最新刊期
      卷 42 ， 期 11 ， 2019

        SYNCHROTRON RADIATION TECHNOLOGY AND APPLICATIONS

      • “上海光源二期时间分辨超小角散射线站采用多层膜双晶单色器，覆盖8至15千电子伏特能量范围，为超高分辨率研究提供新方向。”
        SUN Xiaopei,ZHU Wanqian,XU Zhongmin,QIN Hongliang
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110101
        摘要：BackgroundA double multilayer monochromator (DMM) is required in the time-resolved ultra small angle X-ray scattering (USAXS) beamline during Shanghai Synchrotron Radiation Facility (SSRF) phase II construction.PurposeThis study aims at the structure design of DMM for the USAXS beamline of SSRF to satisfy the requirements.MethodsBased on condition of indirectly cooled by liquid nitrogen, thermal slope error of the multilayer was analyzed and detailed mechanical design of the DMM was introduced. Based on the analysis of the errors caused by the multilayer crystal optics attitude adjustment and the planar four-bar motion mechanism, a Sinbar mechanism based on Pivot and bearing rotating was designed for the DMM.Results & ConclusionBasical analysis and calculation results show the design scheme can meet the requirements of monochromator stability and ultra-high angle resolution. At present, the monochromator is manufacturing and its performance will be tested and reported in the future.  
        关键词：Synchrotron radiation;Monochromator;Multilayer;Liquid nitrogen cooling;Small angle X-ray scattering   
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        发布时间：2024-10-25
      • “在电动汽车领域，新型锂离子电池正极材料NCM的研究取得进展，专家通过研究不同元素配比，为优化材料电化学性能提供解决方案。”
        WU Yanru,ZHANG Nian,ZHANG Hui,LIU Na,XU Zhongling,LI Qifeng,CHEN Yujun,LIU Xiaosong
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110102
        摘要：BackgroundLi(NixCoyMn1-x-y)O2 (NCM), as a new cathode material of Li-ion battery, has been successfully used in the electric vehicles. It has the advantages of high energy density, good cycling stability and low cost. The crystal structure and electronic structure of Li(NixCoyMn1-x-y)O2 (NCM) cathode are mainly affected by the variable composition of 3d transition metals Ni, Co and Mn.PurposeThis study aims to investigate the influence of component proportion on the structure and electrochemical performance of Li(NixCoyMn1-x-y)O2 cathode materials.MethodsFirst of all, Li(Ni0.6Co0.2Mn0.2)O2 (NCM622), Li(Ni0.5Co0.2Mn0.3)O2 (NCM523) and Li(Ni0.33Co0.33Mn0.33)O2 (NCM333), were selected as three common cathode materials used in industry. Their structures and electrochemical performances were studied by electrochemical methods, scanning electron microscopy (SEM), X-ray powder diffraction (XRD) and X-ray absorption spectroscopy (XAS). Then the corresponding relationship between structure and electrochemistry was established to optimize electrochemical performance of Li-ion batterie, and apply NCM materials to cathode of Li-ion batteries.ResultsElectrochemical measurement results show that NCM materials with higher nickel content have higher capacity density but lower rate capability. In SEM and XRD characterizations, the NCM materials with the three different compositions show similar morphology and crystal structure. XAS at Ni L-edge results reveal that by increasing nickel content in the NCM materials, the oxidation of Ni increases to a higher +3 state. In the O K-edge XAS, the enhanced intensity of a lower energy peak suggests the increased hybridization of Ni3d-O2p.ConclusionsBased on the investigations of capacity and rate capability, NCM523 is found to be a well-balanced component. The evolution of Ni and O electron structure is a crucial factor in determining their electrochemical performance.  
        关键词：Li(NixCoyMn1-x-y)O2;Cathode material;Electronic structure;X-ray absorption spectroscopy   
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        发布时间：2024-10-25

