Radiation Physics and Chemistry最新文献

{"title":"NORM monitoring of oil and gas operations","authors":"Anne L. Awan ,&nbsp;David A. Bradley","doi":"10.1016/j.radphyschem.2025.112743","DOIUrl":"10.1016/j.radphyschem.2025.112743","url":null,"abstract":"<div><div>Naturally Occurring Radioactive Materials (NORM) can be found in upstream oil and gas facilities, including risers, tubulars, valves, separators, other top-side facilities, and storage vessels. Data from Malaysia are offered herein, arising from a comprehensive study of several years duration carried out during the 1990s, obtained across multiple exploration and production operators in off- and onshore oil and gas environments. The survey allowed the establishment of an early set of reference levels for the observation of NORM presence in the oil and gas industry, with measurements made under routine conditions as well as during specific activities (maintenance and workovers in particular). The quantity and quality of NORM level data have provided a baseline that has since aided in identification of affected facilities, waste streams, and appropriate management. Assessments have been carried out using a combination of field equipment and laboratory-based facilities. Of relatively low occurrence, nevertheless indicative of potentially large volumes, NORM at more pronounced levels are observed, examples including external and internal (specific monitoring internal inspections of facilities) exposure rates of up to 21.2 μSv/h and 145.0 μSv/h respectively. These can be compared against a mean external exposure rate of some 0.13 μSv/h offshore, 0.10–0.25 μSv/h onshore and a national regulatory limit of 0.5 μSv/h (derived from 1 mSv/year, assuming 2000 working hours/year). In one extreme case, sludge and sand from vessel cleaning activities recorded NORM total activity concentration of 209.9 Bq/g, compared against a national total activity regulatory limit of 3 Bq/g at the time of the survey. In routine operations, the initial survey showed alpha and beta emitter surface contamination and elevations of radon gas and airborne particulates of low occurrence, NORM being confined strongly within facilities. Conversely, specific monitoring levels exceeding regulatory limits have since been more readily observed. Regular monitoring has continued to present time, the datum line levels providing data critical in enhancing safety measures, validating compliance with regulatory limits, and supporting sustainable operations in offshore oil and gas environments. Industry procedures aimed at the management of NORM-contaminated facilities and waste are helping to mitigate risks from radiation exposure and environmental impact.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"233 ","pages":"Article 112743"},"PeriodicalIF":2.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715527","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":"Enhanced radiation shielding properties of bismuth tellurite glasses: A study on mass attenuation, equivalent atomic number and build-up factors","authors":"Anil Kharb,&nbsp;Renu Sharma","doi":"10.1016/j.radphyschem.2025.112737","DOIUrl":"10.1016/j.radphyschem.2025.112737","url":null,"abstract":"<div><div>This research examines the gamma-ray shielding properties of bismuth tellurite glasses with the composition (85-x)TeO₂–15B₂O₃-xBi₂O₃, where x ranges from 0 to 65 mol% for photon energies between 0.015 MeV and 15 MeV. The study found that the addition of Bi₂O₃ significantly improved the density &amp; shielding efficiency of prepared glass samples, which increased from 5.37 g/cm³ to 7.26 g/cm³. The mass attenuation coefficient (MAC) declines with increasing photon energy but peaks at 90.52 keV due to bismuth's K-edge absorption highlighting strong photon interaction. The effective atomic number (Z_eff) and equivalent atomic number (Z_eq) are highest at lower photon energies, emphasizing the dominance of the photoelectric effect<strong>.</strong> Electron density (Ne) follows a similar trend, reinforcing the improved shielding performance of high Bi₂O₃ glasses.</div><div>The exposure build-up factors (EBF) and energy absorption build-up factors (EABF) were calculated using the WinXCom software and the Geometric Progression (G-P) fitting method. The result indicated that these bismuth tellurite glasses particularly the G₅ glass sample demonstrate superior shielding performance compared to traditional lead glasses, especially for high-energy radiation. This suggests that these glasses could serve as effective, environmentally safer alternatives for radiation protection.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"234 ","pages":"Article 112737"},"PeriodicalIF":2.