最新刊期
      卷 0 ， 期 0 ， 2020
      • YAN Fen LI Aiguo YANG Ke WANG Hua YU Xiaohan
        Vol. 32, Issue 11, (2009)
        摘要：A data acquisition and motion control system based on EPICS has been developed for hard X-ray microfocus station at Shanghai Synchrotron Radiation Facility (SSRF).The system has been operated under several experimental modes successfully,such as hard X-ray fluorescent mapping,transmission XAFS and fluorescent XAFS.It has been demonstrated that the data acquisition and motion control system is suitable for these applications,with high efficiency,concise interface,and complete functional control.  
        关键词：Hard X-ray microfocus;Data acquisition;EPICS   
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        发布时间：2021-03-12
      • GU Xiaofeng 1 LUO Xiaowei 1,2 DAI Jianping 1 1
        Vol. 32, Issue 11, (2009)
        摘要：Recently,increasing research effort have been made on mini X-ray sources,which are of small size with high quality and low cost.Among them,a mini X-ray source based on bremsstrahlung is of better perspective.In this paper,we report our work on two kinds of bremsstrahlung mechanisms for mini X-ray sources.The photon production per electron of the X-ray production mechanisms are deduced and compared,so as to find the ways to improve them.Experiment on X-ray imaging with thin target bremsstrahlung was carried out to study the imaging quality and the influence on electron beam for the mini X-ray sources.  
        关键词：Mini X-ray source;Bremsstrahlung;X-ray production;Photon number per electron   
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        发布时间：2021-03-12
      • HE Xiaoye CHEN Qitie
        Vol. 32, Issue 11, (2009)
        摘要：The establishment of a horizontal control network is based on the alignment and equipment of NSRL.The magnets benchmark fixed must effectively respond changes of the magnet position.The transition points must be fixed correctly to meet the required for the measurement based on reliable data and used the theory of error compensation and effective methods to calculate the error.Comparing with the defined values we can obtain the errors of magnets and its parameters.A database of all points is established as a reference for the alignment in the future.The correction of the survey can be of help for the error analysis.  
        关键词：Storage ring of NSRL;Horizontal control network;Measurement and adjustment   
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        发布时间：2021-03-12
      • ZHANG Qin ZHANG Yao LI Wenjing YUAN Pingjun FANG Guoping ZHAO Rongfang LU Jiao
        Vol. 32, Issue 11, (2009)
        摘要：In this paper we report the design of an electric heating apparatus for the cooling water system at Shanghai Synchrotron Radiation Facility (SSRF).Our choice for the pipe-heating technique is reasoned,too.Specifications of the heating apparatus and conditions for different connection types of the transformers are given.The heating apparatus has working perfectly for the SSRF cooling water system.  
        关键词：Heating apparatus;Cooling water;Temperature control;SSRF   
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        发布时间：2021-03-12
      • LIU Tianwei 1 JIANG Fan 2 TANG Kai 2 WEI Qiang 2 1
        Vol. 32, Issue 11, (2009)
        摘要：Multi-layered Ti/TiN films,single layer TiN films and gradient TiN films were deposited on uranium substrates by arc ion plating.The anodic polarization experiments in 50 μg/g Cl- solution indicate that E corr of the sample at a pulse bias of ?800 V increases to about 714 mV,with an I corr decrease of about two orders of magnitude.Studying on electrochemical corrosion mechanisms indicates that single layer films and gradient films become inactive by defect penetration through the substrate,hence decreased corrosion-resistance;while the inactivation of multi-layer films is due to layer malfunction,which makes it difficult for corrosive substances to reach the substrate.In this way the corrosion resistance is enhanced.  
