最新刊期
      卷 0 ， 期 0 ， 2020
      • JI Ruimin1,2 TIAN Shunqiang1,2 HOU Jie1,2 CHEN Guangling1,2 LIU Guimin1 1
        Issue 5, (2008)
        摘要：hanghai Synchrotron Radiation Facility(SSRF) is a medium energy third generation light source under construction.For providing high quality radiations to the users,it is a must to have high quality beam,which will be affected by RF noise in the storage.In this paper,effects of the RF phase noise and amplitude noise,and increase of the bunch length,on the beam energy spread of SSRF storage ring are investigated based on the DKW theory.The micro-focus radiation flux and flux density,which is delivered from insertion device U27,are particularly calculated with SPECTRUM.The results reveal that RF phase noise conduct greater influence on radiation compared with RF amplitude noise and the higher mode of radiation suffers more.  
        关键词：SSRF storage ring;RF noise;DKW theory;Bunch length;Energy spread;Photon flux   
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        发布时间：2021-03-12
      • DAI Xing1,2 YE Kairong1 CHEN Jie1 1
        Issue 5, (2008)
        摘要：Beam size measurement of an accelerator is very important to parameter optimization of the system’s operation.The Shanghai Synchrotron Radiation Facility(SSRF) adopts synchrotron light measurement to perform real-time monitoring of the beam size without let or hindrance.In this paper,we introduce the light measurement system,including the light path control,data acquisition and data processing,in which LabVIEW is used to treat data from double slits interferometer.Precision of the beam size measurement can be at μm level.  
        关键词：Synchrotron radiation;Interferometer;Data processing   
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        发布时间：2021-03-12
      • QI Rong1,2 MAO Yong2 CHEN Ximeng1 1
        Issue 5, (2008)
        摘要：Gamma ray spectra were measured by a Φ8"×4"NaI(Tl) detector with different radioisotope sources to test a full-energy peak fitting function,which is a Gaussian plus a high-energy tail correction and a low-energy cor-rection.The fitting function can properly describe a γ-ray peak with nine parameters,which are automatically opti-mized.The parameters for 57Co,137Cs,60Co and 40K and the corresponding analysis were given.Considering requests on analysis time and credibility of the γ spectra by a NaI whole body counter,the function was simplified on the basis of experiment accuracy.The high-energy tail correction term can be ignored due to lower contribution,the peak ad-dress and FWHM of the Gaussian,and the low-energy tail correction term,could be bonded together to reduce the freedom to four parameters in the fitting.The results show that the Analytic Improved Figure-of-Merit(AIFOM) of the fitting for γ-ray peaks of 57Co,137Cs,60Co and 40K measured by the NaI detector are less than 0.01%.  
        关键词：Fitting function;Gaussian function;Low-energy tail correction term;Full-energy peak fitting   
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        发布时间：2021-03-12
      • SUN Yinbao 1,2 XIE Yaning 1 1
        Issue 5, (2008)
        摘要：When virtual photons produced by charged particles passes crystal and are diffracted by crystal lattice in the mode of Bragg or Laue geometry,they can form a kind of X-ray radiation named parametric X-ray radia-tion(PXR),PXR has a serious of characters: linearly polarized,quasi monochromatic,smoothly tunable,narrow width of energy,high efficiency of photo/electron conversion.Electrons in MeV and GeV energies can be used to produce PXR.There are also some aspects of potential application about PXR.  
        关键词：Parametric X-ray radiation(PXR);Quasi monochromatic;X-ray source   
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        发布时间：2021-03-12
      • QI Xuehong1,2 XU Mingliang1 ZHAN Furu1 1
        Issue 5, (2008)
        摘要：A circuit based on generating voltmeter(GVM) has been developed to improve terminal voltage stability of an electrostatic accelerator for single ion microbeam applications.The quality of the microbeams is thus improved in stability and positioning precision.A simplified model is set up to calculate the relationship between the energy instability and the beam spot size.As a result,beam radius is reduced about 10% and the steady running time exceeds six hours.  
