最新刊期
      卷 0 ， 期 0 ， 2020
      • HUANG Wanxia1 GE Siqin2 YUAN Qingxi1 ZHU Peiping1 WANG Junyue1 LIU Yijin1 CHEN Bo1 SHU Hang1 HU Tiandou1 WU Ziyu1 1
        Issue 7, (2007)
        摘要：As a technique of X-ray phase contrast imaging,the diffraction enhanced imaging(DEI) attracts much in-terest due to its high resolution and contrast.The top images of DEI were used to study the growth of a complete metamorphic mythimna in the period of pupa.Clear images about the pupa structure were obtained.The entire growth process of the pupa was observed,including the evolvement of part of organs and tissues from larva to imago.  
        关键词：Diffraction enhanced imaging;Synchrotron radiation;Mythimna pupa   
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        发布时间：2021-03-12
      • FANG Chunhui1,3 FANG Yan1,3 JIA Quanjie2,3 WANG Huanhua2,3 JIANG Xiaming2,3 WANG Yuzhu2,3 CHEN Yu2,3 LIN Lianjun1,3 QIN Xufeng1
        Issue 7, (2007)
        摘要：An experimental method is reported in this paper for X-ray measuringement of liquid structure by X-ray reflection of from flat specimen cell with a the five-circle goniometer in of the 4W1C beamline of Beijing Synchro-tron Radiation Facility(BSRF I) was reported in the paper.Taking the scattering measurement of an aqueous solution of sodium sulfate for as an example,construction of liquid cell,scattering geometrical arrangement,sample alignment,and scanning mode were briefly introduced.Corrections of the measured scattering intensity for such as net absorp-tion of beryllium window,air scattering,synchrotron radiation polarization,sample absorption and geometrical factor,etc.were described in detail.Calculation procedures of liquid structural function and radial distribution function,in-cluding removal of Compton scattering and spurious peak,were demonstrated.The result shows that high quality X-ray scattering data can be obtained by the X-ray reflection method.  
        关键词：Synchrotron radiation;Reflection method;X-ray scattering;Sodium sulfate;Liquid structure   
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        发布时间：2021-03-12
      • CAI Quan1,3 ZHANG Junxi2 CHEN Xing1,3 CHEN Zhongjun1 WANG Wei1,3 MO Guang1,3 ZHANG Kunhao1,3 HU Tiandou1,3 WU Zhonghua1,3 ZHANG Lide2 1
        Issue 7, (2007)
        摘要：Cu nanowires with diameter of about 50 nm were electrochemically deposited in anodic alumina mem-brane.An in-situ high-temperature XRD technique was used to measure the crystalline structures.The results demon-strate that these Cu nanowires have a thermal expansion coefficient of about 2.6×10-5 K-1,which is a little larger than the bulk’s one.These polycrystalline Cu nanowires are completely different from the zero-expansion Cu nanowires reported in previous reference.It is concluded that the thermal expansion coefficient is dependent on the crystalline perfection in nanowires.  
          
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        发布时间：2021-03-12
      • SUN Minhua MOU Hongchen WANG Yuxi LI Demin WANG Aiping MA Congxiao CHENG Weidong WANG Dan LIU Jia
        Issue 7, (2007)
        摘要：Structural evolution of olefin during its heating process was observed with SAXS method at Beijing Syn-chrotron Radiation Facility.The mean square fluctuation of electron density increased from 468.5 nm-2 at 22℃ to 2416 nm-2 at 100℃,while the electronic gyration radius decreased from 11.61 nm at 22℃ to 11.16 nm at 100℃.Therefore,the olefin softens as a result of the increased thermal motion of the molecules,rather than the shrinking size of fundamental structural units of olefin.  