        关键词：Uranium;Ti-N films;Corrosion resistance   
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        发布时间：2021-03-12
      • CHEN Shuli 1 ZHANG Qin 1 HAN Jingjing 1 LV Jiangtao 1 WANG Shilong 1 YAO Side 2 1
        Vol. 32, Issue 11, (2009)
        摘要：The protoplast of Trichoderma virid CICC13038 was mutated using Nd:YAG laser of 266 nm light.And a high-cellulase producing strain JG13 was bred by screening with cellulose microcrystalline.Under the condition of 28°C,180 rpm and 72 h of fermentation time,optimal conditions for the celluase ferment by orthogonal experiment were:2% bran as the carbon source,1% (NH 4) 2 SO 4 as the nitrogen source,0.5% Tween-80 as a enzyme-promoting agent,and 25 mL of medium volume in a 250 mL bottle.The cellulase activity of the mutant reached 35.68 U/mL,25.76% higher than that of the original strain under the same conditions.The mutant JG13 has a great potential in industrial production.And it also can be used as the original strain for further mutagenesis to get the strain of higher cellulase activity.  
        关键词：Trichoderma virid;Protoplast;Laser-induced;Cellulase   
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        发布时间：2021-03-12
      • ZHANG Zhuwu 1 CHENG Huansheng 2 GAN Fuxi 1,2 1
        Vol. 32, Issue 11, (2009)
        摘要：External-beam proton induced X-ray emission (PIXE) is a high-sensitive,non-destructive and multi-element quantitative analysis method,which can be used to analyze the variety and content of major and trace elements of Chinese archaic jades and jade mineral samples.In this paper,the analysis results of the variety and content of major and trace elements of several Chinese archaic jades and jade mineral samples are presented,which are shown that the external-beam PIXE can be a useful tool for identifying the geological formation of jade minerals and source of Chinese artifacts.  
        关键词：Chinese archaic jade;Trace element;PIXE   
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        发布时间：2021-03-12
      • WANG Mingwei ZHANG Yongping ZHANG Yingjian YUAN Huiyu GAO Zhiqi
        Vol. 32, Issue 11, (2009)
        摘要：16α-[18F]fluoro-17β-estrogen (18F-FES) is a specific molecular imaging probe of estrogen receptor of breast cancer and has been applied into the clinic diagnosis of breast cancer by PET/CT imaging for the optimization of treatment plan,monitoring of treatment efficiency,improvement of treatment outcome and reduction of treatment cost.A fast,reliable automated synthesis procedure of 18 F-FES was developed by modifying a commercial Explora FDG 4 module based on a "two-step,two-pot" radiochemical process and a simple separation way via solid phase extraction (SPE) in this study.In the first step,radiofluorination of precursor 3-O-(methoxymethyl)-16,17-O-sulfuryl-16-epiestriol and activated 18 F ion was carried out at 100°C for 10 min to form 18 F-labeled intermediate,which was separated via SPE based on silica column,so as to remove the non-reacted starting materials.In the second step,acidic hydrolysis of 18 F-labeled intermediate was heated at 90°C for 10 min to produce the target product 18 F-FES,which was purified by a serial column consisted of two C18 and one Al 2 O 3 cartridges.This newly developed production procedure of 18 F-FES could be completed within 70 min with radiochemical yield of about 30% and radiochemical purity of over 95%.  
