最新刊期
      卷 0 ， 期 0 ， 2020
      • DENG Biao YU Xiaohan XU Hongjie
        Issue 5, (2007)
        摘要：Hard X-ray microbeam (microprobe) of a synchrotron radiation facility has become a mainstream tech- nique in a number of scientific disciplines. Various micro-focusing methods of the hard X-rays and applications of the hard X-ray microbeam are reviewed in the paper. The focusing principle, advantages and disadvantages, and development of the methods are discussed.  
        关键词：Hard X-rays;Synchrotron radiation;Microbeam;Focusing   
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        发布时间：2021-03-12
      • ZHANG Meng ZHAO Minghua
        Issue 5, (2007)
        摘要：To guarantee reliability of the sub-harmonic buncher (SHB) cavity for the SSRF linac, the program of MultiPac was used to simulate multipacting effect, a possible cause of perturbing injection stability, and to optimize the cavity design. Simulation results of the SSRF cavity, and a simple reentrant cavity as a comparison, show that the optimized SHB cavity can be free from the multipacting effect, as the smooth corner and nose of the cavity can sup- press the multipacting process effectively.  
        关键词：Sub-harmonic buncher;Multipacting;Counter function;Simulation   
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        发布时间：2021-03-12
      • YANG Jianhong1,2 FEI Yurong2 CAO Yi2,3 WANG Ruilin2 HUANG Yuying4 HE Wei4 LIU Jing1 1
        Issue 5, (2007)
        摘要：To investigate the relationship between bone element contents and bone mineral density (BMD), left fe- mur of sham-operated rats (SHAM, n=5), ovariectomized rats (OVX, n=5) and antler hemo-treated ovariectomized rats (OVX+ antler hemo, n=5) were analyzed by synchrotron radiation X-ray fluorescence (SRXRF) microprobe. The results showed that there were very good positive correlations among contents of Ca, P, Zn and Sr. In comparison to the SHAM group, decreased relative intensities of Ca, P, Zn and Sr (especially Ca and P, p<0.05) were observed in femur of the OVX group, which showed significant decrease (p<0.05) of the BMD. The results indicate that loss of Ca and P in bone will cause osteoporosis. On the other hand, increased relative intensities of Ca, P and Zn in femur, and the BMD (p<0.05), of the anlter hemo-treated OVX group were found, in comparison to the OVX group. This suggests that anlter hemo may help cure osteoporosis through maintaining bone contents of Zn, Ca and P, and increasing the BMD.  
        关键词：Element analysis;Osteoporosis;Femur;Bone mineral density;Synchrotron radiation X-ray fluorescence   
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        发布时间：2021-03-12
      • DENG Xiaoguo1,2 ZHOU Sizhong1 XIONG Rensheng1 1
        Issue 5, (2007)
        摘要：Hinge technology is used to study focusing behavior of a sagittal focusing crystal monochromator. A mathematical model describing the relationship between actuator displacement and dynamic bending radii has been established by studying geometry parameter of the hinge. Influential factors on resolution of the bending radii were analyzed. The model has been successfully applied in developing a sagittal focusing crystal monochromator for the SSRF (Shanghai Synchrotron Radiation Facility) project. The testing result indicated that focusing spot of the sagittal focusing crystal monochromator achieved satisfactorily the design requirement.  
        关键词：Sagittal-focusing;Crystal-monochromator;Hinge;Actuator   
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        发布时间：2021-03-12
      • SUN Lijuan CUI Mingqi ZHU Jie ZHAO Yidong TIAN Yulian ZHENG Lei CHEN Kai MA Chenyan ZHAO Jia ZHOU Kejin
        Issue 5, (2007)
        摘要：An assembly of microchannel plate (MCP) detectors was calibrated absolutely using a sili- con-photoelectron-diode as a transfer standard detector on the soft X-ray beamline 3W1B of Beijing Synchrotron Ra- diation Facility (BSRF). Calibration results of energy response efficiency of the MCP detector for 50-250eV pho- tons were given. Using the MCP detector, energy spectra and characteristic polarization of the synchrotron radiations were measured with satisfactory results.  
        关键词：Synchrotron radiation;Soft X-ray;Microchannel plate;Energy response efficiency;Calibration   
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        发布时间：2021-03-12
      • DAI Haiyang WANG Zhi’an HUANG Ningkang
        Issue 5, (2007)
        摘要：Chromium oxide films were prepared at room temperature by ion-beam assisted deposition (IBAD), in which chromium was deposited by 1 keV Ar+ ion sputtering on stainless steel substrates before bombarding the film by 100 keV Ar+ or O+ beam, while pure oxygen gas was introduced into the vacuum chamber. The film samples were characterized by XPS and AES. The results show that components of the films prepared by Ar+ beam bombardment are mainly Cr2O3, whereas the films bombarded by the O+ beam consist of oxides of different chromium valences. The films prepared by the Ar+ beam bomnbardment have less carbon contamination than those by O+ beam. In comparison to the O+ ion bombardment, and the reactivity of oxygen molecules with deposited Cr atoms in the films bombarded by the Ar+ ions is enhanced, and the film sample bombarded by the Ar+ ions has a thicker transition layer (about one-third thicker), hence an increased adhesion of the film to the substrate.  