        关键词：Small angel X-ray scattering;Paraffin   
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        发布时间：2021-03-12
      • WANG Wei CHEN Xing CAI Quan MO Guang CHEN Zhongjun LI Zhihong ZHANG Kunhao WU Zhonghua 1
        Issue 7, (2007)
        摘要：A program for small-angle X-ray scattering(SAXS) data analysis was written in FORTRAN language based on the raw data format in Beijing Synchrotron Radiation Facility.The first version of this program,SAXS1.0,includes the following functions and characteristics:raw-data pretreatment,background removal,Guinier-plot,Porod-plot,log-log plot,particle-size distribution,comparison between calculated and experimental scattering inten-sities,etc.Some simple particle-shape information can be derived from the parameters obtained with the code.  
        关键词：SAXS;Program;Data analysis;Particle-size distribution;Particle shape   
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        发布时间：2021-03-12
      • WANG Bing1,2 JING Long1 FENG Weiyue1 XING Gengmei1 WANG Meng 1,2 ZHU Motao1,2 OUYANG Hong 1 ZHAO Yuliang1,2 WU Zhonghua3 1
        Issue 7, (2007)
        摘要：The size and shape of ZnO and Fe2O3 nano-particles in 1% sodium carboxy methyl cellulose were meas-ured by small-angle X-ray scattering(SAXS) of synchrotron radiation.Compared with the TEM results,the SAXS results indicated that the ZnO and Fe2O3 nano-particles in 1% sodium carboxy methyl cellulose were agglomerated.However,the size and shape of the agglomerated particles were almost unchanged along with the increase of particle concentration,indicating that the particles in 1% sodium carboxy methyl cellulose were stable.  
        关键词：Small-angle X-ray scattering;Nanometer zinc oxide;Nanometer ferric oxide;Dispersive medium;Size;Morphology   
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        发布时间：2021-03-12
      • WEI Xiye LEI Jiarong YUAN Yonggang CUI Gaoxian ZHAO Lin ZHAO Minzhi
        Issue 7, (2007)
        摘要：Self-shielding factors of LiFTLD are important parameters when the TLDs are used for dosimetry meas-urements of n-γ mixed field.MCNP simulations of the self-shielding factors were carried out for LiFTLDs of different sizes,densities and 6Li contents.And the calculated results were compared with those based on a theoretic formula and Horowitz’s method.Meanwhile,an experiment was designed to verify their dosimetry accuracy.The model and method adopted in MCNP were proved to be reliable.LiFTLDs available at CAEP,of different sizes,shapes and materials,and self-shielding factors of which were not available in the literatures,were simulated based on a reasonable model using MCNP in this paper.The results are of significance for measurements of n-γ mixed field and for studies on the LET effects of TLD.  
        关键词：Self-shielding factor;Neutron fluence;Monte Carlo method;Thermoluminescence dosimeter(TLD)   
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        发布时间：2021-03-12
      • LI Kai WANG Yonggang ZHANG Tao
        Issue 7, (2007)
        摘要：The front-end electronics of fast luminosity monitor system for BEPCⅡ(Beijing Electron-Positron Col-lider,Phase Ⅱ) was designed,constructed and tested.It mainly includes a large dynamic range high speed pre-amplifier,programmable high speed discriminators,anti-coincidence circuit,signal shaping and transferring.The test results show that the front-end electronics satisfies the requirements of 4 ns bunch-by-bunch fast luminosity mon-itor system for BEPCⅡ.  
        关键词：Luminosity;Front-end electronics;BEPCⅡ   
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        发布时间：2021-03-12
      • LI Tianjiang1 LI Zifeng1 GUO Zhenhua2 ZHAO Yanchao2 WANG Changjin1 SHEN Zhonghua3 1
        Issue 7, (2007)
        摘要：For establishing a good log petrophysical model and evaluating productivity of tight sandstone gas reser-voir in Tabamiao area of Ordos basin accurately,NMR porosity data of Section 3 of the wells were compared with the core porosity values for 14 cores.A linear relationship was observed.A comparison between the NMR permeability and core permeability gave similar result.This indicates a linear relationship between the porosity and permeability from NMR log and conventional log.Using the NMR porosity and permeability and conventional log data,accurate conventional log porosity model and permeability model were established.As NMR log avoids the non-parallelism of depths with conventional log and the pore-permeability model established by incontinuous core data causes no error,the new models are more appropriate for the porosity and permeability estimation of the gas formation.  
