.107468","DOIUrl":"10.1016/j.radmeas.2025.107468","url":null,"abstract":"<div><div>Workers who use high-intensity radiation sources on a daily basis are at risk of accidently exposing their fingers to high levels of radiation, which can cause acute effects such as skin damage. For the prompt detection of such unexpected severe exposure, we attempted to use the radiochromic reaction of radiophotoluminscence (RPL) glass that can be worn on the fingers with a common overhead scanning system. A plate-shaped RPL glass (FD-7) with the size of 8.0 × 8.0 × 1.5 mm<sup>3</sup> used in a commercially available ring-type glass dosimeter was irradiated with X-rays (160 kV, 6.3 mA) at 80–400 Gy, for which RPL measurements were difficult. Radiochromic reactions of FD-7 were visually confirmed on a tracing light board, and the RGB images captured at certain time intervals using an overhead scanner (OHS) were analyzed using image processing software (ImageJ). In addition, time changes in the post-irradiation absorbance spectra were measured using a UV–visible spectrophotometer. The post-irradiation brownish coloration of FD-7 was detected by the naked eye at all doses (≥80 Gy). From the inverted images acquired by the OHS, the color intensity of the blue channel showed the most preferable dose response covering the target dose range. Interestingly, the blue color intensity stabilized immediately after X-ray irradiation without a preheating procedure, which is generally required in RPL glass dosimetry. The spectrophotometry data confirmed the results obtained using the overhead scanning system; the absorbance in the blue color range (430–490 nm) slightly reduced during the period of post-irradiation RPL build-up. These findings highlight the practical advantages of this novel method for monitoring hand exposure.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"186 ","pages":"Article 107468"},"PeriodicalIF":1.6,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138640","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Quantitative alpha spectra isotope identification based on deep learning method and Monte Carlo modeling 基于深度学习方法和蒙特卡罗建模的定量α光谱同位素识别
IF 1.6 3区 物理与天体物理
Radiation Measurements Pub Date : 2025-05-21 DOI: 10.1016/j.radmeas.2025.107460
Qiang Yan , HaiTao Zhang , Jinfeng Huang , Wenjun Xiong , Guobin Huang , Lei Dai , Zhengxin Wu , Guoqing Liu
{"title":"Quantitative alpha spectra isotope identification based on deep learning method and Monte Carlo modeling","authors":"Qiang Yan ,&nbsp;HaiTao Zhang ,&nbsp;Jinfeng Huang ,&nbsp;Wenjun Xiong ,&nbsp;Guobin Huang ,&nbsp;Lei Dai ,&nbsp;Zhengxin Wu ,&nbsp;Guoqing Liu","doi":"10.1016/j.radmeas.2025.107460","DOIUrl":"10.1016/j.radmeas.2025.107460","url":null,"abstract":"<div><div>It is essential to identify radioactive isotopes contained in samples quantitively for environment radiation contamination monitoring. Energy-spectra-based nuclide identification is the most commonly used method in environmental radiation measurement and has been widely used for gamma ray emitting isotopes. In this work, a complete procedure of quantitative alpha spectra analysis and alpha isotope identification based on deep learning method was proposed and it was proved effective and feasible to use Monte Carlo simulation in deep learning model development. Deep learning model with 6 hidden layers (about 0.7million trainable parameters) was developed and implemented based on Keras framework in Python. Instead of complicated spectrum feature extraction algorithm, proposed deep learning model used spectrum data as input directly and could output a weight vector of nuclides with elements - -having - meaning of the percentage content of every nuclide. To train the proposed model, huge number of training spectra were needed and it was not possible to prepare all needed data by measurement. In this study, Monte Carlo simulation was used as an alternative method to produce massive alpha spectra by mixing basic spectrumof single nuclide. Based on the setups of commercially available Canberra alpha meter, a set of alpha spectra from single nuclide were generated by Geant4 simulation. To broad representativeness of simulated spectra, different measuring conditions were taken into consideration and more than 500 basic spectra were prepared to form a data library. Randomly choosing basic spectra from the library were summed with random-weight to generate millions of training spectra. The proposed model was trained using 4 million generated spectra - and tested by 3 kinds of spectra, namely spectra from generation-based spectra library, Geant4 simulation of mixed nuclides and measurements of actual mixed alpha source. The identified percentage contents by model prediction were compared with the original weight values to validate qualitative and quantitative identification of nuclides contained in spectra. Absolute errors of identified nuclide percentage contents were less than 1% for simulated spectra and less than 2% for acutal measured spectra. The accuracy could be improved further by increasing the number of nuclides contained in library, the range of measuring conditions in simulation and the data set of generated training spectra used in model training. Results indicated that deep learning mode could identify the nuclide contained in complicated alpha spectra and determine the content of nuclide with good accuracy. The method proposed in this study has great potential in quantitative spectral alpha isotope identification.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"186 ","pages":"Article 107460"},"PeriodicalIF":1.6,"publicationDate":"2025-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144155065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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