        关键词：Chromium oxide film;Ion-beam assisted deposition;X-ray photoelectron spectroscopy;Auger electron spectroscopy   
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        发布时间：2021-03-12
      • PANG Jufeng TIAN Yajuan
        Issue 5, (2007)
        摘要：A neutron-gamma ray logging software package based on Monte Carlo simulation is introduced in this paper. It can be used for calculating space, energy and time distributions of the of neutron-gamma ray. In an open hole well without any instrument, oil-saturated sandstone formation and injected water in it, computer simulations can be done with the software package for energy and time distributions of the neutron-gamma rays, generating neutron- gamma ray spectra at various source distances in the borehole axis and wall. Influences of the source distances on neutron-gamma ray distributions and on neutron-gamma ray spectra in borehole axis and wall were discussed.  
        关键词：Monte Carlo simulation;Neutron-gamma ray logging;Source distances;Gamma ray spectra;Oil sand- stone formation;Water in borehole   
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        发布时间：2021-03-12
      • WANG Guangfu 1 LU Yongfang 2 1
        Issue 5, (2007)
        摘要：The influence of sample position on analyzing Ar, Si, Ca and Fe by external beam PIXE was studied by changing the position or direction of a GBW07306 sample. Precision requirements of sample–detector distance and incidence angle of the proton beam was determined. To control the PIXE analysis results with an accuracy of better than 5%, the displacement of sample position should be within ±0.14mm and the angle change within ±1.2° .  
        关键词：External beam proton induced X-ray emission;GBW07306 sample;Position;Error   
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        发布时间：2021-03-12
      • WANG Chongjie1 CHENG Song1 ZHANG Ailian2 1
        Issue 5, (2007)
        摘要：In this paper, efficiency function of an area source of HPGe γdetector is investigated, and the method of determining parameters of the function by standard volume sources and GA(Genetic Algorithms) is established. As an application, double-layer samples of 226Ra、232Th and 40K in given cincents were analyzed. The results agree well with the established values. The method can be used for nondestructive analysis of samples with one-dimensional nonuniform distribution of radio nuclides.  
        关键词：HPGe γ detector;Area source efficiency;Genetic algorithms;γ spectrum analysis   
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        发布时间：2021-03-12
      • HAO Shumei1,2 GE Min1,2 WANG Wenfeng1 ZHAO Hongwei1 1
        Issue 5, (2007)
        摘要：Terahertz spectroscopy is a new useful technique based on femto-second technology. With its unique fre- quency range, the technique has been applied to detection and analysis of gas free radicals and reactive molecules which are usually difficult to be measured by alternative methods. In this paper, we briefly introduce THz spectros- copy to detect free radicals and measure gas-phase molecules with high accuracy and its applications in studies on solution dynamics and charge transfer.  
        关键词：Free radical;THz spectroscopy;Charge transfer   
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        发布时间：2021-03-12
      • intratracheal instillationXU Jingying1,2 LI Jungang1,2 RAN Tiecheng1,2 WU Shengwei1 LI Wenxin1 LI Qingnuan1 1
        Issue 5, (2007)
        摘要：Biodistribution of nanomaterials after lung exposure will be helpful to gaining an insight into the pulmo- nary toxicity. To observe distribution of C60（OH）x after lung exposure, radiolabel technique and single photon emis- sion computed tomography （SPECT） imaging was used in this experiment. The biodistribution of 99mTc-C60（OH）x in Sprague-Dawley （SD） rats after intratracheal instillation was studied. C60（OH）x （x=22,24） were labeled with 99mTc and the radiolabeling yield of 99mTc-C60（OH）x was greater than 93%. The 99mTc-C60（OH）x showed a high stability both in vivo and in vitro. Biodistributions of Na99mTcO4 or 99mTc-C60（OH）x in SD rats after intratracheal instillation were ob- served by SPECT imaging. Unlike the distribution of Na99mTcO4, a large proportion of the 99mTc-C60（OH）x was re- tained in lung, while a small amount of 99mTc-C60（OH）x penetrated the alveolar-capillary barrier, diffusing into circu- lation promptly after I.T. and distributing mainly in the liver, bone and spleen, a significant character of biodistribu- tion of nanomaterials. It seems that the ability of crossing over the alveolar-capillary barrier is dependent on size of the nanomaterials. The results provide valuable data for pulmonary toxicological study of nanomaterials.  