        关键词：NMR log;Porosity;Permeability;Tight sandstone;Gas reservoir;Conventional log   
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        发布时间：2021-03-12
      • HE Tongqi1,2 HU Wei2 PU Gengqiang1 SUN Guangkui2 SHI Weiguo2 LI Minxi2 ZHANG Yutian2 1
        Issue 7, (2007)
        摘要：Recently,the pollution caused by industrial exhaust gas,especially,the air pollution and acid rain resulting from the sulfur of exhaust gas,is increasingly drawing people’s attention.The flue gas desufurization by electron beam produced by high-power electron accelerator has the characteristics of high efficiency and non-secondary contamination.As one of the most pivotal part of accelerator,the service lifetime of this extraction window directly effects the stable operation of the device.In this paper,a brief review is given to summarize the advantages,material selecting,structure,replacing,maintaining of the extraction window of high-power electron accelerator developed by SINAP.  
        关键词：Flue gas desulfurization;Electron accelerator;Extraction window;Titanium foil   
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        发布时间：2021-03-12
      • XU Shuyan1 LIU Baojie1 LI Qin2 1
        Issue 7, (2007)
        摘要：This article briefly introduces Monte Carlo Methods and their properties.It narrates the Monte Carlo methods with emphasis in their applications to several domains of nuclear technology.Monte Carlo simulation meth-ods and several commonly used computer software to implement them are also introduced.The proposed methods are demonstrated by a real example.  
        关键词：Monte Carlo method;Particle’s translation;Radiation effect;Dose   
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        发布时间：2021-03-12
      • CHEN Libo YUAN Zhibin ZHU Ruisen
        Issue 7, (2007)
        摘要：Patients with progressive metastatic(or recurrent) differentiated thyroid carcinoma that either do not take up radioioidine or are unresponsive to continued radioiodine therapy can be selected for somatostatin-receptor scinti-graphy(SRS) and high-dose peptide receptor radionuclide therapy(PRRT).PRRT with the β-particle-emitting ra-dionuclides yttrium-90(90Y) and lutetium-177(177Lu) gives the best results in terms of objective tumor response.Promising and novel radiolabeled somatostatin analogs used in the diagnosis and treatment of thyroid cancer are also discussed.  
        关键词：Thyroid cancer;Somatostatin;Radiolabeling;Diagnosis;Therapy   
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        发布时间：2021-03-12
      • QIAN Jianjun TIAN Ye
        Issue 7, (2007)
        摘要：To assess the subjective variability in gross tumor volume(GTV) delineation by radiation oncologists,six physicians from Departments of Radiotherapy and Radio-diagnosis were invited to delineate the GTV on sequential CT slices twice with one-month interval.The CT images were from 12 cancer patients with different tumor location in their body.The variability of GTV volume value and its difference from inter-speciality and inter-interval were calculated.A high variability of GTV volume was found,the ratio of the largest to the smallest volume was less than 2 in 9 patients,while it was larger than 2 in all the others.As for the change range of GTV volume compared with its mean value in each patient,there were 16% volume values larger than ±25%.With the well-controlled objective in-fluences,there were statistical differences of GTV volume of 3 patients in the inter-speciality variation.The variation within the radiation oncologist was larger than that within the radio-diagnosticians.A large subjective variability in GTV delineation was demonstrated.A better training and cooperation of radiation oncologist,and standardization of the QA and QC approach with guidelines will result in a reduction in this variation of radiotherapy planning.  
        关键词：Radiotherapy;Gross target volume(GTV);Delineation;Variability;Subjectivity   
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        发布时间：2021-03-12
      • GUO Jianhua LIU Shubin FENG Changqing LI Hao AN Qi
        Issue 7, (2007)
        摘要：The TOF FEE of BESⅢ consists of 448 channels,which imply a great challenge in their test and calibra-tion.In this paper,a test system based on the idea of virtual instrument for TOF FEE is described in detail.Some test results from the system are given.  