        关键词：Breast cancer;18F-FES;Automated synthesis;FDG 4 module   
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        发布时间：2021-03-12
      • GUO Congying 1 ZHANG Zhengwei 1,2 ZHU Jianhua 1 QIAN Jun 1 YANG Yang 1 SHEN Haixing 1 1
        Vol. 32, Issue 11, (2009)
        摘要：This work is aimed at synthesizing an 18F-labelled folate derivative that can be used as folate-receptorinduced tumor PET imaging agent.Under the optimal reaction and testing specification formulated during the cold-labeling experiments,18F labeling of folic acid was achieved in three steps of 18F pre-labeling,bromination and esterification.The receptor binding property of the newly-synthesized folate radio-derivative was studied through β-lactoglobulin binding test.Tumor-bearing nude mice injected with the new compound were used to study whether the derivative can accumulate within tumor issue.Preliminary studies in vitro and in vivo showed that this new PET agent still possessed receptor binding qualities of folic acid.18F-flurophenethyl folate remained good affinity and specificity with β-lactoglobulin.Accumulation of activities in tumor tissues was found in tumor-bearing nude mice.A new folate receptor ligand:18F-flurophenethyl folate was synthesized,with high yield and good stability.Since the pre-labeling method was used,the fluorine labeling was not directly imposed upon folic acid.In this way,the structure destruction,which happens in high temperature reaction of folic acid,can be avoided.The synthesized folate derivative remained the binding structural quality of folic acid and could bind with the folate-binding protein:β-lactoglobulin.Through the folate receptors located on tumor tissues,18F-flurophenethyl folate accumulated in the tumor tissue,exhibiting its potential as a tumor PET imaging agent.  
        关键词：Folate receptor;18F-labeling;PET   
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        发布时间：2021-03-12
      • WANG Lijuan WU Hubing WANG Quanshi WANG Mingfang ZHOU Wenlan LI Hongsheng
        Vol. 32, Issue 11, (2009)
        摘要：PET/CT scan was performed for 30 newly diagnosed esophageal carcinoma patients within the week before operation and radio-and/or chemo-therapy.The diagnosis of esophageal carcinoma was established according to the histopathology examination.In 15 patients with operation,the findings of PET/CT of 130 regional lymph nodes were compared with the histopathology examination.The distant metastasis of all patients and the regional lymph node metastasis of 15 patients without operation were diagnosed by the pathological examination,other imaging findings or/and clinical follow up for over 6 months.The results show that all the primary lesions had very intense 18F-FDG uptake.The sensitivity of PET/CT was 100%.The lymph nodes metastasis was proved in 20 patients (66.7%).PET/CT was true positive in 18patients,false positive in 2 patients.The sensitivity,specificity and accuracy of PET/CT were 90.0%,80.0% and 86.7%,respectively,based on the case study.In 130 excised lymph nodes of 15 patients with the operation,23 of 33 lymph nodes metastasis were detected by PET/CT.The sensitivity,specificity and accuracy of PET/CT were 69.7%,97.9% and 90.8%,respectively,based on the lesion study.PET/CT detected the distant metastasis in the liver,lung and bone in 4 cases.After PET/CT imaging,the staging of tumor in 16 patients was improved,1 was lowered,and 13 was concord with pre-staging.18F-FDG PET/CT plays an important role in the diagnosis and staging for esophageal cancer.  
        关键词：Esophageal neoplasms;Staging;Tomography;Emission-computed;X-ray computed;Deoxyglucose   
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        发布时间：2021-03-12
      • HUANG Hongquan FANG Fang GONG Dichen ZHOU Wei
        Vol. 32, Issue 11, (2009)
        摘要：In this paper,according to the random characteristic of pulse amplitude and time interval of two adjacent pules,we discuss simulation methods of nuclear signal statistical distribution.When energy randomness of nuclear random signal is simulated,the statistical distribution can be decomposed into uniform distribution,Gaussian distribution,exponential distribution,Poisson distribution,multinomial distribution etc,and can be realized by methods we proposed in this paper.Arbitrary energy distributed nuclear signal that cannot be decomposed easily can also be realized by the methods,and simulation effect is excellent.  