        关键词：99mTc;C60（OH）x;Single photon emission computed tomography imaging;Biodistribution;Intratracheal instillation   
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        发布时间：2021-03-12
      • ZHAI Shizhen1 DU Jin1,3 SHEN Yijia2 HU Chunlin2 HE Chuan2 ZHAO Lei1 1
        Issue 5, (2007)
        摘要：Natural somatostatin （SMS）, dextran-70 (Dx70) and a bifunctional chelator 2- methyl-6-（p-amidobenzyl） -diethylenetriaminepentaacetic acid （1B4M-DTPA） were used to synthesize a novel somatostatin-dextran-DTPA (SMS-Dx70-DTPA) conjugate and radiolabeled with 90Y. An in vitro somatostatin receptor competition binding study was carried out by using 125I-Tyr3-Octreotide as a radioligand to measure the IC50 value of SMS-Dx70-DTPA. Bio- distribution and blood half-life of 90Y-DTPA-Dx70-SMS were investigated in normal rats. The results show that SMS-Dx70-DTPA has a high receptor binding affinity to somatostatin receptor subtype 2, with the IC50 value being in the same range as somatostatin. The blood half-life of 90Y-DTPA-Dx70-SMS in normal rats was 6.39h post-injection. Digestion and excretion of 90Y-DTPA-Dx70-SMS was mainly through the hepatobiliary and kidney systems. Increased uptake was seen in the adrenals and pancreas, and it kept almost constant during 24h. Therefore 90Y-DTPA-Dx70-SMS has targeting properties towards somatostatin receptor positive organs and it may become a promising therapeutic agent candidate for somatostatin receptor positive tumors.  
        关键词：Dextran;Somatostatin;90Y;Tumor   
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        发布时间：2021-03-12
      • HAO Kuihong1,2 WANG Huaxiang1 ZHAO Yingchun2 1
        Issue 5, (2007)
        摘要：A new low-noise charge-sensitive micropreamplifier used in portable detecting instrument is designed through analysing the performance of CdZnTe semiconducte detectors and considering the noise character of the charge-sensitive amplifier. At normal temperature, energy resolution of the detecting system with a 3mm×7mm×3mm CdZnTe detector and the charge-sensitive micropreamplifier is 4.38% to the 59.5keV 241Am γ source.  
        关键词：Charge-sensitive amplifier;CdZnTe detector;Noise;Energy resolution   
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        发布时间：2021-03-12
      • CAI Sijing LE Renchang HE Zhijie
        Issue 5, (2007)
        摘要：A gamma-ray spectrometer was developed based on LabVIEW programming technique. The hardware configuration, parameter requirements, software design and performance of the γ spectrometer were described. With a high-speed data-collection card, its data collection was much faster than reading speed of the LabVIEW software. In order to solve the access rate-matching problem, a collecting component with very high operation speed was used. This improves the system’s performance.  
        关键词：γ-ray spectrometer;Multi-channel pulse amplitude analyzer;LabVIEW;Dynamic link library   
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        发布时间：2021-03-12
      • LIU Xingfen WU Haiping LI Yulan LI Qingnuan WANG Lihua
        Issue 5, (2007)
        摘要：A high sensitive colorimetric mercury （II） biosensor based on gold nanoparticles （AuNPs） is reported. Thiolated T-rich oligonucleotides were assembled on the surface of AuNPs, which was used as a probe to recognize Hg（II） specifically. The solution was red when the AuNPs were dispersed in the system without target Hg （II）. How- ever, the solution of AuNPs would change to blue when it probed the Hg （II） due to the formation of aggregates of AuNPs. The formation of the T-Hg2+-T structure would shorten the distance between the AuNPs, resulting in the for- mation of aggregates and the color change from red to blue that can be observed with naked eyes. This mercury （II） sensor is found to be have high sensitivity and selectivity, as it allows a fast （in minutes） identification of 5μmol/L Hg （II） without any detectable perturbation by a spectrum of non-specific metal ions.  
        关键词：Biosensor;Gold nanoparticles;Mercury(II);Colorimetry;Inductively coupled plasma mass spectrometry   
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        发布时间：2021-03-12
      • ZHANG Wenzhong1 ZHANG Xiaomin2 LUO Yisheng2 1
        Issue 5, (2007)
        摘要：Based on a reactor neutron source, we have calculated and analyzed characteristics of boron, lithium fluoride, cadmium and gadolinium as thermal neutron absorbing materials by Monte Carlo (MC) method. General performance of the materials for absorbing thermal neutrons are discussed. Optimum material was selected for establishing an epithermal neutron radiation field.  
        关键词：Nuclear reactor;Neutron;Absorbing material;MC method;Epithermal neutron field   
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        发布时间：2021-03-12
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