Development and application introduction of industrial electron accelerator and surface treatment implementation with an ion beam made in China
Fei WANG, Xuexian LI, Enming JIA, Weiwei QIU, and Linxia FAN
The S-band electron linear accelerator developed for nondestructive testing is primarily used to inspect pressure vessels, petrochemical parts, and other industrial components. The X-band electron linear accelerator has been developed in RIAMB, owing to its advantageous flexibility and light weight and can be used for on-site testing. The integral solution of the irradiation electron linear accelerator system provided by RIAMB includes an accelerator, transmission line, production management system, automatic storage and retrieval system, and workshop. The electrocurtain accelerator is currently being developed in RIAMB. At present, it includes two models, with maximum accelerating voltages of 200 kV and 150 kV, respectively. The ion beam surface processing technology includes ion implantation surface modifications, magnetic filtration multi-arc ion coatings, and ion beam assisted deposition coatings. It forms a corrosion-resistant, friction-resistant, anti-icing, and friction-reducing film on the surface of parts such as bearings and pitot tubes, which are primarily used in the aerospace field.
  • Jan. 04, 2023
  • Journal of Radiation Research and Radiation Processing
  • Vol. 40, Issue 6, 061301 (2022)
  • DOI:10.11889/j.1000-3436.2022-0079
Damage of γ ray irradiation to properties of Ce doped bismuth titanate ferroelectric thin films
Zan WANG, Chunxiang GAO, Jing ZHANG, Yuehong ZHANG, and Man XU
A series of ferroelectric thin films of Bi3.25Ce0.75Ti3O12 (BCTO) was deposited on a composite substrate of Pt/Ti/SiO2/Si through the sol-gel method, and the deposited films were irradiated with different doses of gamma rays. The crystal structure, surface morphology, ferroelectricity, leakage, and anti-fatigue properties of the deposited films before and after irradiation were compared by thermogravimetric differential scanning calorimetry (TG-DSC), X-ray diffraction (XRD), scanning electron microscope-energy dispersive spectrometer (SEM-EDS) and ferroelectric tester. The results showed that an increase in absorbed γ ray doses, didn't change the crystal structure of films. The ferroelectricity of the deposited films decreased significantly with the residual polarization 2Pr decreasing from 51.5 μC/cm2 to 23.7 μC/cm2. The leakage current density of the films increased slightly from 0.9×10-7 A/cm2 to 7.2×10-7 A/cm2. Some of the films showed fatigue performance after 1012 polarization switching cycles.
  • Jan. 04, 2023
  • Journal of Radiation Research and Radiation Processing
  • Vol. 40, Issue 6, 060202 (2022)
  • DOI:10.11889/j.1000-3436.2022-0070
Path planning for nuclear radiation environments based on an improved artificial potential field A* algorithm
Mengwen QIU, Hua ZHANG, and Huaifang ZHOU
In order to enhance the path planning application of the transfer robot in a nuclear radiation environment, this paper addresses the problem of lack of influence from the surrounding environment on the path by the traditional A* algorithm, and introduces the idea of an artificial potential field in the nuclear radiation environment to improve the evaluation function of this algorithm. This was achieved by obtaining the sum of the radiation source repulsion function, obstacle repulsion function, and target point gravitational force function to calculate the combined force received in the grid, thereby ensuring that the planned path is far from the surrounding environment. For the improved A* algorithm, the MATLAB simulation experiments showed a decrease in the nuclear radiation dose by 52.11%~55.29% compared with the traditional A* algorithm, and a decrease in the number of search nodes by 34.67%~46.19% compared with other improved algorithms. Moreover, the safety distance with the radiation sources and surrounding obstacles was constantly maintained, providing a better implementation effect and allowing the verification of the effectiveness and superiority of the improved A* algorithm.
