Radiation Measurements最新文献

{"title":"Experimental evaluation of combined ageing and fading effects on annual radon concentration measurement based on nuclear track detectors","authors":"Caprio M,&nbsp;Ampollini M,&nbsp;Antignani S,&nbsp;Carpentieri C,&nbsp;Di Carlo C,&nbsp;Maiorana A,&nbsp;Bochicchio F","doi":"10.1016/j.radmeas.2025.107378","DOIUrl":"10.1016/j.radmeas.2025.107378","url":null,"abstract":"<div><div>The effect of ageing and fading on solid-state nuclear track detectors (SSNTD), used for measuring radon concentrations, leads to a decrease in the number of counted tracks and thus to an underestimation of actual radon exposure. The ISO 11665–4:2020 standards for radon concentration measurements using passive devices make no mention of “Ageing and Fading” effects among the “influence quantities” that can bias measurement results. The present experimental study aimed to investigate the presence of the ageing and fading effects in typical indoor environments for SSNTD, particularly for three different radon measurement techniques (detector and track-readout systems). The first two techniques use Poly(allyl diglycol carbonate) (PADC) detectors, also known commercially as CR-39, manufactured by Intercast Spa and Radosys Ltd respectively, while the third technique uses a cellulose nitrate detector similar to LR-115 (manufactured by Dosirad-Kodak). For simplicity, throughout this paper, these detectors will be referred to as CR-39 and LR-115, respectively. For the two different techniques based on CR-39, track counting is done by a fully automated image analysis system, whereas with the LR-115, the tracks are counted using a spark counter. The present study, following previous work, aimed to evaluate the effects of ageing and fading on the three techniques over exposure periods of 3, 6, and 12 months. The findings suggest that ageing and fading do not significantly impact the response of technique based on LR-115 and CR-39 detectors. However, for the technique based on CR-39 detectors produced by Radosys, a considerable underestimation of the actual radon exposure was observed. Specifically, the results show that the measurement of annual integrated radon exposure, decrease by approximately 10%, when performed using two consecutive 6-month monitoring periods (2 detectors, one per semester) compared to four consecutive 3-month monitoring periods (4 detectors, one per quarter). Similarly, a decrease of approximately 20% was observed in the annual integrated radon exposure when performed using a single 12-month monitoring period (one detector in a year) compared to four consecutive 3-month monitoring periods (4 detectors, one per quarter). These findings highlight the importance of carefully considering the detector material and technique used for radon measurement, particularly for extended measurement periods, and then considering the effects of ageing and fading when developing future standards for radon concentration measurements.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107378"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149297","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}

{"title":"Energy diagnostics of the TOP-IMPLART linac proton beam via radiophotoluminescence of color centers in lithium fluoride","authors":"Enrico Nichelatti ,&nbsp;Alessandro Ampollini ,&nbsp;Maria Denise Astorino ,&nbsp;Giulia Bazzano ,&nbsp;Rosa Maria Montereali ,&nbsp;Paolo Nenzi ,&nbsp;Valentina Nigro ,&nbsp;Concetta Ronsivalle ,&nbsp;Vincenzo Surrenti ,&nbsp;Emiliano Trinca ,&nbsp;Maria Aurora Vincenti ,&nbsp;Massimo Piccinini","doi":"10.1016/j.radmeas.2024.107369","DOIUrl":"10.1016/j.radmeas.2024.107369","url":null,"abstract":"<div><div>Lithium fluoride crystals have been routinely employed as passive radiation detectors based on radiophotoluminescence to assess the energy characteristics of the TOP-IMPLART linac proton beam during commissioning. This is achieved by leveraging their capability to record full Bragg curves through the stable formation of visible-light-emitting color centers in the LiF crystal lattice due to interactions with incoming protons. Here, a brief overview of the current state of this simple and powerful energy diagnostics method is presented, focusing on the latest improvements made to the theoretical model used for analysis. In particular, a new method to correct the analysis for systematic errors introduced by angular misalignment between the proton beam and the LiF crystal is presented.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107369"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Feasibility study on dose conversion using a deep learning algorithm for retrospective dosimetry","authors":"Hyoungtaek Kim,&nbsp;Byoungil Jeon,&nbsp;Min Chae Kim,&nbsp;Yoomi Choi","doi":"10.1016/j.radmeas.2025.107382","DOIUrl":"10.1016/j.radmeas.2025.107382","url":null,"abstract":"<div><div>The application of deep learning-based artificial intelligence (AI) models for dose estimation has garnered significant attention in dosimetric research, aiming to supplement or replace Monte Carlo (MC) particle transport simulations. The present study explores the feasibility of AI-based dose conversion techniques for retrospective dosimetry in radiological emergencies, particularly focusing on scenarios where a rapid estimation of body dose is required using measured doses from fortuitous dosimeters placed on or near the