Radiation Physics and Chemistry最新文献

{"title":"Assessment of radiation doses due to the 238U and 232Th series received by women and girls during the application of different skin care creams","authors":"Rodouan Touti ,&nbsp;Hicham Harrass ,&nbsp;Abdullah K. Alanazi ,&nbsp;Abdellah Tahiri","doi":"10.1016/j.radphyschem.2025.113322","DOIUrl":"10.1016/j.radphyschem.2025.113322","url":null,"abstract":"<div><div>Women use creams to firm their bodies and combat skin ageing. In order to study the exposure of <span><math><mrow><mmultiscripts><mrow><mi>U</mi><mspace></mspace></mrow><mprescripts></mprescripts><none></none><mn>238</mn></mmultiscripts></mrow></math></span><em>,</em> <span><math><mrow><mmultiscripts><mrow><mi>T</mi><mi>h</mi><mspace></mspace></mrow><mprescripts></mprescripts><none></none><mn>232</mn></mmultiscripts></mrow></math></span> and their progeny to human skin using skin care creams we quantified the levels of these radionuclides using CR-39 and LR-115 type II solid state nuclear trace detectors. The annual equivalent doses to the skin from these radionuclides resulting from the application of skin care creams by young girls and women were assessed. The maximum total annual equivalent dose to the skin from the <span><math><mrow><mmultiscripts><mrow><mi>U</mi><mspace></mspace></mrow><mprescripts></mprescripts><none></none><mn>238</mn></mmultiscripts></mrow></math></span> and <span><math><mrow><mmultiscripts><mrow><mi>T</mi><mi>h</mi><mspace></mspace></mrow><mprescripts></mprescripts><none></none><mn>232</mn></mmultiscripts></mrow></math></span> series resulting from the application of these creams was found to be equal to <span><math><mrow><mn>0.14</mn><mspace></mspace><mi>μ</mi><mi>S</mi><mi>v</mi><mspace></mspace><mo>.</mo><msup><mi>y</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup><mo>.</mo><msup><mrow><mi>c</mi><mi>m</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></mrow></math></span>. The impact of pollution on the radiation dose received by women employed in the manufacture of building materials and phosphate fertilisers was examined. The results showed that the maximum total annual equivalent dose due to α-emitting radionuclides of the ²³⁸U and ²³²Th chains was <span><math><mn>7</mn><mi>μ</mi><mi>S</mi><mi>v</mi><mspace></mspace><msup><mi>y</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup><msup><mrow><mi>c</mi><mi>m</mi></mrow><mrow><mo>−</mo><mn>2</mn></mrow></msup></math></span>.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113322"},"PeriodicalIF":2.8,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157904","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":"MaksChroms: An open-source CNN-based tool for dose prediction based on dicentric chromosome assay","authors":"Maksymilian Głowacki ,&nbsp;Martin Bucher ,&nbsp;David Endesfelder ,&nbsp;Maria Szoła ,&nbsp;Adrianna Tartas ,&nbsp;Yohei Fujishima ,&nbsp;Ursula Oestreicher ,&nbsp;Maria Kowalska ,&nbsp;Paweł Kotowski ,&nbsp;Jan Borkowski ,&nbsp;Beata Pszczółkowska-Kępa ,&nbsp;Józef Ginter ,&nbsp;Andrzej Wojcik ,&nbsp;Beata Brzozowska","doi":"10.1016/j.radphyschem.2025.113329","DOIUrl":"10.1016/j.radphyschem.2025.113329","url":null,"abstract":"<div><div>One of the most widely used biological dosimetry methods for estimating ionizing radiation dose is the dicentric chromosome assay. Accurate dose estimates are essential for effective medical response in radiological and nuclear emergencies and have applications in molecular epidemiology. Manual scoring of chromosomal aberrations is time-consuming and subject to scorer variability. We introduce MaksChroms, a novel software for automated analysis of dicentric chromosomes in microscopic images, using an approach that separately detects chromosome candidates and centromeres. Image sets of metaphases from the MULTIBIODOSE project (14 269 in total), including 5444 expert-labeled images, were used for training and testing. Samples were from blood exposed to gamma radiation (0.25–5 Gy) and unexposed controls. Two models were developed: model A, based on R–CNN and EfficientNet, performs instance segmentation and classification of chromosomes; model B, based on U-Net, performs semantic segmentation to locate centromeres. Outputs are combined in a final model. The root mean square error of dose reconstruction for this model was 0.42 Gy. Differences in scoring were also observed between human experts. MaksChroms supports manual correction of detected chromosomes and classifications, and enables dose calculation using built-in or user-defined calibration curves, providing an efficient automated or semi-automated tool for dicentric chromosome assay.