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143768911","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":"Pulmonary CT angiography procedure: Radiation dose assessment and establishment of local diagnostic reference level in a single hospital in Morocco","authors":"A. El Khatib ,&nbsp;M. Mkimel ,&nbsp;M. Tahiri ,&nbsp;R. El Baydaoui ,&nbsp;A. Halimi","doi":"10.1016/j.radphyschem.2025.112740","DOIUrl":"10.1016/j.radphyschem.2025.112740","url":null,"abstract":"<div><div>Computed tomography pulmonary angiography (CTPA) plays a crucial role in diagnosing pulmonary embolism; however, it raises significant concerns regarding patient radiation exposure. This study aimed to assess radiation dose levels and establish local diagnostic reference levels (LDRLs) for CTPA in Morocco. A total of 555 patients undergoing CTPA examinations in a single hospital were included. Data collected included demographic information, exposure parameters, and dosimetric indicators such as dose-length product (DLP) and volume computed tomography dose index (CTDI_vol). The LDRLs were determined based on the 75th percentile (3rd quartile) values of these dosimetric indicators. The LDRLs were established at 439.3 mGy.cm for DLP and 41.07 mGy for CTDI_vol. Compared to international studies, our DLP values were higher than those reported in the Netherlands, Ireland, Malaysia, and Greece but lower than those from Saudi Arabia, Switzerland, and the United Kingdom. In contrast, our CTDI_vol values were significantly higher than all previously reported studies. These findings highlight the need to address elevated radiation doses in CTPA examinations. This study underscores the importance of dose assessment and optimization to reduce radiation exposure while maintaining diagnostic image quality. Implementing dose reduction strategies is essential to improve patient safety and align local practices with international standards.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"233 ","pages":"Article 112740"},"PeriodicalIF":2.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678204","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":"Microstructural, thermal analysis, and gamma-ray shielding properties of bricks made of various local natural materials","authors":"Yahaya Khalid Kaika, Ibrahim Umaru, Muhammad Mustapha Idris, U. Rilwan, Jibrin Ahmed Guto, M.I. Sayyed, A.U. Maisalatee, Abdullahi Abubakar Mundi, K.A Mahmoud","doi":"10.1016/j.radphyschem.2025.112742","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112742","url":null,"abstract":"In this study, we prepared five brick samples based on clay (C), granite (G), laterite (L), basalt (B) and assessed their radiation shielding performances. The densities of the bricks were calculated by dividing the mass of each sample by their volumes. The X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray techniques (EDX), differential thermal analysis (DTA), and thermogravimetric analysis (TGA) were respectively used to identify the crystal structure, morphological structure, chemical composition, and thermal behaviour of the prepared bricks. The radiation shielding properties of prepared brick samples were examined to check the ability of the prepared materials in attenuating the gamma-ray photons. At 0.033–2.506 MeV, basalt and granite bricks have the highest linear attenuation coefficient, of 22.332-0.097 cm<ce:sup loc=\"post\">−1</ce:sup> (for basalt bricks) and 35.633–0.096 cm<ce:sup loc=\"post\">−1</ce:sup> (for granite bricks) among the prepared bricks. The study shows that basalt and granite brick samples have suitable shielding properties.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"72 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143744686","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":"Measurement of Kβ/Kα X-ray intensity ratios in nickel, cobalt, copper and zinc doped WO3 thin films","authors":"Betül Demirezen ,&nbsp;Ömer Söğüt ,&nbsp;Süleyman Kerli ,&nbsp;Ali Gürol","doi":"10.1016/j.radphyschem.2025.112738","DOIUrl":"10.1016/j.radphyschem.2025.112738","url":null,"abstract":"<div><div>In this study, the Kβ/Kα X-ray intensity ratios of tungsten oxide (WO₃) thin films doped with 10–20 % Ni, Co, Cu and Zn transition metals by spray pyrolysis method were investigated by X-ray fluorescence technique (XRF). A²⁴¹Am radioactive source emitting a beam with an intensity of 5 Ci (∼185 GBq) and an energy of 59.543 keV was used to excite the samples. A HPGe detector with a resolution of 180 eV at 5.96 keV was used to count the characteristic X-rays emitted from the thin films. The impact of doping transition metals on the crystal structure of WO₃ thin films was investigated using XRD analysis, while their morphological properties were examined via scanning electron microscopy (SEM) coupled with energy-dispersive X-ray spectroscopy (EDX). It was observed that the Kβ/Kα X-ray intensity ratios increased in accordance with the concentrations of transition metals doped into the WO₃ thin film samples. The values obtained from the Kβ/Kα X-ray intensity ratios were compared with the findings of theoretical and experimental studies for pure Ni, Co, Cu and Zn elements. XRD analysis revealed that undoped tungsten oxide and nickel, cobalt and copper doped thin films have an amorphous structure, while zinc doped tungsten oxide thin film has a monoclinic structure.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"233 ","pages":"Article 112738"},"PeriodicalIF":2.