body during exposure. With the modeling of an International Commission on Radiation Units and Measurements (ICRU) slab phantom (presuming a human body) and glass plates (presuming fortuitous dosimeters), a large amount of dose data was generated through MC simulations with respect to randomly generated point sources (¹⁹²Ir, ¹³⁷Cs, and ⁶⁰Co) within a radius of 3 m from the phantom center. A deep learning (DL) model was trained to estimate doses and dose conversion coefficients (DCCs) between the phantom and the glass plates using the input of exposure structures, i.e. the position and energy of the source. Data scaling, such as logarithmic or power transformations, was essential for the dose data due to its highly biased distribution. The results showed that 98% of the estimated doses had relative differences (RDs) within ±3% when compared to MC simulations. To assess the impact of data volume on performance, datasets of varying sizes (55 k, 108 k, 216 k, and 432 k) were used for training, revealing a strong dependence of model performance on data volume. Outlier reduction methods, such as dose averaging and data reduction near the center, were applied, reducing the max-min RD range by a factor of 3–10. From the results, the potential and necessity of an AI dose estimation model for more complicated geometries, such as those involving anthropomorphic phantoms, were discussed.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107382"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An alpha imaging detector for on-site measurement of plutonium and neptunium","authors":"Yuki Morishita ,&nbsp;David P. DiPrete ,&nbsp;Travis Deason ,&nbsp;Ryuji Nagaishi","doi":"10.1016/j.radmeas.2024.107366","DOIUrl":"10.1016/j.radmeas.2024.107366","url":null,"abstract":"<div><div>Nuclear fuel materials such as Plutonium (Pu) and Neptunium (Np) are produced as by-products of reprocessing operations, necessitating precise understanding of their contamination distribution within controlled areas for radiation protection. This study presents the development and application of an alpha particle imaging detector for on-site detection of Pu and Np contamination. The detector's performance was evaluated using various alpha sources, demonstrating promising energy resolution and spatial resolution. Subsequently, ²³⁹Pu and ²³⁷Np oxide samples were measured at the Savannah River National Laboratory, showing the detector's effectiveness in on-site applications. The detector enabled simultaneous measurement of radioactivity and energy spectrum of individual particles, facilitating rapid discrimination between ²³⁹Pu and ²³⁷Np. The imaging detector has potential for enhancing on-site detection of alpha nuclides in nuclear facilities, aiding in decontamination efforts and environmental monitoring.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107366"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149298","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}

{"title":"Lexsyg luminescence measurement devices: Status and outlook","authors":"Richter D ,&nbsp;Richter A ,&nbsp;Kumar T ,&nbsp;Pintaske R ,&nbsp;Dornich K","doi":"10.1016/j.radmeas.2025.107377","DOIUrl":"10.1016/j.radmeas.2025.107377","url":null,"abstract":"<div><div>The 2012 introduction of a new concept for an automated luminescence reader where detectors and detection windows can be automatically changed – the <em>lexsygresearch</em> - increased the versatility of luminescence measurements, especially in solid-state dosimetry. This was followed in 2014 by a miniaturized version, <em>lexsygsmart</em>, for more routine luminescence measurement, being equipped only with a single measurement position for a single detector plus an irradiation source. This review provides an update on the current technical specifications for both devices to measure fluorescence and phosphorescence during and after stimulation as radioluminescence, thermoluminescence, and photoluminescence. Key features of the <em>lexsygresearch</em> are the absence of light cross-talk to other sample aliquots and minimized radiation cross-talk while providing true non-stop operation with no breaks required for sample changes. The modular design facilitates the implementation of measurement/detection modules on a four-position detector changer and the five sample treatment positions, thus making upgrades easy. Up to three ionizing radiation sources, some with highly homogeneous fields, including an X-ray generator can be used. Luminescence stimulation can be performed either by irradiation sources, thermally or optically with up to three different wavelengths, while detection windows can be limited by combining two automatic six-position filter wheels. The <em>lexsygresearch</em> can be used as a spectrometer or equipped with Peltier cooling of the sample in addition to the standard heating up to 710 °C. Spatially resolved luminescence, as well as the individual laser stimulation of single mineral grains, is possible, while time-resolved/pulsing luminescence measurements not only provide means for fundamental research but also allow IRPL measurement of feldspar. For the analysis of SAR OSL data, the software LexEva provides a user interface to the R ‘Luminescence’ package, and thus, the results of dose determinations rely on a community-driven open-source project.