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113329"},"PeriodicalIF":2.8,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145181279","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":"Accuracy of machine learning algorithms for HPGe detector efficiency determination","authors":"B. González-González ,&nbsp;U. Abascal-Ruiz ,&nbsp;M. Villa-Alfageme ,&nbsp;S. Hurtado-Bermúdez","doi":"10.1016/j.radphyschem.2025.113328","DOIUrl":"10.1016/j.radphyschem.2025.113328","url":null,"abstract":"<div><div>The accurate determination of full-energy peak efficiency (FEPE) in High-Purity Germanium (HPGe) detectors is critical for gamma-ray spectrometry, especially when source-detector geometries vary. In this study, we investigate the application of six supervised machine learning (ML) algorithms—Polynomial Regression, Random Forest, XGBoost, LightGBM, Sparse Gaussian Process, and Multi-Layer Perceptron—for predicting FEPE of a Low Energy HPGe (LEGe) detector across a broad energy range (40–1600 keV) and diverse source types (point and volumetric). Datasets used for training, validation and testing the ML models were generated using Monte Carlo simulations (GESPECOR). Model performance was evaluated using cross-validation and standard error metrics (R², RMSE, MRE). Among the tested models, Polynomial Regression and LightGBM demonstrated superior predictive accuracy and interpretability, achieving R² values above 0.9999. SHAP values were used for explainability, demonstrating that the models successfully capture the key physical mechanisms influencing FEPE. These results position ML models as reliable and generalizable alternative to conventional FEPE calibration methods.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113328"},"PeriodicalIF":2.8,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145157881","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":"The correlation between optical, mechanical, and radiation shielding properties for SiO2–ZnO–PbO2 glass samples doped with different concentrations of Gd2O3","authors":"M.H.A. Mhareb ,&nbsp;M.I. Sayyed ,&nbsp;Awatif Alshamari ,&nbsp;M. Kh Hamad","doi":"10.1016/j.radphyschem.2025.113325","DOIUrl":"10.1016/j.radphyschem.2025.113325","url":null,"abstract":"<div><div>Four silicate glasses modified with ZnO and PbO₂ and doped with different ratios of Gd₂O₃ were manufactured to evaluate their optical, mechanical, and radiation shielding characteristics. The evaluation used the Makishima–Mackenzie principle to assess the mechanical features, the absorption spectra to compute the band gap and optical features, and the Phy-X program for the estimation of the radiation shielding parameters. There was a 56.035 to 54.913 GPa modulus reduction with increased Gd₂O₃ and PbO₂. Also, the band gap showed a reduction from 2.920 to 2.789 eV. The mechanical and optical properties results showed decreased glass stability with the addition of Gd₂O₃ and PbO₂. On the other side, the radiation shielding behavior increased. For example, at 0.015 the mass attenuation coefficient increased from 74.974 to 78.600 cm²/g. According to the above results, it can be deduced that the present samples showed acceptable glass stability and radiation shielding parameters, nominating the glass for use as radiation shielding materials.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113325"},"PeriodicalIF":2.8,"publicationDate":"2025-09-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145219818","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":"Assessing the efficacy of sustainable and composite materials as shielding solutions for cosmic radiation protection in space missions","authors":"Mehdi Hassanpour ,&nbsp;Marzieh Hassanpour ,&nbsp;Mohammadreza Rezaie ,&nbsp;Mohammad Rashed Iqbal Faruque ,&nbsp;Mayeen Uddin Khandaker ,&nbsp;D.A. Bradley ,&nbsp;Mustafa Mahmoud","doi":"10.1016/j.radphyschem.2025.113317","DOIUrl":"10.1016/j.radphyschem.2025.113317","url":null,"abstract":"<div><div>The protection of spacecraft, such as the International Space Station (ISS), from space radiation is essential to ensure the safety of both the crew and equipment. This study evaluates the shielding performance of two composite materials, jute/polyester and glass/polyester, against cosmic radiation, with a focus on their ability to mitigate high-energy particles. By investigating cosmic sources such as protons, neutrons, and gamma rays, the study analyzes the materials' effectiveness in reducing radiation exposure and their resistance to particle-induced spallation. Key findings highlight that both materials provide substantial shielding, with jute/polyester offering the added benefit of sustainability. The study also examines the formation of secondary particles and long-lived radionuclides generated during cosmic particle interactions. These results indicate that jute/polyester and glass/polyester composites can serve as effective, lightweight, and potentially eco-friendly shielding solutions for future space missions, including applications in the ISS.