  • Jan. 04, 2023
  • Journal of Radiation Research and Radiation Processing
  • Vol. 40, Issue 6, 060601 (2022)
  • DOI:10.11889/j.1000-3436.2022-0054
Study on sterilization effects and mechanisms of contact glow discharge plasma on Actinomucor elegans
Ting WANG, Qianggui WAN, Yuhong XU, Lipeng TIAN, Meng CAI, and Lumei PU
Mucormycosis infected by Actinomucor elegans is relatively serious in the population, so it is urgent need to inactivate Actinomucorelegans. In order to investigate the sterilization effect and mechanisms of contact glow discharge plasma (CGDP) on Actinomucor elegans, the effects of voltage, time and electrolyte on sterilization efficiency were investigated, and the sterilization conditions were confirmed. The sterilization mechanism of CGDP on Actinomucor elegans was explored by analyzing the changes of colony morphology, spore content leakage and peroxidation damage that induced by CGDP treatment. The results showed that CGDP had remarkable sterilization effects on Actinomucor elegans, under the conditions of 560 V, 15 min and Na2SO4 solution, the sterilization rate (η) was up to 90.71%, the colony diameter, spore germination rate and mycelial biomass accumulation all decreased significantly after CGDP treatment, while leakage of intracellular components and degree of peroxidation damage increased, and spore surface became shrinking and rupturing. It was concluded that the Actinomucor elegans was inactivated due to cell membrane integrity destroying induced by CGDP. The results of this paper could provide a reference for the application and mechanism research of CGDP in the field of fungicidal.
  • Jan. 04, 2023
  • Journal of Radiation Research and Radiation Processing
  • Vol. 40, Issue 6, 060402 (2022)
  • DOI:10.11889/j.1000-3436.2022-0043
Dose coefficient estimation for terrestrial Sphingonotus insects near nuclear facilities in Northwest China
Wenjing GONG, Chao ZHANG, Sheng ZHANG, Huijuan WANG, Qiao CAO, Han YUAN, Jianguo LI, and Baohua HAN
To study the representative dose coefficients near nuclear facilities in the arid regions of Northwest China, a simplified anatomical model of Sphingonotus insects using computed tomography (CT) scanning is proposed. In addition, a voxel model created by using Photoshop and Python is used to assess the results of the simplified anatomical model. The dose coefficients of internal and external 90Sr and 137Cs irradiation on different organs of Sphingonotus insects in the environmental medium are calculated. To verify the feasibility of the proposed model, the results are compared with the dose coefficients reported in the International Commission on Radiological Protection (ICRP)Publication 108. Based on the simplified model adopted by ICRP to arrive at the results reported in Publication 108, the average value of dose coefficients of each organ of the insect is used to calculate the results presented in this paper. The dose coefficients of internal and external 90Sr irradiation for the simplified anatomical model of Sphingonotus were found to be 6.59×10-4 μGyh-1/Bqkg-1 and 6.74×10-4 μGyh-1/Bqkg-1, respectively. Meanwhile, the dose coefficients of internal and external 137Cs irradiation for the simplified anatomical model were 1.34×10-4 μGyh-1/Bqkg-1 and 4.40×10-3 μGyh-1/Bqkg-1, respectively. The dose coefficients were 7.87×10-4μGyh-1/Bqkg-1 and 6.74×10-4μGyh-1/Bqkg-1, respectively. The dose coefficients were 1.33×10-4μGyh-1/Bqkg-1 and 3.51×10-3μGyh-1/Bqkg-1, respectively. The dose coefficients of internal and external 90Sr radiation for reference insects as reported in the ICRP Publication 108 were 1.00×10-2 μGyh-1/Bqkg-1 and 3.90×10-10 μGyh-1/Bqkg-1, respectively. Moreover, the dose coefficients of internal and external 137Cs radiation in the ICRP Publication 108 were 3.20×10-3 μGyh-1/Bqkg-1 and 2.80×10-3 μGyh-1/Bqkg-1, respectively. The above data indicate that the dose coefficients of internal irradiation reported in the ICRP Publication 108 are larger than those calculated using the proposed dosiological model, whereas those of external irradiation in ICRP Publication 108 are smaller. This trend is probably related to the size of the organism, decay rate, and energy of radionuclides. The adoption of a simplified anatomical model, morphologically similar to the organism, and a voxel model, highly overlapping with the organism, in this study allows a visualization of the real exposure situation for the organism considered with high accuracy, proving the feasibility of the insect dosimetry model established in this study.