        ACCELERATOR, RAY TECHNOLOGY AND APPLICATIONS

      • “在X射线数字成像领域，专家通过实验测量了钢的等效射线衰减系数，为薄壁钢件检测工艺参数优化提供依据。”
        SUN Chaoming,SHENG Youping,GE Jiqiang,SUN Kaihua
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110201
        摘要：BackgroundEquivalent attenuation coefficients are needed to optimize X-ray digital radiography detection parameters of steel foils. However, the coefficients are associated with poly-energetic X-ray beam and are hardly accessible.PurposeThis study aims to find a practical way to measure the equivalent attenuation coefficients of steel by experimental analysis.MethodsFirstly, the principle of determining the equivalent attenuation coefficients was analyzed, and the parameters influencing the measurement result were found out. Then, variations of intensity of X-rays which transmitted a 0.05 mm steel foil fore-and-aft were measured by using digital detector arrays (DDAs), and the equivalent attenuation coefficients under different X-ray tube voltages from 30 kVp to 150 kVp were obtained.ResultsExperimental results show that the measured equivalent attenuation coefficients are greater than that of the monochromatic and collimated X-ray beam. The equivalent attenuation coefficients calculated by using the X-ray spectrum at different X-ray tube voltages and the ideal detector sensitivity function tend to agree with the measurement results. Significantly, the equivalent attenuation coefficients analyzed by image quality parameters agree well with the measurement results.ConclusionsIn X-ray digital radiography, the equivalent attenuation coefficient is very different from that of single energy narrow beam X-ray, so it is necessary to measure the equivalent attenuation coefficients that are directly related with image quality index.  
        关键词：Attenuation coefficient;X-ray;Digital detector arrays;Image quality   
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        发布时间：2024-10-25
      • “在医科达Synergy直线加速器均匀性检测领域，专家应用6 Sigma技术，建立多元回归模型，实现束流均匀性主动预防与修正。”
        LI Xianya,LIANG Wenjie,YANG Haiming,GUAN Yongjing,SUN Shaohan,FU Qingguo
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110202
        摘要：BackgroundSix sigma capability and control technology has been used to analyze the data of synergistic linear accelerator and evaluate the stability and controlled state. Uniformity of accelerator irradiation field is an important performance parameter of intensity-modulated radiation therapy (IMRT) with linear accelerator.PurposeThis study aims to employ six sigma capability and control technology in IMRT to keep the beam uniformity stable for a long time.MethodsX-ray uniformity data were collected and recorded for 9 consecutive months, once a week. A data record includes four types of parameters: X-direction flatness, X-direction symmetry, Y-direction flatness and Y-direction symmetry. First of all, the correlation between symmetry and flatness in the X, Y direction in the irradiation field of X-ray beam were analyzed. At the same time, a reasonable multiple regression model was established to search an optimal solution of beam uniformity. Then, the uniformity of accelerator would be adjusted to the optimal solution. Finally, the Individual and Moving Range Charts (I-MR) were applied to monitor the uniformity, and to provide timely warnings when unstable conditions exist.ResultsThrough the above improvements, the uniformity performance is better and stable. The results reflect the instability of beam uniformity.ConclusionThis technology can change the quality control of the accelerator from the pattern of passive detection mode to the active prevention mode.  
        关键词：Linear accelerator;Six sigma capability and control technology;Quality control;Beam uniformity   
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        发布时间：2024-10-25
      • “北京高能同步辐射光源磁铁位置调整装置，精度达5微米，为地脉动影响下不共振提供解决方案。”
        LIU Bo,MEN Lingling,XIN Hongbing,DONG Lan,LI Bo,WANG Xiaolong,LUO Tao,LIANG Jing,WANG Tong,MA Na,HE Zhenqiang,KE Zhiyong,ZHANG Xiaohui,SHEN Jianxin
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110203
        摘要：BackgroundThe device design requirements come from high-energy synchrotron radiation sources.PurposeThe purpose of this study was to design a new type of magnet support adjustment device that can meet the locking stability accuracy of 5 μm and the adjustment accuracy of 2 μm.MethodsAccording to the actual working conditions, the modal was statically and modally analyzed in ABAQUS software. Use inventor to design support and adjustment devices that meet the accuracy requirements, including high-precision adjustment plates, high-precision ball and high-precision gaskets.ResultsThe results show that the deformation of the V-frame and the adjustment plate is far less than the design requirements in statics, which can meet the adjustment requirements after installation, and the first-order natural frequency of the new device can meet the requirements of no resonance under the influence of ground pulsation.ConclusionsThe design idea and analysis results of the device satisfy the requirements of height, precision and rigidity at the beginning of the design, and lay a solid foundation for the subsequent beam center calibration and measurement.  
        关键词：Magnet adjustment device;High precision;Statics;Modal analysis;Measurement   
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        发布时间：2024-10-25