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113317"},"PeriodicalIF":2.8,"publicationDate":"2025-09-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145266402","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":"Ku-band electron linac for battery-powered hand-portable 2-MeV X-ray generator","authors":"S.V. Kutsaev,&nbsp;R. Agustsson,&nbsp;R. Berry,&nbsp;E. Ivanov,&nbsp;K. Kaneta ,&nbsp;M. Kravchenko,&nbsp;A. Pronikov ,&nbsp;M. Ruelas,&nbsp;A. Yu Smirnov,&nbsp;S. Uvalle","doi":"10.1016/j.radphyschem.2025.113318","DOIUrl":"10.1016/j.radphyschem.2025.113318","url":null,"abstract":"<div><div>X-ray generators, producing radiation in MeV range, are a critical tool for radiography, non-destructive testing and security applications. Field operation of such source requires them to be hand-portable, autonomous and allow parameter adjustability. RF linear accelerators can serve as a flexible, reliable, and robust radiation generator alternative to dangerous radioisotopes and bulky betatrons that are currently used for field radiography if their size, weight, cost, and imaging performance are matched to these sources. In this paper, we present the design and test results of a 2 MeV Ku-band electron linac for a hand-portable X-ray generator system for field radiography being developed by RadiaBeam. The dramatic scale of miniaturization and cost-reduction is achieved thanks to the implementation of innovative technologies such as air-cooled Ku-band air-traffic control magnetrons, a split accelerating structure fabrication technique, and solid-state Marx modulators. This paper presents the design of the first prototype of the accelerator, its operation from Li-Ion batteries, as well as high-power and beam measurements.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113318"},"PeriodicalIF":2.8,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093879","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":"High-intensity electron beam irradiation coupled with wet disk milling for enhanced enzymatic hydrolysis of lignocellulosic biomass","authors":"Akio Kumagai ,&nbsp;Keita Sakakibara ,&nbsp;Kentaro Harada ,&nbsp;Hiroshi Sakai ,&nbsp;Takashi Endo","doi":"10.1016/j.radphyschem.2025.113315","DOIUrl":"10.1016/j.radphyschem.2025.113315","url":null,"abstract":"<div><div>The aim of this study was to evaluate the effectiveness of combining high-intensity electron beam irradiation (EBI) with wet disk milling (WDM) as a chemical-free pretreatment in enhancing the bioconversion efficiency of lignocellulosic biomass. This combined approach rapidly reduced cellulose recalcitrance without generating chemical waste, making it environmentally friendly and potentially scalable for industrial applications. Three types of lignocellulosic biomass, namely Japanese cedar, Eucalyptus, and Moso bamboo, were pretreated with high-intensity EBI, WDM, or a combination of both methods. Pretreatment effects were evaluated by analyzing the enzymatic hydrolysis efficiency of cellulose to glucose, crystallinity index (CrI), chemical composition of the biomass, specific surface area (SSA), and morphological observations using a scanning electron microscope. The effect of high-intensity EBI on CrI and chemical composition varied by species. Eucalyptus, a hardwood species, demonstrated a substantial improvement in enzymatic hydrolysis efficiency with high-intensity EBI pretreatment alone, suggesting a high susceptibility to this treatment. SSA measurements and morphological observations demonstrated that high-intensity EBI pretreatment enhanced the fibrillation efficiency of subsequent WDM pretreatment across all species. Although individual high-intensity EBI or WDM pretreatments yielded a limited glucose conversion, pretreatment with high-intensity EBI followed by WDM improved the glucose conversion rates by 43.2 %, 90.0 %, and 43.6 % for Japanese cedar, Eucalyptus, and Moso bamboo, respectively, compared with the untreated control. These results demonstrate the synergistic effect of the combined pretreatment (high-intensity EBI and WDM), markedly enhancing the enzymatic hydrolysis efficiency across diverse lignocellulosic feedstocks. The combined pretreatment is a potentially effective, environmentally friendly strategy for large-scale biorefineries.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113315"},"PeriodicalIF":2.8,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093877","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":"Enhancing backscatter X-ray imaging with CNN-based denoising: Superior performance in noise reduction and processing efficiency","authors":"Mohammad Mehdi Sarvi ,&nbsp;Mojtaba Tajik ,&nbsp;Esmaeil Bayat","doi":"10.1016/j.radphyschem.2025.113316","DOIUrl":"10.1016/j.radphyschem.2025.113316","url":null,"abstract":"<div><div>This study proposes a CNN approach for denoising backscatter X-ray images, which are typically raucous due to low photon energy and subject movement. In contrast to the non-local means filtering and K-SVD, which are highly computationally intensive and require elaborate parameter tuning, the proposed CNN approach maximizes denoising quality while minimizing computation time. The tests were carried out using PSNR and SSIM metrics, and the proposed method shows a clear margin above the traditional methods in performance throughout, at processing times of under 2 s. The influence of batch normalization is assessed in this study; results reveal that smaller batch sizes enhance learning efficiency and decrease overall network error. It shows therefore the ability of CNNs to improve images in real-time while maintaining high fidelity for security and inspection applications, thus providing a scalable and efficient solution for real-time deployment in critical environments.