  • Jan. 04, 2023
  • Journal of Radiation Research and Radiation Processing
  • Vol. 40, Issue 6, 060702 (2022)
  • DOI:10.11889/j.1000-3436.2022-0049
Knowledge graph analysis of current situation and trend in Chinese medicine sterilization
Xin LIAO, Shi WANG, Yuan CAI, Penghui LI, Yu SUN, Xinyuan XU, and Yanmei PENG
Traditional Chinese medicine (TCM) is applied in various forms, such as decoction pieces, raw powder, extract, and patent Chinese medicine, etc. Controlling exogenous microbial contamination, ensuring the safety and effectiveness of traditional Chinese medicine, and selecting the appropriate sterilization technology are the key factors regarding its use. In this study, the literature on sterilization of TCM published from 2001 to 2021 was retrieved from CNKI, Wanfang, VIP, and Web of Science. Subsequently, visualization analysis software named VOSviewer and CiteSpace were used to analyze the application status and trend in TCM sterilization methods in the past 20 years. After screening was performed, 322 studies were included. The journal that published the highest number of studies on TCM sterilization was Electromechanical Information. The author's cooperative network analysis found that the Chinese medicine sterilization field mainly formed the China Institute for Food and Drug Control and Guangzhou Institute for Drug Control and other core research teams. Keywords in the literature show that the research on TCM sterilization of traditional Chinese medicine mainly focuses on irradiation, microwave, preparation process, active ingredients, drying, fingerprint, etc. The advantages and disadvantages of different sterilization technologies and their suitable scopes, combined with the future development trend in TCM sterilization, were comprehensively discussed for in-depth analysis, to provide a reference for researchers in selecting appropriate sterilization methods. To further promote the scientific development of TCM sterilization, the authors propose that TCM sterilization should be closely combined with technology, equipment, and policy in the future to facilitate rapid modernization of TCM.
  • Jan. 04, 2023
  • Journal of Radiation Research and Radiation Processing
  • Vol. 40, Issue 6, 060401 (2022)
  • DOI:10.11889/j.1000-3436.2022-0036
Study on the therapeutic mechanism and effect of metformin combined with single high-dose radiotherapy in mice with non-small cell lung cancer
Huichao LI, Mingjuan ZHAO, and Long TIAN
To explore the therapeutic effect of metformin combined with single high-dose radiotherapy in mice with non-small cell lung cancer and the mechanism involved. Invitro cell test: the cytotoxicity of metformin under different oxygen and glucose contents was evaluated using cell survival curves. Invivo xenograft tumor test: NSCLC-A549 cells were injected into mice, which were then divided into the following five groups: control group, metformin group, single high-dose radiotherapy group, metformin 1 h before radiotherapy group, and metformin 24 h after radiotherapy group. Growth of the tumor was evaluated in each group, and the blood flow and histology of the tumor tissues were analyzed. According to the invitro test results, metformin was the most cytotoxic under hypoxic and low-glucose conditions. The in vivo results showed that the tumor volume was the smallest in the mouse groups administered metformin 1 h before high-dose radiotherapy and 24 h after radiotherapy ((0.47±0.12) cm3 and (0.49±0.21) cm3, respectively). Blood flow analysis showed that single high-dose radiotherapy destroyed the micro-vessels of tumor tissue and reduced the perfusion of oxygen and glucose. Histological analysis revealed that cells in hypoxic and hypoglycemic area of the tumor tissue center were preferentially killed by metformin, whereas there were viable cells in the surrounding well perfused areas. Metformin combined with single high-dose radiotherapy enhanced the toxicity by changing tumor cell metabolism. These results provide theoretical and data support for the future use of metformin combined with stereotactic body radiotherapy.
  • Jan. 04, 2023
  • Journal of Radiation Research and Radiation Processing
  • Vol. 40, Issue 6, 060301 (2022)
  • DOI:10.11889/j.1000-3436.2022-0040
Numerical simulation of steam bubble dynamics at microcrack in LBE descending flow field
Weijian DONG, Tenglong CONG, Junzhi ZHU, Yao XIAO, Xumao ZOU, and Hanyang GU
BackgroundWhen steam generator tube rupture (SGTR) occurs in the lead-bismuth cooled fast reactor, high pressure water/steam flows into the primary side filled with high temperature liquid metal. According to the location and size of the rupture, the leakage behaviors of the rupture may involve leak-before-break (LBB), single-phase critical flow or two-phase critical flow. Under the action of high temperature liquid metal, different forms of heat and mass transfer behaviors occur in the two-component multiphase system of water-metal, which has an important influence on the safe operation of the lead-bismuth cooled fast reactor.PurposeThis study aims at the bubble dynamic behavior in the descending flow field of liquid lead-bismuth alloy (LBE) in the tube bundle in different stages of SGTR caused by microcrack on the surface of the heat transfer tube during the drying stage and low flow single phase steam permeates the primary side.MethodsBased on the VOF method, a numerical simulation model of steam-LBE two-phase flow and phase interface capture was established to study the bubble growth and transport behaviors from single tube or 3×3 tube bundle in the downward flow field of high temperature LBE. The SST k- ω model was employed to solve the turbulence equation. The physical law of steam bubble movement was analyzed and its influence on the heat transfer and operation stability of steam generator was evaluated.ResultsThe results show that the dynamics behaviors of steam bubbles in the descending flow field are quite different from these in static liquid or upward flow. The steam bubbles may slide along the heat transfer tube surface after departure from the crack under the actions of LBE descending flow field and buoyancy. The steam bubbles may form a steam film covering the heat transfer tube surface or accumulate by quantity in the bundle.ConclusionsThese phenomena adversely affects the flow stability of the LBE and the heat transfer of the steam generator.