        NUCLEAR CHEMISTRY, RADIOCHEMISTRY, RADIOPHARMACEUTICALS AND NUCLEAR MEDICINE

      • “在医用诊断X射线领域，专家利用MCNP软件模拟X射线能谱，分析阳极脚跟效应，为评估图像质量和辐射剂量提供数据基础。”
        KONG Yan,ZHUO Weihai,CHEN Bo,ZHAO Chao
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110301
        摘要：BackgroundIn medical diagnostic radiology, detailed knowledge of X-ray spectra is required for evaluating the image quality and patients’ or staff’s radiation dose.PurposeThis study aims to simulate medical diagnostic X-ray spectra by using Monte Carlo method.MethodsFirst of all, a simplified X-ray machine head geometry model was constructed in MCNP (A general Monte Carlo N-Particle transport code) software. Then, the X-ray spectra and surface source data files in the output window were calculated under tube voltage ranging from 50 kVP to 150 kVP, filter ranging from 0.5 mm (Al) to 5 mm (Al) and anode angles ranging from 6° to 14°.ResultsDatabase of medical diagnostic X-ray spectra and surface sources in the output window are obtained by various machine X-ray head parameters. The calculated spectra are comparable to those of other X-ray spectra software.ConclusionsX-ray source and its spectra can be correctly simulated by electronically hitting the target through Monte Carlo simulation, providing a basis for future applications.  
        关键词：Diagnostic X-ray;X-ray spectra;Monte Carlo simulation   
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        发布时间：2024-10-25
      • “在放射性铀体内分布研究领域，专家建立了仿真模型，为计算放射性铀肺部滞留量提供解决方案。”
        YUAN Weiye,WANG Yidi,XI Yue,SUN Liang,TU Yu
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110302
        摘要：BackgroundIn the production process of nuclear industry, excessive intake of aerosols uranium-containing compounds due to accidents or other circumstances occurs from time to time.PurposeThis study aims to investigate the deposition and transfer of internal contamination caused by inhalation of radioactive uranium aerosols.MethodsThe latest respiratory tract model based on the Simulink simulation tool in MATLAB software was established according to the 130th report published by the ICRP (International Commission on Radiological Protection). Distribution and retention of uranium aerosols in the lung were simulated by combining with the specific biological metabolism and physical characteristics of several uranium containing compounds, so as to evaluate and predict the health hazard of internal pollution to patients.ResultsSimulation results show that 55.37% of single inhalation of UF6 entered the gastrointestinal tract and 12.89% was absorbed by blood and discharged from the lungs within the next few days. After inhalation of ADU, UO3 and UF4, these compounds stay in the lungs for a long time, and it takes about 300~1 000 days to clear from the lungs. Insoluble compounds such as UO2 and U3O8 will remain in the lung for more than 20 years.ConclusionsThe distribution and retention of different uranium compounds in vivo are different, and the treatment method needs to be selected according to the actual situation.  
        关键词：Internal irradiation;MATLAB;Uranium;Biokinetics   
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        发布时间：2024-10-25
      • “在粘土矿物胶体处理系统中，铝皂石胶体对U(VI)吸附效果显著，为含铀废水处理提供新思路。”
        DU Zuoyong,ZHANG Xueling,MA Jian,TUO Xianguo,ZHAO Yuting,YU Shujuan
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110303
        摘要：BackgroundThe research of radionuclide adsorped by colloids can provide understanding data and vital technical reference for the mechanism of clay colloid nuclide migration in the safety assessment of high-level radioactive waste repository.PurposeThis study aims to provide basic data and technical basis for the study of nuclide migration mechanism in clay mineral colloid processing system.MethodsThe structure and adsorption mechanism of saponite colloid were investigated by means of infrared spectrum (FT-IR), X-ray fluorescence spectrum (XRF) and scanning electron microscope (SEM) of laser granulator Zeta potentiometer. The contacting time, pH, particles and humic acid concentration were studied by static adsorption experiments.ResultsExperimental results showed that different types of particles in the solution have a huge influence on the adsorption. Best adsorption efficiency was achieved when the adsorption equilibrium time was 20 min, pH=6, humic acid was 2 mg.ConclusionsThe saponite colloid has excellent adsorption properties and is expected to be an adsorbent material capable of effectively treating uranium-containing wastewater.  
        关键词：Saponite;Colloid;U(VI);Adsorption;Mechanism   
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        发布时间：2024-10-25