        关键词：Single ion microbeam;Electrostatic accelerator;Energy stability   
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        发布时间：2021-03-12
      • ZENG Xinmiao ZHOU Peng XU Ziyan QIN Peizhong HU Xiang ZHENG Jinmei WANG Binglin
        Issue 5, (2008)
        摘要：The MCNP code was used to simulate neutron transmission and reflection from neutron sources of 14 MeV,5 MeV and 252Cf with a shielding body of different sizes in a room of different structures.The results show that both the size and the structure of the shielding body have quite big influence on the transmission of the neutron,and that the room structure and pit have quite big influence on the background reflection.The study provides a valuable reference for designing a neutron source room for experiment with a neutron source.  
        关键词：Neutron shielding body;Source room structure;Neutron transmission;Background;MCNP code   
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        发布时间：2021-03-12
      • WANG Gaili1,2 YU Xuefeng2 REN Diyuan2 ZHENG Yuzhan1,2 SUN Jing3 WEN Lin3 1
        Issue 5, (2008)
        摘要：By irradiating CMOS 4000 and 54HC series gate circuits under different biases,characteristics of total dose radiation responses of the devices were compared and mechanisms of the different radiation effects to the two kinds of circuits were investigated.The radiation tolerance testing methods and evaluating standards of the 54HC devices are discussed.  
        关键词：CMOS;Total-dose-radiation;Leakage-current;Mechanism   
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        发布时间：2021-03-12
      • ZHANG Shaohua1,2 LEI Jiarong2 ZHOU Rongsheng1 YUAN Yonggang2 WEI Xiye2 1
        Issue 5, (2008)
        摘要：A simple model has benn developed to describe working principle of a silicon photodiode using thickness of the passivation and depletion layers as parameters.The AXUV-100 silicon photodiode was calibrated with 137Cs 661 keV γ-ray.The calibrated curve agrees well with the abroad calibrated curve.A formula can be applied to calculate fluence of low-energy X-ray photons impinging on this kind of silicon photodiode.  
        关键词：Silicon photodiode;Depletion layer;Passivation layer;Calibration techniques;Photon fluence   
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        发布时间：2021-03-12
      • ZHU Cuiying ZHOU Huan HAN Yuan LING Liqun HUANG Gang
        Issue 5, (2008)
        摘要：The aim of this study was to find and establish the serum marker which can reflect the degree of intrahepatic lipid infiltration in Type 2 diabetes patients and assess the therapeutic effect.It helps us to observe the improvement of intrahepatic lipid deposit under controlled serum glucose metabolism.Twenty-three Type 2 diabetes patients with obvious intrahepatic lipid infiltration diagnosed by CT scan were divided into two groups,one group took rosiglitazone orally(male: female 5:6),and the combined treatment group took rosiglitazone and metformin simultaneously(male: female 6:6),in daily therapeutic dose of 4 mg rosiglitazone and 2 g metformin for 24 weeks.Before and after treatment,we measured fasting serum glucose,glycated hemoglobin(GHb),insulin,insulin resistant index,plasma adiponectin,leptin,tumor necrotic factor α(TNF-α),ferrtin respectively.After the treatment,fasting serum glucose and GHb decreased obvious,especially the combined treatment group.Intrahepatic lipid content percent decreased,too,in both groups(the rosiglitazone group: 43.3±25.8 vs 29.1±18.7,P<0.01,the combined group: 43.4±21.8 vs 22.0±16.7,P<0.01).Plasma adiponectin and TNF-α had correlation to intrahepatic lipid contend percent change.Plasma adiponectin and TNF-α was obviously improved in the rosiglitazone group and the combined treatment group(Adiponectin: 11.96±7.3 vs 20.61±12.0 ng/mL,12.76±6.7 vs 25.81±12.8 ng/mL;TNFα: 6.92±2.5 vs 5.89±1.9 pg/mL,6.81±2.14 vs 5.45±2.0 pg/mL;P<0.01).In addition,serum ferrtin concentration decreased obviously,especially the combined treatment group(rosiglitazone group: 345±116 vs 288±71ng/mL,P<0.05,combined treatment group: 362±194 vs 258±109 ng/mL,P<0.01).It can be concluded that 1) rosiglitazone and metformin controls serum glucose metabolism and improves intrahepatic lipid infiltration by especially the combined treatment,2) plasma adiponectic and TNF-α are effective markers to reflect intrahepatic lipid infiltration,and they correlate to degree of intrahepatic lipid infiltration and achieve therapeutic effect,and 3) serum ferrtin reflects degree of intrahepatic lipid infiltration.The method is conveniently applicable,for curing the disease and monitoring the degree of intrahepatic lipid infiltration.  