        关键词：Nuclear random signal;Simulation;Basic distribution;Arbitrary distribution   
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        发布时间：2021-03-12
      • SUN Bai LI Minqiang ZHONG Yu ZHANG Fang LU Wei KANG Nansheng LIU Jinhuai
        Vol. 32, Issue 11, (2009)
        摘要：We have developed an energy dispersive X-ray scatter experimental platform for detecting contraband.NaCl has been used as a standard sample to verify the accuracy,reliability and energy resolution of the equipment.The lattice constants of NaCl calculated from the energy dispersive curves obtained by the equipment are in accord with the standard X-ray diffraction data―PDF (Powder Diffraction File) issued by the International Centre for Diffraction Data.The equipment demonstrates a high energy resolution,where the primary peak of NaCl at 15.82 keV has a resolution of 0.348 keV (FWHM).The equipment was also used to detect common explosive (TNT) and common drug (heroin),where the characteristic energy dispersive patterns of the two kinds of materials have been acquired at different detecting angles.Among all the measured detecting angles,more diffraction peaks and higher intensities in those peaks are demonstrated at detecting angles of 10° and 12°.The results indicate that these two detecting angle are possibly more suitable for detecting TNT and heroin.  
        关键词：Energy dispersive;X ray scatter;Drug;Explosive   
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        发布时间：2021-03-12
      • GU Min GE Liangquan
        Vol. 32, Issue 11, (2009)
        摘要：The method of Gaussian peak area computation includes count accumulation method and least squares fitting of Gaussian function.The latter is based on solving inverse matrix.This requests considerable computing time,and is sensitive to noise.In this article,we obtain the amplitude,center and variance of Gaussian function by using the second eigenfunction of Gaussian function,and area of Gaussian peak is calculated.Results of applying this new method to γ-ray spectra analysis show that it is not only of quick speed but also insensitive to noise.  
        关键词：Gamma spectrometry;Peak area;Least squares fitting;Eigenfunction   
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        发布时间：2021-03-12
      • ZHANG Mei PENG Bodong SHENG Liang DU Hongliang WEI Fuli WANG Peiwei LI Yang YUAN Yuan ZHAO Jizhen LI Chunhua
        Vol. 32, Issue 11, (2009)
        摘要：This work is aimed at developing the technique of multi-channel scintillator-fiber detector.In this paper,theoretical gamma sensitivity of a fiber detector was formulated for calculating the relative sensitivity of LSO and ST401 scintillator-fiber detectors.Outcomes of the calculation were validated by experiment with a 60 Co source.The results show that sensitivity of an LSO scintillator-fiber detector of 10-mm thicknesd is about 19 times higher than the system using ST401 with the same size of LSO detector.The theoretical results agree with the experimental data.  
        关键词：Scintillator-fiber detector;Gamma sensitivity;Coupling efficiency   
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        发布时间：2021-03-12
      • ZHANG Jingyao WANG Nanping
        Vol. 32, Issue 11, (2009)
        摘要：In this paper,we simulate a NaI(Tl) scintillation detector responses at different source-detector distances,energy resolutions of the detector and computer time,with models of a point 137Cs source and a planar 137Cs source.Measurement was performed with a 137Cs point source and the NaI(Tl) γ-ray spectrometer.The MC simulated spectra and the measured data are in good agreement.  
        关键词：Monte Carlo;137Cs simulation;NaI (Tl) gamma-ray spectrometer   
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        发布时间：2021-03-12
      • WANG Xiaoying 1 HE Lifeng 2 BAI Bing 1 WU Xiangchao 2 LIU Tingting 1 TANG Xiane 2 ZHANG li 2 XU fang 2 ZHAO Lifang 2 1
        Vol. 32, Issue 11, (2009)
        摘要：Split-Hopkinson pressure bar testing and microscopy were used to determine the dynamic mechanical properties and the microstructure in the strain rate range of 10 2-10 4/s for U-5.7Nb alloy samples.The experimental results showed that the dynamic yield strengths were higher than corresponding static values,and the failure was sensitive to the strain rate.Microscopic examinations revealed that the breaking (or breakdown) of specimen frequently occurred along the shear band at the strain rate of 4300/s and stress of 64%.A hemicyclic shear band appeared on the transverse section of the specimens,and this could be determined by analyzing the stress distribution.  
        关键词：Dynamic mechanical properties;Failure;Adiabatic shear band   
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        发布时间：2021-03-12
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