  • Jan. 03, 2023
  • NUCLEAR TECHNIQUES
  • Vol. 45, Issue 12, 120605 (2022)
  • DOI:10.11889/j.0253-3219.2022.hjs.45.120605
Low level radio frequency controller for superconducting third harmonic cavity at SSRF
Zhigang ZHANG, Yubin ZHAO, Kai XU, Xiang ZHENG, Qiang CHANG, Shenjie ZHAO, Zhenyu MA, Hongru JIANG, Wenfeng YANG, Xuefang HUANG, Yan WANG, Jing SHI, and Hongtao HOU
BackgroundThe superconducting third harmonic cavity has been developed independently in Shanghai Synchrotron Radiation Facility (SSRF) and passed beam tests. The cavity electric field needs to be precisely controlled during operation to achieve the goal of stretching beam cluster and improving beam life.PurposeThis study aims to design a digital low level radio frequency (DLLRF) controller for superconducting third harmonic cavity at SSRF.MethodsThe hardware of controller was based on a field-programmable gate array (FPGA) board and a front-end board whilst in-phase/quadrature (I/Q) demodulation techniques were implemented in the software of controller. A synergistic strategy was adopted for driving the stepper motor with slow tuning speed and piezoelectric ceramic with fast tuning speed, and an algorithm for the quench detection for passive cavity. Finally, experimental tests were performed to verify the effectiveness of this designed DLLRF.ResultsWhen the state is in top-up mode over 120 mA, the amplitude stability has improved form ±5% with open loop to less than ±1% with close loop, the voltage of piezo has varies smoothly and stably within 120 V, and the beam life has improved more than doubled.ConclusionA digital low level radio frequency controller for the superconducting third harmonic cavity has been designed and satisfies the requirements for SSRF.
  • Jan. 03, 2023
  • NUCLEAR TECHNIQUES
  • Vol. 45, Issue 12, 120101 (2022)
  • DOI:10.11889/j.0253-3219.2022.hjs.45.120101
The design of Hefei advanced light facility timing system
Gangjia ZHAI, Xiaokang SUN, Ke XUAN, Liuguo CHEN, Chuan LI, and Gongfa LIU
BackgroundHefei Advanced Light Facility (HALF) is a fourth-generation synchrotron radiation light source based on diffraction-limited storage ring. The timing system provides trigger signals for the HALF injector, storage ring and beamline, coordinates injection and beam measurement, and achieves filling of the storage ring bucket with any designated bunch pattern.PurposeThis study aims to design a timing system for HALF to reduce the trigger signal jitter of the HALF device to less than 30 ps, and stabilize the signal drift caused by the optical fiber length change.MethodsBased on the MTCA.4 event-driven products from Micro-Research Finland Oy (MRF), the event timing technology scheme was adopted to implement the timing system. Appropriate system frequencies for electron gun, microwave system and storage ring were selected to achieve different modes of storage ring bucket filling scheme. The timing system software was developed under Experimental Physics and Industrial Control System (EPICS) to coordinate with the control system of HALF, including an EPICS driver, database records, and operation interfaces. Delay compensation was applied to signal drift caused by the variation of optical fiber length. Finally, a prototype of the timing system was developed for performance tests.Results & ConclusionsThe results show that the jitter of the trigger signal is less than 24 ps, and the signal drift is controlled at about 3 ps after delay compensation, both meet the design requirements of HALF timing system.
  • Jan. 03, 2023
  • NUCLEAR TECHNIQUES
  • Vol. 45, Issue 12, 120102 (2022)
  • DOI:10.11889/j.0253-3219.2022.hjs.45.120102