Radiation Measurements最新文献

{"title":"Photon energy estimation in diagnostic radiology using OSL dosimeters: Experimental validation and Monte Carlo simulations","authors":"Bui Ngoc Huy,&nbsp;Pham Van Dung,&nbsp;Huynh Thi Tinh,&nbsp;Nguyen Thi Ha,&nbsp;Nguyen Minh Duc","doi":"10.1016/j.radmeas.2024.107342","DOIUrl":"10.1016/j.radmeas.2024.107342","url":null,"abstract":"<div><div>The EGSnrc Monte Carlo software toolkit was used to evaluate the energy response and estimate the photon energy based on the E3/E4 ratio for the InLight XA Optical Luminescence Dosimeters (OSLDs).</div><div>The InLight XA OSLDs were irradiated with Cs-137 source and ISO 4037-1 narrow-spectrum series X-ray qualities (N40, N60, N80, and N100). The virtual OSLDs on the surface of the PMMA phantom were constructed in EGSnrc, energy response and ratio E3/E4 of the dosimeters was determined and compared to the physical measurements.</div><div>Good agreement was found between the simulated and measurement approaches in estimating the photon energy with a percentage difference of less than 6%. The E3/E4 ratio from simulation, physical measurements, and microStar system showed very good agreement results with the maximum difference of 9.3% and 10.94%, respectively. Furthermore, the OSLDs energy response varied significantly at energy below 100 keV due to the photoelectric effect.</div><div>The results of this study identify and address the over-response of OSLDs to low-energy photons, offering correction factors to minimize errors, especially in diagnostic radiology applications. These findings have the potential to improve dose accuracy for patients and radiation workers by providing more precise photon energy estimations, particularly at lower energy ranges, such as in diagnostic X-rays. The function used to evaluate photon energy using E3/E4 ratio has a great influence on the accuracy of such algorithms. It also ensures that imaging equipment is properly calibrated for the specific energy ranges needed, enhancing diagnostic accuracy. Furthermore, precise dose measurements are essential for maintaining regulatory compliance and long-term patient exposure records, ultimately promoting safer and more effective radiological practices.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107342"},"PeriodicalIF":1.6,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700872","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":"Exploration of dosimetry characteristics of PVA/MWCNT-OH nanocomposite for intraoperative electron radiotherapy","authors":"Shahryar Malekie ,&nbsp;Seyed Rashid Hosseini Aghdam ,&nbsp;Seyed Mahmoud Reza Aghamiri ,&nbsp;Armin Mosayebi ,&nbsp;Suffian Mohamad Tajudin","doi":"10.1016/j.radmeas.2024.107345","DOIUrl":"10.1016/j.radmeas.2024.107345","url":null,"abstract":"<div><div>This study investigates the dosimetric properties of a Polyvinyl Alcohol/Multi-Walled Carbon Nanotube Hydroxyl (PVA/MWCNT-OH) composite intended for intraoperative electron radiotherapy (IOeRT). A dosimeter was fabricated using a 0.02 wt% MWCNT-OH nanocomposite, featuring a thickness of 2 mm and a diameter of 2 cm. The electric charge recorded during irradiation served as the response for this real-time dosimeter. The dosimetry type-testing criteria for IOeRT at 8 MeV were evaluated, encompassing aspects such as linearity of response, dose rate, bias polarity, repeatability, field size, and dependency on electron energy. To assess energy dependency, the dosimeter's response was measured at various energies including 6, 8, 10, and 12 MeV utilizing a LIAC dedicated IOeRT machine. The results indicated a linear correlation in the dosimeter's response across absorbed doses up to 17 Gy. Furthermore, the various type-testing evaluations demonstrated compliance with IEC 60731 standard, with the exception of energy dependency, which necessitates the application of a suitable correction factor.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107345"},"PeriodicalIF":1.6,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700906","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":"Review of real time 2D dosimetry in external radiotherapy: Advancements and techniques","authors":"Luana de Freitas Nascimento ,&nbsp;Alessia Gasparini","doi":"10.1016/j.radmeas.2024.107344","DOIUrl":"10.1016/j.radmeas.2024.107344","url":null,"abstract":"<div><div>The objective of this paper is to provide a comprehensive review of the advancements and techniques in real time two-dimensional (2D) dosimetry for external radiation therapy with emphasis in vivo dosimetry and patient specific quality assurance. External radiation therapy plays a crucial role in cancer treatment, delivering high-energy radiation beams to target tumours while minimizing damage to surrounding healthy tissues. Accurate dosimetry, as both the measurement of the dose and its delivered location, is paramount to ensure effective treatment outcomes and minimize potential side effects.