        NUCLEAR ELECTRONICS AND INSTRUMENTATION

      • “在微处理器辐射效应研究领域，专家设计了STM32微处理器总剂量效应实验，验证了片内FLASH存储器最先损伤，为抗辐射加固技术提供数据支持。”
        CHEN Faguo,GUO Rong,LI Guodong,LIANG Runcheng,HAN Yi,YANG Mingming
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110401
        摘要：BackgroundThe radiation effects of semiconductor devices include single event upset effect, total ionizing dose effect and dose rate effect. The total ionizing dose effect on electronic systems becomes a priority for the improvement of reliability of radiation-tolerance robots.PurposeThis study aims to measure the irradiation damage dose of STM32 microcontroller unit fabricated by 180 nm complementary metal oxide semiconductor(CMOS) technology with on-line and off-line experimental testing approaches.MethodsA test system which consisted of minimum circuits, dosimeter, communication circuit and host computer was developed. On-line and off-line irradiation experiments were performed on 89 samples using 60Co source with different dose rates. Among these samples, 14 samples were on-line irradiated under 63.3 Gy(Si)∙h-1 and 101.2 Gy(Si)∙h-1 dose rates whilst 75 samples were off-line irradiated under dose rates range of 227.2 Gy(Si)∙h-1 to 855.0 Gy(Si)∙h-1.ResultsThe irradiation damage dose are (235.4±16.4) Gy(Si) and (197.4±13.0) Gy(Si), respectively, corresponding to the on-line testing with 63.3 Gy(Si)∙h-1 and 101.2 Gy(Si)∙h-1 dose rates. The irradiation damage dose of off-line testing is between 391.5 Gy(Si) and 497.6 Gy(Si).ConclusionsOn chip flash memory is the first damaged hardware unit in STM32 microprocessor, and the tolerant dose limit of off-line test is significantly higher than that of on-line test.  
        关键词：Total ionizing dose effect;Irradiation damage dose;STM32;On-line testing;Off-line testing   
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        发布时间：2024-10-25

        NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH

      • “CRISPR/Cas9系统Cas9核酸酶体内代谢行为研究取得进展，为活体基因编辑提供指导。”
        YAN Qinglong,RAN Tiecheng,KONG Huating,ZHANG Jichao,ZHANG Yu,ZHU Ying
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110501
        摘要：BackgroundCas9 nuclease plays an important role in the cleavage of target DNA in the CRISPR/Cas9 (Clustered regulatory interspaced short palindromic repeat/Cas9) system, it is of great guiding significance to study the metabolic behavior of Cas9 nuclease in vivo for gene editing at individual level.PurposeThis study aims to design a safe and efficient fluorescent labeling method for Cas9 nuclease and investigate its metabolism and distribution after tail vein injection in BALB/c mice.MethodsFirst of all, Cas9 protein was labeled with Vivo TagS750 dye via N-hydroxysuccinimide esters, which formed fusion protein with imaging function. In order to obtain better imaging in vivo, we optimized the labeling conditions of Cas9 nuclease including TagS750/protein ratio, reaction temperature, reaction time and reaction pH. Then, we investigated the stability of TagS750-Cas9 protein in different buffer solutions through long-time fluorescence intensity monitoring, and investigated its activity through incubating with PLK1-targeting sgRNA to cleavage the PCR-amplified PLK1 sequence. Finally, the metabolism and distribution of the TagS750-Cas9 protein in vivo were further evaluated. To analyze the blood metabolism of TagS750-Cas9 protein, we tracked fluorescence units at different time points via blood draws. To analyze the distribution of TagS750-Cas9 protein in the tissues, we tracked fluorescence units at 1 h, 4 h, 12 h, 24 h, 48 h, and 72 h by imaging of dissected organs.ResultsExperimental results shows that the optimal conditions were TagS750/protein molar ratio (2:1), 37 ℃, 2 h, and pH=7. Under these conditions, the total labeling yield of TagS750-Cas9 protein was 99%. TagS750-Cas9 protein has good stability in vitro, and the fluorescence labeling did not affect its cleavage activity. Blood metabolism data showed that the mean plasma elimination half-lives (t1/2β) of TagS750-Cas9 protein was 55 h, this suggests that Cas9 is a long-circulating protein. Organ metabolism and distribution analysis revealed that TagS750-Cas9 protein was mainly distributed in liver, kidney, lung, and spleen, but less in heart, and it was nearly completely eliminated from animals by 72 h post-injection.ConclusionThis study lays the foundation for gene editing of Cas9 nuclease at individual level in the CRISPR/Cas9 system.  
        关键词：Cas9 nuclease;Preparation;Distribution;Metabolism   
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        发布时间：2024-10-25