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143705046","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":"Progress towards electron–photon coincidence detection of noble gases for enhanced safety monitoring of nuclear fuel","authors":"S.E. Poulton ,&nbsp;P.H. Regan ,&nbsp;S.J. Bell ,&nbsp;R. Shearman ,&nbsp;M.A. Goodwin ,&nbsp;E.B. O’Sullivan ,&nbsp;M. Ryan","doi":"10.1016/j.radphyschem.2025.112703","DOIUrl":"10.1016/j.radphyschem.2025.112703","url":null,"abstract":"<div><div>The conditions under which nuclear fission occurs affects the ratio of radio-xenon isotopes and their metastable states which are produced. Measuring the ratio can be used to monitor the condition of nuclear fuel through its life span. This conference paper presents preliminary results from the testing of an electron–photon coincidence system at resolving signals from two isotopes of radio-xenon compared to the background. The detector system is comprised of a PIPSBox silicon detector and a high-purity germanium detector, with signals from both detectors processed using a 500 MHz CAEN digitiser. The system was tested using a mixed gaseous source containing <span><math><msup><mrow></mrow><mrow><mn>131</mn><mi>m</mi></mrow></msup></math></span>Xe (t<span><math><msub><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span>=11.84(4) days) and ¹³³Xe (t<span><math><msub><mrow></mrow><mrow><mn>1</mn><mo>/</mo><mn>2</mn></mrow></msub></math></span>=5.25475(5) days). The preliminary results show a clear separation between events associated with the discrete-energy internal conversion lines associated with the <span><math><msup><mrow></mrow><mrow><mn>131</mn><mi>m</mi></mrow></msup></math></span>Xe decay and the coincident characteristic Xe K<span><math><msub><mrow></mrow><mrow><mi>α</mi></mrow></msub></math></span> and K<span><math><msub><mrow></mrow><mrow><mi>β</mi></mrow></msub></math></span> X-rays and those events associated with the beta decay from the ground state of ¹³³Xe to excited states in the ¹³³Cs daughter nucleus.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"233 ","pages":"Article 112703"},"PeriodicalIF":2.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696047","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":"Comprehensive organ-specific radiation dose mapping in coronary angiography using the Alderson Rando phantom: An experimental approach to optimize patient safety","authors":"Duygu Tunçman Kayaokay ,&nbsp;Fahrettin Fatih Kesmezacar ,&nbsp;Nami Yeyin ,&nbsp;Songül Çavdar Karaçam ,&nbsp;Osman Günay ,&nbsp;Turgut Karabağ ,&nbsp;Mustafa Demir ,&nbsp;Bashar Issa ,&nbsp;H.O. Tekin ,&nbsp;Ghada ALMisned","doi":"10.1016/j.radphyschem.2025.112739","DOIUrl":"10.1016/j.radphyschem.2025.112739","url":null,"abstract":"<div><div>This study aimed to evaluate radiation dose distribution to critical organs, specifically the lungs, heart, and breasts, during coronary angiography using the Alderson Rando phantom. Thermoluminescent dosimeters (TLDs) were positioned at different anatomical sites within the Alderson Rando ® phantom to measure radiation exposure in a controlled simulation replicating clinical coronary angiography conditions. Our findings indicated significant variability in lung doses, with the highest exposure observed in middle lung regions due to direct alignment with the primary X-ray beam path. Cardiac dose measurements showed a relatively uniform distribution, with elevated exposure in the basal and atrial regions, reflecting their proximity to the central beam. In the breast tissue, a pronounced dose asymmetry was noted, with the right breast, particularly lateral and posterior regions, receiving substantially higher radiation due to its closer positioning to the X-ray source and increased scatter. According to results, there are different levels of radiation exposure across organs and anatomical regions during coronary angiography. It can be concluded that implementing targeted dose-reduction strategies, such as shielding and optimized angulation, is essential to protect sensitive organs, with personalized imaging protocols recommended to enhance patient safety and minimize cumulative radiation risks.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"233 ","pages":"Article 112739"},"PeriodicalIF":2.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143675588","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":"Novel fabricated germanium-doped optical fibres as high absorbed dose measurement detector for mapping gamma-ray Cesium-137","authors":"K.S.A.K. Bakar ,&nbsp;N.M. Noor ,&nbsp;F. Idris","doi":"10.1016/j.radphyschem.2025.112736","DOIUrl":"10.1016/j.radphyschem.2025.112736","url":null,"abstract":"<div><div>Measurement of radiation absorbed dose is crucial for assessing potential biological harm to living tissues, ensuring safety and precision in dose delivery to human tissue. TA-GVH disease is a prevalent complication of blood transfusion. The dose mapping method ensures that the radiation dose to the blood remains within the predetermined limits set by authorities up to 50 Gy. This study aims to explore the possibilities of using fabricated germanium-doped (Ge-doped) optical fibre dosimeters as a radiation dose mapper for quality assurance (QA).