        关键词：Type 2 diabetes;NAFLD;Adiponectin;TNF-α;Ferrtin   
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        发布时间：2021-03-12
      • YANG Min PAN Donghui XU Yuping WANG Songpei TANG Jie LIU Chunyi LUO Shineng
        Issue 5, (2008)
        摘要：In this paper,we report preparation and biodistribution in mice of 18F-Fallypride,a dopamine D2 receptor PET imaging agent.18F-Fallypride was prepared by nucleophilic fluorination of(s)-N-[(1-allyl-2-pyrrolidinyl)methyl]-5-(3-tolunesulfonyloxypropyl)-2,3-dimethoxybenzamide with K18F/K222(Kryptofix) in a chemical process control unit.Purity and stability of the 18F-Fallypride were checked by HPLC and TLC,the dynamic distribution in brain and critical organs of ICR mice were studied.The radiolabelling yield of 18F-Fallypride was 40.75% and the radiochemistry purity was over 97%.The whole process(including synthesis,purification and analysis) took only 40 minutes.After 4 hours in room temperature,the radiochemical purity of 18F-Fallypride was still over 95%.The striatum uptake was good,the striatum/cerebellum ratio reached 14.27 at 120 min.Among the critical organs,kidney had the first and the highest uptake(9.91±1.24 %ID.g-1).All organs had quick clearance(T1/2<1 h).The radioactivity in bone increased with time.The results show that 18F-Fallypride has a high striatum uptake and a high striatum/ cerebellum ratio.18F-Fallypride is a good dopamine D2 receptor agent.The autosynthesis method of 18F-Fallypride is simple and fast with high labeling yield and high radiochemical purity.This method is fit for clinic use.  
        关键词：Dopamine D2 receptor;18F-Fallypride;Synthesis;Biodistribution   
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        发布时间：2021-03-12
      • TANG Ganghua1 TANG Xiaolan2 WANG Mingfang1 LI Baoyuan1 LIANG Mingquan1 WANG Quanshi1 1
        Issue 5, (2008)
        摘要：A simple and rapid automated synthetic technology of 18F-fluoroacetate(18F-FAC) is described in this pa-per.Automated synthesis of 18F-FAC was performed by 18F-fluorination of benzyl-2-bromoacetate as a precursor,on-column hydrolysis and Sep-Paks purification using a modifying commercial TRACERlab FXFN synthesizer.A high and reproducible radiochemical yield of above 60%(decay uncorrected) was obtained within the whole synthesis time less than 20 min.The radiochemical purity of 18F-FAC was >95%.The new,simple,and rapid on-column hydrolysis procedure should adaptable to the fully automated synthesis of 18F-FAC at commercial FDG synthesis module.  
        关键词：18F-fluoroacetate;Tumor imaging agent;On-column hydrolysis;Automated synthesis   
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        发布时间：2021-03-12
      • CHEN Bingzhou1,2 ZOU Lian2 HOU Qing2 1
        Issue 5, (2008)
        摘要：Considering combined effect of phton scattering in phantom and constraint conditions for organ(s) at risk,it is difficult to optimize the intensity of beam profiles and weight of segments or conformal fields during the process of radiotherapy planning design.In this paper,a two-step method is proposed.First,the prescription dose of PTV,constraint conditions of OAR and dose matrix without considering the scattering in phantom are used to optimize the dose distribution which is called the voxel-by-voxel-based objective dose.With the new objective dose and consider-ing the scattering,the intensity or the weight could be well optimized.The second step is an optimization process without constraint conditions and the optimization can be finished rapidly.Because the new objective dose satisfies the constraint condition in Step 1 and the dose matrix is calculated by accurately dose calculation algorithm in Step 2,the results are satisfying and credible,as verified by applying the method to a typical example.  