        NUCLEAR ENERGY SCIENCE AND ENGINEERING

      • “在液态熔盐堆领域，研究了7Li富集度对钍铀转换性能的影响，为熔盐堆设计提供参考。”
        ZHOU Jun,CHEN Jingen,YU Chenggang,ZOU Chunyan
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110601
        摘要：BackgroundLithium is an important component of coolant in liquid molten salt reactor (MSR). The neutron absorption cross section of the isotope 6Li is much larger than that of 7Li. Hence, the content of 6Li in the coolant has an important influence on the Th-U conversion performance for MSR.PurposeThis paper aims to provide an appropriate reference for the choice of 7Li enrichment in the engineering design of molten salt reactor by studying the influence of 7Li enrichment in FLi/FLiBe on Th-U conversion performance for molten salt fast reactor (MSFR).MethodsWith the help of molten salt reactor reprocessing sequence (MSR-RS), neutron spectrum, 233U inventory, conversion ratio and 233U net production, evolution of Li and tritium production with 7Li enrichment from 99.5% to 99.995% were explored on MSFR with FLi and FLiBe, respectively.ResultsThe computation results show that MSFR with FLi has a better Th-U conversion performance than that with FLiBe, and the influence of 7Li enrichment on Th-U conversion performance becomes wake when 7Li enrichment is higher than 99.9%. Compared with the 99.995% 7Li enrichment, the Th-U conversion ratio of 99.9% 7Li enrichment decreases by about 1.6% and the tritium production increases by about 8%.ConclusionsConsidering the cost of enriching 7Li and the Th-U conversion performance, a 99.9% 7Li enrichment is recommended for MSFR with both FLi and FLiBe.  
        关键词：FLi;FLiBe;7Li enrichment;Molten salt fast reactor;Th-U conversion   
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      • “在核能领域，专家开发了适用于熔盐快堆的三维稳态核热耦合计算程序，为核热耦合分析提供解决方案。”
        DENG Bin,CHEN Jingen,HE Long,XIA Shaopeng,YU Chenggang,CAI Xiangzhou
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110602
        摘要：BackgroundThere is a strong coupling between the neutronics and thermal-hydraulics in the non-moderated can-type core of molten salt fast reactor (MSFR).PurposeThis work aims to develop and verify coupled code for steady-state neutronics and thermal-hydraulics for the MSFR.MethodsThe coupling code was developed using python programming language to exchange the power distribution, fuel salt temperature and density distributions between OpenMC (Monte Carlo particle transport simulation code) and OpenFOAM (computational fluid dynamics software). Based on the coupling code, a benchmark model of MSFR was established, and the effects of the number of neutonics region division and the different initial conditions on the keff, fuel salt velocity and temperature distributions were studied. Finally, the simulation results were compared with the reference results of MSFR.ResultsThe three-dimensional power distribution, neutron flux distribution, fuel salt velocity field and temperature field distributions can be obtained by using this coupled code. The benchmark of MSFR shows that different initial conditions have no effect on keff, and an alternative number and scheme of neutronics region division are recommended. The simulation results keep a good agreement with the reference results of MSFR.ConclusionsThis coupled code can provide reliable results for the steady-state neutronics and thermal-hydraulics coupling of MSFR.  
        关键词：OpenMC;OpenFOAM;Molten salt fast reactor;Neutronics and thermal-hydraulics coupling   
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      • “在实验物理与工业控制系统领域，新一代归档系统Archiver Appliance在钍基熔盐堆实验装置SF0上应用，性能显著优于RDB Channel Archiver。”
        LI Jiazeng,HAN Lifeng,LI Danqing,HUANG Wenbo,WU Limei,ZHANG Liyuan
        Vol. 42, Issue 11, (2019) DOI: 10.11889/j.0253-3219.2019.hjs.42.110603
        摘要：BackgroundThe history data archived in an experimental physics and industrial control system (EPICS)-based control system for large-scale facility could reach the size of terabyte (TB) over a long period of time. For a large number of history data, the RDB Channel Archiver does not perform well in data retrieval.PurposeThis study aims to implement a stable data storage as well as a faster retrieval system on solid fuel thorium molten salt reactor (TMSR-SF0).MethodsFirst of all, the Archiver Appliance (AA), a new generation of archiving system, was studied in depth and applied to TMSR-SF0 instrument and controls. Compared with the RDB Channel Archiver, the AA system achieved faster retrieval speed, richer web interface including system status view, intuitive chart display, etc. Then, based on the depth analysis of AA system structure, factors related to the query rate were found and verified. Finally, a real-time monitoring tool was developed to display a process variable (PV’s) value change on the web. The concurrency performance test and query performance test were performed on the web interface.Results & ConclusionsThe overall performance of AA system is proved to be better than that of RDB Channel Archiver.  
        关键词：SF0 instrument and control system;Archiving;Archiver Appliance;EPICS   
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