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107377"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143150799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Active radon detection unit","authors":"Mehmet Erhan Emirhan","doi":"10.1016/j.radmeas.2025.107373","DOIUrl":"10.1016/j.radmeas.2025.107373","url":null,"abstract":"<div><div>Radon (²²²Rn) is a naturally occurring radioactive gas that poses health risks when accumulated indoors. In this study, we present the design and implementation of an Active Radon Detection Unit (ARDU) for indoor radon measurements. The ARDU utilizes Si-PIN photodiodes for the electrostatic collection of radon progeny, enabling the real-time monitoring of radon levels. It also integrates some sensors for measuring ambient temperature, humidity, pressure, carbon monoxide, and methane, providing a comprehensive indoor air quality assessment.</div><div>The ARDU consists of six main components: the amplifier board, the collection chamber, the high voltage module, the microprocessor integrated control board, the global system for mobile communication module, and the liquid crystal display touch screen. The amplifier board amplifies and digitizes the signals generated from the alpha particles depositing their energy in Si-PIN photodiodes. The control board processes the data from the environmental sensors and amplifier board and transfers these to an integrated microprocessor. A mobile communication module facilitates remote data transmission via a short message service.</div><div>Experimental results demonstrate the effectiveness of the ARDU in measuring radon levels in indoor environments. Comparative analysis with commercially available radon detectors shows a good agreement within the daily average. Two different methods were performed for converting the raw counts per hour to Bq/m³. A radon emanation standard source and a calibrated gold standard device were used as a reference. Secondly, statistical analysis confirms the significance of the regression model used for converting raw detector signals to Bq/m³ units.</div><div>Overall, the ARDU provides a cost-effective solution for continuous indoor radon monitoenvironmental factors. The device's portability and affordability make it suitable for widespread deployment, contributing to comprehensive radon monitoring efforts.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107373"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149322","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}

{"title":"Real time monitoring of Rn-222 in workplaces and estimation of working time correction factor","authors":"I. Dimitrova,&nbsp;V. Todorov,&nbsp;S. Georgiev,&nbsp;K. Mitev","doi":"10.1016/j.radmeas.2024.107359","DOIUrl":"10.1016/j.radmeas.2024.107359","url":null,"abstract":"<div><div>The potential of electronic monitors for evaluating radon exposure is still not fully harnessed, and tests under real conditions are scarce. Ten workplaces were continuously monitored for a year with the radon measurement network of Sofia University, with calibrated and metrologically assured RadonEye +2 monitors. In 7 of the workplaces the average activity concentration of radon during the working time was significantly lower than the total time average. This difference is attributed to behavioral patterns. The ratio of the working time and the total time average (called working time correction factor <em>k</em>_WT) for the whole year ranged from 0.71 to 0.98. Its weekly values varied significantly with coefficients of variation between 9 and 28%. Therefore, using short term estimates of <em>k</em>_WT to correct the total time radon average determined by passive detectors could lead to bias.</div><div>The workplaces also exhibited different seasonal radon patterns, although most were offices with similar schedules. In most pairs of workplaces the monthly averages were correlated very weakly or even negatively. This indicates that seasonal radon variations could be specific to each workplace. The value of <em>k</em>_WT also varied with the season, suggesting that seasonal variations of radon during working hours might differ from those observed with passive integrating detectors.</div><div>Overall, long-term follow-up by metrologically assured electronic monitors could help to improve and personalize the estimate of radon exposure of workers. These monitors could potentially support smart anti-radon systems with optimal operation schedules, thereby contributing to the reduction of the energy impact of buildings.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107359"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coloration-dependent correction for heavy ion measurements in an Al2O3:C,Mg-based fluorescent nuclear track detector","authors":"Jun Hu,&nbsp;Tamon Kusumoto,&nbsp;Satoshi Kodaira","doi":"10.1016/j.radmeas.2025.107384","DOIUrl":"10.1016/j.radmeas.2025.107384","url":null,"abstract":"<div><div>To reduce or eliminate fluctuations in fluorescence intensity due to optical absorption and spherical aberration of a focused laser beam, and variations in color center concentrations between individual Al₂O₃:C,Mg-based fluorescent nuclear track detectors (FNTDs), we adopted the intensities of F₂²⁺ (2 Mg) and F₂⁺ (2 Mg) color centers corresponding to green and near-infrared (NIR) colorations, respectively. These intensities were used to develop coloration-dependent correction methods to improve accuracy of the FNTD-based heavy ion measurements. The