        关键词：Objective dose;Radiotherapy;Scatter dose;Constraint condition;Voxel by voxel   
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        发布时间：2021-03-12
      • KE Xinhua1,2 LU Songlin1 XU Ruinian1 XU Shenghui1,2 LI Rui1 SHEN Tianjian1 1
        Issue 5, (2008)
        摘要：Analog-to-digital converter is an important components of signal processing systems.With improved speed and resolution of ADCs,how to test the dynamic and static performance becomes critical to ADC applications.In this paper,we present a low cost high reliability computer-aided method.It can be realized without standard input signal generator.The ENOB and INL of high-resolution ADCs were tested.This method has been verified on several kinds of A/D converter cards.  
        关键词：High-resolution ADC;DSP;ENOB;INL   
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        发布时间：2021-03-12
      • HUANG Shun1,2 ZHAO Xiuliang1 ZHAO Yanhui3 XIE Juying1 YU Hong1 ZHANG Meiqin1 1
        Issue 5, (2008)
        摘要：A sixteen-channel scaler was designed with a C8051F020 microcontroller unit(MCU) and INTEL 8254-2 timer-counter chips.Software controlling techniques were used to increase the counting capacity up to 2.8×1014 by using software counters,to correct errors caused by frequency changes of the crystal oscillator by adjusting software timer to improve the timing accuracy,and to avoid the potential interference by designing digital filters.In addition,the maximal counting rate reached 1×107 s-1.  
        关键词：INTEL8254-2;C8051F020;Counting capacity;Maximal counting rate;Software filter   
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        发布时间：2021-03-12
      • FU Sihong WEI Yongbo JIANG Dazhen
        Issue 5, (2008)
        摘要：This paper presents the application of virtual instrument technology on an ion mobility spectrometer(IMS).By designing the data acquisition and processing system of IMS on LabVIEW platform,the ability of signal processing and real time measurement in practice has been improved.  
        关键词：LabVIEW;Ion mobility spectrometer;Curve fitting   
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        发布时间：2021-03-12
      • YANG Lei LI Dongcang QI Zhong ZHANG Wenhui
        Issue 5, (2008)
        摘要：An X-ray generator works on high-voltage and low-voltage power supplies.In this paper,a continual adjustable DC high voltage power supply and filament current source were design based on switching power-supply technology and resonant inverter technology.Microcontroller was employed for the realization of the digital control scheme.Test results show that the X-ray source satisfies the requirements of security inspection equipment.  
        关键词：Microcontroller;Digital control;X-ray;Power supply   
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        发布时间：2021-03-12
      • LI Xinxi HUANG Chaoqiang WANG Yan CHEN Bo
        Issue 5, (2008)
        摘要：Double disk chopper is widely used in neutron scattering spectrometers,its main function is to cut the se-quential neutrons into neutron pulses.Aiming at a time of flight neutron reflectometer under construction,we intro-duce the design of double disk chopper in detail.The resolution is optimized through theoretical calculation,and the neutron flux after the chopper is estimated using the McStas codes.The results can be a reference for double disk chopper design and production.  
        关键词：Chopper;Design;Optimization   
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        发布时间：2021-03-12
      • WENG Wenqing1 WANG Dezhong1 ZHANG Yong2 LIU Cheng1 YANG Yongliang21
        Issue 5, (2008)
        摘要：In this paper, the algorithm for calibrating radionuclide activity of waste barrels from a nuclear power plant is studied. A simulations to validate the algorithm was done on a model of 1:2 ratio to an actual waste barrel at a nuclear power plant. The results indicate that the image reconstruction errors are smaller than other algorithms.Further more, this method, with strong practicability, can well meet the requirements of TGS device.  
        关键词：Tomographic Gamma Scanning;Linear attenuation coefficient;Monte-carlo;Transmission image reconstruction   
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        发布时间：2021-03-12
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