</div><div>The planned content of this paper encompasses a thorough examination of the advancements made in 2D dosimetry techniques, including solid state and electronic systems. The evolution from traditional passive dosimetry to modern real time detectors, such as portal imaging, has revolutionized the field, offering enhanced precision, efficiency, and convenience. This review will discuss the principles, advantages, and limitations of these systems, along with their practical implementation and calibration procedures.</div><div>Furthermore, the paper will highlight novel technologies, such as luminescence coatings, for quality assurance (QA) and real-time dose verification during treatment. The use of innovative materials and designs in dosemeters, including high spatial resolution detectors and tissue-equivalent phantoms, will also be explored. Additionally, the incorporation of advanced data analysis techniques, such as machine/deep learning algorithms, for dose reconstruction and QA will be addressed.</div><div>The review will also explore the application of real time 2D dosimetry in modern clinical and pre-clinical modalities, including intensity-modulated radiation therapy and volumetric modulated arc therapy, stereotactic radiosurgery, image-guided radiation therapy, particle therapy, adaptive radiotherapy, electron and proton ultra-high dose rate therapy and very high energy electrons.</div><div>By providing an up-to-date overview of the state-of-the-art in real time 2D dosimetry in <em>vivo dosimetry</em> and patient specific quality assurance, this paper aims to inform and guide professionals in the field, facilitating the adoption of cutting-edge techniques and improving the accuracy and safety of external radiotherapy treatments.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107344"},"PeriodicalIF":1.6,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700868","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":"Clinical evaluation of a new device for acceptance testing of Ru-106 plaques in ophthalmic brachytherapy","authors":"María Martorell Ruiz ,&nbsp;Roberto M. Sánchez Casanueva ,&nbsp;Antonio Gañán Mora ,&nbsp;José M. Fernández-Soto","doi":"10.1016/j.radmeas.2024.107343","DOIUrl":"10.1016/j.radmeas.2024.107343","url":null,"abstract":"<div><h3>Purpose</h3><div>Ophthalmic brachytherapy treats eye lesions by stitching plaques containing a radionuclide (e.g. Ru-106) onto the sclera. Compliance with quality assurance standards is crucial, but practical limitations complicate independent source strength measurement in clinical practice. In this article, a new prototype for acceptance testing of Ru-106 plaques is assayed to assess its suitability for a hospital's medical physics department.</div></div><div><h3>Methods and materials</h3><div>The system designed for Ru-106 plaque assessment includes a phantom basin fillable with water, a Si-diode for electrons coupled with an electrometer, type-dependent plaque holders and a micrometre gauge. Testing involved the measurement of three plaque types (CCA, CIB, COB) by six medical physics experts and trainees, the assessment of inter and intra-observer variability and the suitability for measurement at the reference point, 2 mm.</div></div><div><h3>Results</h3><div>Measured absorbed dose rates in water at 2 mm from the plaque surface demonstrated compatibility across all testers for the three plaques. Intra and inter-observer variability was minimal (1.0% and 1.3% of the measured value, respectively), confirming system robustness in terms of operator influence.</div></div><div><h3>Conclusions</h3><div>The system proves suitable for Ru-106 plaque acceptance testing ensuring accurate plaque positioning and dose rate verification at 2 mm. These findings confirm its potential as a support for compliance with quality assurance standards. These results are subject to the issue of the corresponding calibration certificate for the Si-diode.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107343"},"PeriodicalIF":1.6,"publicationDate":"2024-11-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700869","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":"About thermal stability of the F+ centers in MgO single crystals irradiated by fast neutrons or energetic Ar ions","authors":"Guldar Baubekova ,&nbsp;Ruslan Assylbayev ,&nbsp;Alise Podelinska ,&nbsp;Viktor Seeman ,&nbsp;Evgeni Shablonin ,&nbsp;Evgeni Vasil'chenko ,&nbsp;Aleksandr Lushchik","doi":"10.1016/j.radmeas.2024.107335","DOIUrl":"10.1016/j.radmeas.2024.107335","url":null,"abstract":"<div><div>Single crystals of MgO have been exposed to 70-MeV argon ions with varying fluence of 4 × 10¹²-3 × 10¹⁴ cm⁻². The dependence of radiation-induced optical absorption (RIOA) at 1.7–6.5 eV on irradiation fluence has been analyzed. The EPR signal of the <em>F</em>⁺ center in ion-irradiated crystal has been detected and via the EPR parameters proved to be the same as in well-studied neutron-irradiated MgO crystals. The precise isothermal annealing of the <em>F</em> ⁺ EPR signal has been performed for the first time in a temperature range of 400–1100 K for both a fast neutron irradiated (2.7 × 10¹⁸ cm⁻²) and Ar-irradiated (3 × 10¹⁴ cm⁻²) MgO crystals. In both cases, the <em>F</em> ⁺ EPR decay starts only above 700 K and ends at 950–1060 K, depending on irradiation type. Using the same stepwise annealing procedure, the changes in RIOA for ion-irradiated samples have also been analyzed and possible reasons for the discrepancy in the thermal behaviour of optical and EPR <em>F</em> ⁺ -absorption have been considered.