FNTDs were irradiated with He, C, Ne, and Fe ions to prepare mono-energetic and multi-energetic specimens and then the performance of the correction methods was evaluated. Both the green and NIR coloration-dependent correction methods eliminated fluctuations in fluorescence intensity with depth, reducing the coefficient of variation (<em>CV</em>) by 36.6% and 35.9%, respectively. The green coloration-dependent correction method also reduced fluctuations of fluorescence intensity due to color centers by decreasing <em>CV</em>_<em>w</em> by 45.3%. The NIR coloration-dependent correction method was ineffective for correcting fluctuations due to color centers compared to the green coloration-dependent correction. The fluorescence intensities of He, C, and Fe tracks corrected by green and NIR colorations in the multi-energetic specimen coincided with those of mono-energetic specimens. Hence, these methods provide reliable and standardized approaches for heavy ion measurements and have the potential to be applied in determining the LET of heavy ions.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107384"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149300","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}

{"title":"Assessment of Cerenkov optical noise in a brachytherapy scintillating fibre dosimeter with an air-core Ag-PTFE light guide","authors":"Nor El Houda Boughaba ,&nbsp;Boualem Bouzid ,&nbsp;Nadia Yahlali","doi":"10.1016/j.radmeas.2024.107348","DOIUrl":"10.1016/j.radmeas.2024.107348","url":null,"abstract":"<div><div>Plastic scintillating fibre dosimeters have been the subject of multiple studies in the field of medical dosimetry, due to their notable dosimetric properties, including water equivalence, small size and absence of energy and dose rate dependence. The main drawback of this dosimeter type in high dose-rate brachytherapy is the presence of Cerenkov photons produced by electrons with velocities exceeding the speed of light in the fibre plastic medium. In this work, aimed at minimizing Cerenkov noise at its source in a prototype scintillation fibre dosimeter, the plastic light guide exposed to the radiation field was replaced by an air-core Ag-PTFE light guide of miniature size. Cerenkov-to-signal ratio was first assessed in fibre bundles using a dedicated experimental setup and simulations. This ratio was found of about <span><math><mrow><mo>∼</mo><mn>1</mn></mrow></math></span> <span><math><mtext>%</mtext></math></span> for scintillating fibres when exposed to radiation in the energy range 1–2 MeV. The performance of the air-core Ag-PTFE light guide dosimeter was then studied, resulting in a decrease of the Cerenkov light in the total signal from <span><math><mrow><mo>∼</mo><mn>50</mn></mrow></math></span> <span><math><mtext>%</mtext></math></span> to less than 0.3%, compared to the standard dosimeter with a plastic optical light guide. The counterpart of this substantial reduction of optical noise is a reduction of 40% in the dosimeter light collection efficiency. However, this is not a limiting feature of this Cerenkov-free dosimeter, since further optical optimizations are possible, in addition to the use of a high-gain and high-sensitivity photodetector for its readout.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107348"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149306","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}

{"title":"A correction method between sample mass and EPR intensity in radiation dose reconstruction","authors":"Shuchen Wang ,&nbsp;Zhenlin Jia ,&nbsp;Desheng Xue ,&nbsp;Baotian Pan","doi":"10.1016/j.radmeas.2024.107364","DOIUrl":"10.1016/j.radmeas.2024.107364","url":null,"abstract":"<div><div>In electron paramagnetic resonance (EPR) radiation dose reconstruction, maintaining a consistent mass across a series of aliquots is crucial. However, due to sample limitations or experimental uncertainties, achieving this consistency may not always be possible. To address these challenges and optimize experimental processes, a theoretical model (<span><math><mrow><mi>I</mi><mo>−</mo><mi>M</mi></mrow></math></span> model) was developed to describe the relationship between EPR intensity emanating from a TE₀₁₁ mode cylindrical resonant cavity and sample mass. The model was verified using the TEMPO paramagnetic standard and quartz, a common material employed in dosimetry reconstructions. Based on this model and the evaluation of the modulation magnetic field uniformity, correction methods for EPR intensity in solid powder samples were proposed. The model reveals that the non-uniformity of the microwave magnetic field distribution in the resonant cavity leads to spatial inconsistency in sample responses, resulting in a non-linear relationship between EPR intensity and sample mass, characterized by a “sinusoidal + linear” pattern. The parameter <span><math><msub><mrow><mi>I</mi></mrow><mrow><mi>cen.</mi></mrow></msub></math></span> is recommended as a metric for EPR intensity, as it intrinsically characterizes the spin concentration of the sample regardless of sample mass, thereby enhancing the accuracy of quantitative EPR measurements and equivalent dose evaluation.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"181 ","pages":"Article 107364"},"PeriodicalIF":1.6,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143149316","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}