        关键词：TOF FEE(Time-of-Flight Front End Electronic);Virtual instrument;VISA(Virtual instrument software architecture);SCPI(Standard command for programmable instruments);VME(Versa Module Eurocard)   
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        发布时间：2021-03-12
      • SHI Dongsheng DI Yuming ZHOU Chunlin
        Issue 7, (2007)
        摘要：In applying neural network to identification of gamma spectra back propagation(BP) algorithm is usually trapped to a local optimum and has a low speed of convergence.,whereas particle swarm optimization(PSO) is ad-vantageous in terms of globe optimal searching.In,this paper,we propose a new algorithm for neural network train-ing,i.e.combined BP and PSO optimization,or PSO-BP algorithm.Practical example shows that the new algorithm can overcome shortcomings of BP algorithm and the neural network trained by it has a high ability of generalization with identification result of 100% correctness.It can be used effectively and reliably to identify gamma spectra.  
        关键词：Neural network;BP algorithm;PSO;Gamma spectrum identification   
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        发布时间：2021-03-12
      • DU Junwei WANG Yonggang DAI Xuelong
        Issue 7, (2007)
        摘要：By simulating the detection procedure of 511 keV γ photons in the scintillating detector which consists of a bulk NaI(Tl) scintillation crystal,a glass light guide and a PMT array,a novel neural network estimator is applied to calculate the incidence point of γ photons corresponding to the output scintillating light from PMT array.Compared with traditional Anger algorithm,neural network can conquer or reduce the interaction-depth effect and edge effect,and give high spatial resolution.Meanwhile from the point of view of practical application,relationship between the generalization ability of neural network and the incidence angle is also studied in the paper.  
        关键词：PET;FWHM;Neural network;Scintillation crystal;Generalization ability   
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        发布时间：2021-03-12
      • ZHANG Jing PENG Shiwen XU Guoliang
        Issue 7, (2007)
        摘要：Based on theoretical investigation of critical heat flux of annular flow in limiting quality regime(LQR),the Whalley model is solved numerically and the adaptability of the model in LQR is analyzed.Furthermore,a physi-cal model of critical heat flux used to the round flow tube is developed and compared with some other major physical models.Prediction results show that the physical model works very well because of its relative high accuracy.  
        关键词：Round flow tube;Critical heat flux;Annular flow;Limiting quality regime   
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        发布时间：2021-03-12
      • ZHANG Mengjiao QI Yuji
        Issue 7, (2007)
        摘要：To develop high resolution gamma camera,a novel readout method is adopted.The detector of the gamma camera is based on CsI(Na) scintillation crystal array coupling with position-sensitive photomultiplier(PSPMT).The novel readout scheme utilizes the truncated center-of-gravity(TCOG) method,which hybridizes the conventional re-sistive readout and the individual analogue readout.The TCOG design was tested on a readout circuit board made by ourselves.As a result,the gamma camera could achieve an intrinsic spatial-resolution of 1 mm.The field-of-view(FOV) was also improved to cover the active area of the detector.In conclusion,the TCOG method is an effective approach to developing high-resolution compact gamma camera.This method can also be used in the newly high-integrated multi-anode PSPMT.  
        关键词：Gamma camera;Position-sensitive photomultiplier(PSPMT);Truncated COG   
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        发布时间：2021-03-12
      • WU Huailong HAO Fanhua TANG Yuanming
        Issue 7, (2007)
        摘要：The release rate of krypton and xenon is an important index in isotope production by nuclear reactors.Measurement data of 135Xe,whose parent nuclide’s half-life is relatively long,are analyzed.A release model accord-ing with the fact is obtained by the principle that the fission quantity should be consistent in different sampling time.A valuable conclusion about the fission gases release problem is presented.  
        关键词：Fission products;135Xe;Release rate   
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        发布时间：2021-03-12
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