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113316"},"PeriodicalIF":2.8,"publicationDate":"2025-09-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145093864","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":"Pulse height analysis and pulse shape discrimination of pure LaCl3 scintillation crystal across a broad neutron energy range","authors":"Siriyaporn Sangaroon ,&nbsp;Hong Joo Kim ,&nbsp;Nguyen Duy Quang ,&nbsp;Kunihiro Ogawa ,&nbsp;Mitsutaka Isobe ,&nbsp;Jakrapong Kaewkhao ,&nbsp;Nuanthip Wantana ,&nbsp;Apiwat Wisitsorasak ,&nbsp;Sho Toyama ,&nbsp;Misako Miwa ,&nbsp;Shigeo Matsuyama ,&nbsp;Nuttawadee Intachai ,&nbsp;Suchart Kothan","doi":"10.1016/j.radphyschem.2025.113290","DOIUrl":"10.1016/j.radphyschem.2025.113290","url":null,"abstract":"<div><div>A pure LaCl<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> crystal scintillation detector has been developed and shows strong potential for fast neutron detection, particularly via the ³⁵Cl(n,p)³⁵S and ³⁵Cl(n,<span><math><mi>α</mi></math></span>)³²P reactions. These reaction channels make it a promising candidate for neutron spectroscopy applications in nuclear fusion research. In this study, a comprehensive characterization of the pure LaCl<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> scintillation detector was performed in a mixed neutron and <span><math><mi>γ</mi></math></span>-ray radiation field. Pulse height analysis and neutron–<span><math><mi>γ</mi></math></span> pulse shape discrimination were systematically evaluated over a wide neutron energy range, from approximately 2.46 MeV to 16.89 MeV, using both a ²⁵²Cf spontaneous fission source and a mono-energetic neutron beam at the Fast Neutron Laboratory, Tohoku University. The results reveal a clear separation between neutron- and <span><math><mi>γ</mi></math></span>-induced signals, with figure-of-merit values exceeding 1.18 at specific energies, demonstrating the detector’s excellent pulse shape discrimination performance. The pulse height response associated with charge generation in the pure LaCl<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> scintillation crystal was systematically characterized. Energy calibration and linearity for neutron energies up to 5.61 MeV were verified through the peak corresponding to the ³⁵Cl(n,p)³⁵S ground-state reaction. These findings confirm that pure LaCl<span><math><msub><mrow></mrow><mrow><mn>3</mn></mrow></msub></math></span> scintillators exhibit excellent neutron–<span><math><mi>γ</mi></math></span> discrimination, enabled by differences in the pulse height and decay time characteristics of the induced signals, making them well-suited for high-resolution neutron spectroscopy in mixed radiation fields typical of magnetic confinement fusion environments.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113290"},"PeriodicalIF":2.8,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145109283","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":"Influence of gamma irradiation on electrical and elastic properties of lithium aluminum borate glasses doped with Terbium trioxide","authors":"Nagaraju J,&nbsp;Eraiah B","doi":"10.1016/j.radphyschem.2025.113283","DOIUrl":"10.1016/j.radphyschem.2025.113283","url":null,"abstract":"<div><div>Lithium aluminum borate glasses doped with terbium oxide were fabricated via the melt quench technique. The density and molar volume of the resultant glasses were determined by employing the proper technique. Investigations were conducted into how gamma radiation affected the electrical conductivity and elastic properties of synthesized glasses. XRD profiles verify the non-crystalline nature of the produced materials. In order to comprehend the dielectric characteristics of the glass matrix in the frequency range set between 50 Hz and 1 MHz, the electric modulus, relaxation mechanism, and conductivity parameters were examined, which show promise for applications in semiconducting devices. The Makishima and Mackenzie approach was employed to predict the theoretical elastic parameters. The rise in elastic moduli values with the addition of Tb³⁺ ions, as well as Gamma ray irradiation, indicates an enhancement in the material strength. The findings are articulated through a notable structural change induced by molecular rearrangement, which governs the physical characteristics of the glass.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"239 ","pages":"Article 113283"},"PeriodicalIF":2.8,"publicationDate":"2025-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145060607","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}