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107335"},"PeriodicalIF":1.6,"publicationDate":"2024-11-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700908","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":"Study on dosimetric characteristics of polycarbonate films irradiated by electron beam","authors":"Ke Wang ,&nbsp;Zhizeng Pan ,&nbsp;Longxiang Yin ,&nbsp;Haifeng Zhang ,&nbsp;Yuchen Zou ,&nbsp;Xionghui Fei","doi":"10.1016/j.radmeas.2024.107333","DOIUrl":"10.1016/j.radmeas.2024.107333","url":null,"abstract":"<div><div>In this study, the dosimetric characteristics (thickness applicability, dose linear response, signal fading characteristic, in-batch consistency, readout reproducibility, humidity dependence, and electron energy response) of engineering polycarbonate films irradiated by electron beam were studied using spectrophotometry. The results show that polycarbonate films of various thicknesses exhibit good dose linearity within their corresponding wavelength ranges. Specifically, the dose capture range of 0.3 mm polycarbonate film spans from 950 Gy to 1000 kGy. After irradiation, the net absorbance of polycarbonate films showed an exponential decline, which was dose-dependent. The average absolute deviation of net absorbance for polycarbonate films produced within the same batch is 1.49% at 100 kGy. After 15 repeated absorbance measurements, the coefficient of variation in net absorbance for the polycarbonate films is less than 1%. Additionally, the radiation response of the polycarbonate film is affected by the environment relative humidity (during irradiation and post-irradiation storage). At the same dose of 3.5–20 MeV electron beam irradiation, the net absorbance response deviation of polycarbonate films remains below 2.26%. These results provide a comprehensive reference for detecting high doses of electron beams using engineering polycarbonate films.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107333"},"PeriodicalIF":1.6,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658307","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":"Modeling detector response curves for a high-fidelity uranium measurement for use in simulations","authors":"Lohith Annadevula ,&nbsp;S.K. Aghara ,&nbsp;Chris Gazze ,&nbsp;Kenneth Jarman ,&nbsp;Claude Norman","doi":"10.1016/j.radmeas.2024.107332","DOIUrl":"10.1016/j.radmeas.2024.107332","url":null,"abstract":"<div><div>Enrichment measurements using identiFinder2 (‘HM5’) detector are performed on two Material Testing Reactor (MTR) fuel assemblies - one with low-enriched uranium plates (LEU) and another with high-enriched uranium plates (HEU). The effectiveness of International Atomic Energy Agency (IAEA) inspection plans for verifying nuclear material strata, in the form of defect detection probability (DP), is evaluated using statistical models. These models use defect identification probability (IP) curves, which represent the probability that a measured item is identified as a defective item. This paper describes a new modeling procedure that converts the experimental measurements into IP curves and employing such experimentally derived IP curves within DP simulations will better represent the experimental conditions like material type, material distribution, and plate configuration. A comparison of experimental performance curves to a simple statistical model (Gaussian, 15% relative standard deviation RSD) shows that the DP results from the modeled response of HM5 measurements better captures the experimental conditions. This result highlights a need for further research into experimental error variables test model development as use of a simple model does not adequately capture true performance in either the LEU or HEU cases.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107332"},"PeriodicalIF":1.6,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700870","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":"Monte Carlo calculation of LiF:Mg,Cu,P thermoluminescent dosimeter correction factors for 18F, 131I and 90Y submersion dosimetry","authors":"Ahad Ollah Ezzati ,&nbsp;Farzane Mohajeri ,&nbsp;Matthew Studenski","doi":"10.1016/j.radmeas.2024.107331","DOIUrl":"10.1016/j.radmeas.2024.107331","url":null,"abstract":"<div><div>Accurate measurement of absorbed dose from beta-emitting therapeutic radionuclides is important to ensure safe and effective delivery to patients. Thermoluminescent dosimeters (TLDs) are a commercially available option to measure dose, but several confounding factors complicate this process. To preserve their integrity during the measurement, it is necessary to enclose TLDs in a waterproof envelope, which unavoidably attenuates the beta particles. Additionally, the exclusion of radioactivity in the volume occupied by the TLD, the finite volume effect, further complicates the measurement. The purpose of this study is to calculate the correction factors to convert the TLD measured dose to the