</div><div>Two types of fabricated 2.3mol % Ge-doped optical fibres were used, cylindrical (CF) and flat (FF), calibrated within a high dose range of 5–50 Gy using a Cobalt-60 machine at the SSDL, Nuclear Malaysia Agency. Dose mapping was conducted in a Cesium-137 source blood irradiator at the Pathology Department, HSAAS, using blood-equivalent phantom to gamma radiation of 25 Gy and comparing thermoluminescence (TL) signals with EBT-XD film.</div><div>The result showed no significant difference in mean absorbed dose between both optical fibres and External Beam Therapy (EBT) film. Both fibres exhibited a mean error of 4 %, and EBT-XD film was 3.4 %, indicating good agreement with the nominal dose value of 25 Gy.</div><div>High radiation exposure can be accurately monitored and assessed using a dosimetry method, such as Ge-doped optical fibre dosimetry. This passive dosimeter offers high sensitivity, cost-effectiveness, and reusability, making it a valuable alternative to conventional blood dosimetry. Comprehensive dose mapping allows for precise monitoring and evaluation of the radiation field, ensuring accurate assessment of radiation exposure in high-dose radiation environments.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"233 ","pages":"Article 112736"},"PeriodicalIF":2.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143678191","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":"Evaluation of multi-leaf collimator accuracy in Halcyon system using logfile analysis","authors":"Nguyen Khac Son, Luong Tien Phat, Ha Anh Tu, Ngo Hoang Long, Duong Thanh Tai, Paul Booker, Sitti Yani, Abdelmoneim Sulieman, Nissren Tamam, Peter Sandwall, James C.L. Chow","doi":"10.1016/j.radphyschem.2025.112741","DOIUrl":"https://doi.org/10.1016/j.radphyschem.2025.112741","url":null,"abstract":"This study evaluates multi-leaf collimator (MLC) positioning accuracy in the Halcyon linear accelerator using logfile analysis across head and neck, thoracic, and pelvic regions. Logfiles from 1282 fractions (366 head and neck, 524 thoracic, 392 pelvic) were analyzed for real-time versus planned MLC positions and monitor unit (MU) discrepancies, assessing root mean square (RMS) errors and deviations within ±0.35 cm per AAPM TG-142 and TG-198 guidelines. RMS errors were low across all regions, with head and neck showing the highest variations due to modulation complexity, thoracic the widest deviations from respiratory motion, and pelvic the most stable. Over 95 % of MLC deviations were within 0.35 cm, and delivered MUs were slightly higher than planned but within QA limits. The findings demonstrate that the Halcyon system consistently meets stringent QA standards for MLC positioning accuracy and dose delivery across different anatomical regions. Logfile analysis provides a reliable, non-invasive, and automated QA method for real-time assessment of MLC performance, enhancing the overall quality and safety of radiotherapy treatments.","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"42 1","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143744687","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":"Wet gas flow measurement using transmitted gamma-ray profile around a vertical C-line, including a spiral blade preconditioner","authors":"Mehdi Izadi ,&nbsp;Ataollah Rabiee ,&nbsp;Mohsen Sharifzadeh","doi":"10.1016/j.radphyschem.2025.112718","DOIUrl":"10.1016/j.radphyschem.2025.112718","url":null,"abstract":"<div><div>The measurement of wet gas is still an important issue that needs to be investigated. In misty regime conditions, measuring the phase fraction is often inaccurate due to a small amount of liquid spreading over a large area of the tube. This problem is usually addressed by applying correction coefficients, but this can lead to high uncertainties in the final measurement. Providing preconditioning systems that can convert misty flow into a suitable regime to overcome this obstacle is considered a good idea.</div><div>In this study, a mixer with spiral blades was designed to eliminate the regime-dependency problem. Its performance was confirmed by converting misty wet gas through the 32״ C-line to quasi-annular flow in the Analysis System (ANSYS) simulator. Next, samples with a density equivalent to the liquid phase and thickness equal to them were created and attached to the inner wall of the C-line tube in the laboratory based on the Computational Fluid Dynamics (CFD) simulation. Finally, the transmitted gamma-ray in different angles around the pipe was measured using a sodium-iodide counter and compared in two situations: placing the radioactive source in the center of the tube or outside it opposite to the scintillation detector. The results demonstrate the proposed system's capability to differentiate between liquid fractions of 1 %, 3 %, and 5 % with a maximum absolute error of ±2 %. This represents a significant improvement compared to conventional methods that rely on gamma transmission without a preconditioning system. Additionally, placing the radioactive source in the tube center was determined to be the optimal option for more accurate measurements.</div></div>","PeriodicalId":20861,"journal":{"name":"Radiation Physics and Chemistry","volume":"234 ","pages":"Article 112718"},"PeriodicalIF":2.8,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800523","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}