absorbed dose in water, D_w, for three common radionuclides and the LiF:Mg,Cu,P TLD (Thermo Fisher Scientific™, Waltham, MA). Correction factors were calculated for four different size LiF:Mg,Cu,P TLD dosimeters inside a PMMA cylindrical phantom with ⁹⁰YCl₃, C₆H₁₁¹⁸FO₅, and Na¹³¹I aqueous solutions. Specific correction factors are required to account for finite volume, energy, and geometry for each LiF:Mg,Cu,P TLD size, radionuclide, and phantom geometry combination. Additionally, for the PMMA phantom, specific material correction factors are also required to account for the additional materials inside the phantom. The absorbed dose calculations performed with LiF:Mg,Cu,P TLDs showed good agreement with Monte Carlo simulations. Overall, these findings contribute to improving the accuracy of absorbed dose measurements from beta-emitting radionuclides in liquid solutions using TLDs.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107331"},"PeriodicalIF":1.6,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142658306","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":"Monte Carlo dosimetry for a EURADOS WG 10 and RENEB field test of retrospective dosimetry techniques in realistic exposure scenarios","authors":"Hyoungtaek Kim ,&nbsp;Min Chae Kim ,&nbsp;Olivier Van Hoey ,&nbsp;Jonathan Simon Eakins ,&nbsp;Hyungjoon Yu ,&nbsp;Hanjin Lee ,&nbsp;Michael Discher ,&nbsp;Jungil Lee ,&nbsp;Lovisa Waldner ,&nbsp;Clemens Woda ,&nbsp;Francois Trompier ,&nbsp;Céline Bassinet ,&nbsp;Sergey Sholom ,&nbsp;S.W.S. McKeever ,&nbsp;Elizabeth A. Ainsbury","doi":"10.1016/j.radmeas.2024.107329","DOIUrl":"10.1016/j.radmeas.2024.107329","url":null,"abstract":"<div><div>Computational dosimetry using Monte Carlo radiation transport simulations was applied for the 2019 European Radiation Dosimetry Group (EURADOS) and Running the European Network of Biological and retrospective Physical dosimetry (RENEB) field test, an exercise of retrospective dosimetry techniques for a realistic small-scale radiological accident. The simulations were performed at four institutes, using different codes and computerized anthropomorphic phantoms. Four exposure scenarios using Ir-192 were modeled: relatively homogeneous in a predominantly AP direction, heterogeneous in a predominantly anterior-posterior (AP) and left-lateral (LLAT) direction, and partially shielded. The items for dosimetry, such as mobile phones, blood tubes, and surface dosimeters, were designed and located based on the experimental pictures. Absorbed doses of dosimeters, such as thermoluminescence dosimeter (TLD), optically stimulated luminescence dosimeters (OSLD), radio-photoluminescence dosimeters (RPLD), and display glasses, inside and outside the phantoms were calculated and compared to the measured doses. In addition, photon energy spectra were calculated at different locations to correct the energy responses of the materials. The simulation results from the four institutes showed agreement with each other, showing an average relative difference of less than 14%. The Pearson's R-values for the linear fitting of the measured and calculated data ranged from 0.95965 to 0.68714, depending on the exposure scenario and institutes. Finally, the accuracy and limitations of the calculation techniques for the given exposure structures are discussed.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107329"},"PeriodicalIF":1.6,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700909","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":"Characteristics of neutron fields around biological shielding of research nuclear reactors in Russia","authors":"M.D. Pyshkina,&nbsp;A.V. Vasilyev,&nbsp;E.I. Nazarov,&nbsp;A.A. Ekidin","doi":"10.1016/j.radmeas.2024.107325","DOIUrl":"10.1016/j.radmeas.2024.107325","url":null,"abstract":"<div><div>The paper presents the results of a study of the neutron field characteristics surrounding biological shielding of Russian research nuclear reactors to establish their expected behavior and enhance personnel neutron monitoring. The study covered five nuclear research reactors: IVV-2M, IRT-T, IRT-MEPhI, RBT-6, and SM-3. All reactors are pool-typed; some (RBT-6 and SM-3) have pressurized water, while others (IVV-2M, IRT-T, and IRT-MEPhI) have water under normal pressure. The neutron fields analyzed are located at the tank cover of reactors, in front of the reactor core covered with biological shielding, and in front of the horizontal experimental channel. The spectrum average neutron energy ranges from 0.01 MeV (RBT-6) to 1.0 MeV (SM-3). The fluence-to-ambient dose conversion coefficient varies from 15 pSv <span><math><mrow><mo>∙</mo></mrow></math></span> cm² (RBT-6) to 260 pSv <span><math><mrow><mo>∙</mo></mrow></math></span> cm² (SM-3). The spectra at the other measurement points exhibit the energy distribution characteristics of the neutron radiation flux density behind the biological shielding.</div></div>","PeriodicalId":21055,"journal":{"name":"Radiation Measurements","volume":"180 ","pages":"Article 107325"},"PeriodicalIF":1.6,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142700907","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}