最新刊期
      卷 0 ， 期 0 ， 2020
      • HUANG Guoqing CHEN Jie CHEN Zhichu LENG Yongbin YE Kairong
        Vol. 34, Issue 9, (2011)
        摘要：Beam emittance is an important parameter for a third-generation synchrotron light source.In this paper,we report design of the control system of the X-ray pinhole camera to measure emittance of SSRF.The PXI-7344 controls the attenuator motion,the PXI-8252 collects the X-ray image by IEEE1394,and the RS232 controls four-dimensional motion of the pinhole and two-dimensional motion of the camera.The software was developed on LabVIEW platform to communicate with the accelerator control system via EPICS Shared Memory IOC core interface.Since August 2009,the X-ray pinhole camera system has been working reliably in measuring the beam emittance of just 3.9 nm.rad.  
        关键词：SSRF;X-ray pinhole camera;EPICS;LabVIEW   
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        发布时间：2021-03-05
      • ZHANG Wenrui CHEN Liang JIANG Shiping YAN Jingwen XU Songxiu
        Vol. 34, Issue 9, (2011)
        摘要：We transformed the transmission optical system of soft X-ray microscopy beam line,and established a platform suitable for studies on soft X-ray radiation damages to single cell.The X-ray energy of OK absorption edge was selected to scan Hela cells single by single.Single cell gel electrophoresis was used to evaluate the irradiation-induced damage effects.The results show that the radiation damage effect has dependence to the radiation dose.Thus,we provide a useful exploration for further works on radiation damage to single cells by soft X-rays.  
        关键词：Soft X-ray;Single cell;Radiation effects   
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        发布时间：2021-03-05
      • HAN Fei1,2 YIN Gongming1 LIU Chunru1 GAO Lu1 1
        Vol. 34, Issue 9, (2011)
        摘要：In this paper,we give a review on combined ESR/U-series methods for dating tooth fossil from Middle-Early Pleistocene sites.This approach allows estimating the history of uranium uptake in each dental tissue by using a one-parameter(p-value) diffusion equation,being more accurate than the conventional methods where the mode of uranium uptake is predetermined.Conventional ESR dating postulates two models: an early uptake(EU) model which assumes that uranium was incorporated shortly after the sample burial,and a linear uptake(LU) model where uranium is supposed to have been incorporated at a constant rate since the time of burial.The previous works stated that correct ESR age of a sample lies always somewhere between the EU and LU uptake ages.In recent years,combined ESR/U-series methods are becoming known as a unique approach for dating old fossils directly,and were applied on several archaeological sites in the world.The archaeologists and dating specialists in China are called on to make a good joint effort and collaboration in installing and developing the combined ESR/U-series dating methods and to carry out better studies on chronology of Middle-Early Pleistocene sites.  
        关键词：ESR dating;U-series dating;Tooth fossil;Middle-Early Pleistocene archaeological sites   
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        发布时间：2021-03-05
      • ZHOU Yu XIE Zhenfei GENG Yanyan ZENG Xianyin
        Vol. 34, Issue 9, (2011)
        摘要：In this work,we investigated the protective effect of gingerol on anti-oxidative function and hematopoietic system of 60Co γ-ray irradiated mice.Twenty-four healthy female Kunming mice were randomly divided into(I) control,(Ⅱ) gingerol,(Ⅲ) irradiation and(IV) gingerol + irradiation groups.Groups Ⅱ and IV were given gingerol intragastrically for five days.Groups Ⅲ and IV were irradiated to 5 Gy by 60Co γ-rays on the 6th day.Blood samples,livers and thigh bones were collected and measured in 48 hours.It was found that the DNA coefficient of bone marrow,T-SOD activities,RBC,PLT,LYM and WBC numbers in Group Ⅱ mice were higher than those in the control group,and T-AOC activities(p<0.05) in the gingerol group increased significantly compared with the control group.The RBC,PLT,LYM and WBC numbers,T-AOC activities(p<0.05),DNA coefficient of bone marrow and T-SOD activities(p<0.01) in the irradiation group reduced compared with the control group.Compared with irradiation group,T-AOC activities(p<0.05),T-SOD activities,WBC numbers and DNA coefficient of bone marrow(p<0.01) increased significantly in the gingerol + irradiation group.The ratio of Group IV/Group III is higher than that of Group Ⅱ/Group I.The results demonstrated that gingerol has the protective effect on anti-oxidative function and hematopoietic system of mice irradiated by 60Co γ-rays.  
        关键词：60Co γ-rays;Gingerol;Antioxidant;Hematopoietic system;Protection   
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        发布时间：2021-03-05
      • LI Fei GE Liangquan ZENG Guoqiang GU Yi XIAO Ming
        Vol. 34, Issue 9, (2011)
        摘要：A software is being developed to allow convenient and accurate determination of the X-ray fluorescence(XRF) spectrum.It uses the features of Gaussian to calculate an ideal spectrum by simulating digital pulse and making the D/D conversion.Peak shapes of the simulated XRF spectrum and measured spectrum are compared.By zooming two images and making them superposition,the relative maximum and minimum changes in the peak position are calculated.The smaller the change is,the higher the instrument accuracy is.  
        关键词：Gaussian function;Digital pulse simulation;D/D conversion   
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        发布时间：2021-03-05
      • HU Chunming YU Chaoju TONG Jianfei
        Vol. 34, Issue 9, (2011)
        摘要：The construction of a reactor cold neutron source(CNS) will be completed in the near future.To evaluate performance of the CNS,a neutronics calculation using MCNP4C code has been carried out.The results show that the average neutron flux in the moderator is 6.69×1013/cm2.s,and the cold neutron gain factors corresponding to 4- and 6- wavelengths are 16 and 32,respectively.The results also indicate that different ratios of ortho-H2/para-H2 have an obvious impact on cold neutron spectrum in the moderator,but within 3 K of the moderator temperature changes,the spectrum varies slightly.  
        关键词：Reactor;CNS;Neutronics;MCNP   
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        发布时间：2021-03-05
      • WU Xue1,3 LU Wu1,2 WANG Yiyuan1,3 XU Jialing1,4 ZHANG Leqing1,3 LU Jian1,3 YU Xin1,3 HU Tianle1
        Vol. 34, Issue 9, (2011)
        摘要：Radiation effects and room-temperature annealing behaviors of BiCMOS ADC(AD678) irradiated by 60Co γ-rays at dose rate of 0.1 and 2×10–4 Gy/s,respectively,are investigated in this paper.The results show that the device’s responses in the sensitive parameters to the dose rates differ distinctly.Big differences occur in radiation effects between analog power supplying current and digital power supplying current.The parameters DNL,INL and Misscode are more sensitive to low dose rate,exhibiting enhanced-low-dose-rate-sensitivity.The damage mechanism of this special response was discussed combining the process and space charge model.  
        关键词：BiCMOS;ADC;Dose-rate;60Co γ radiation   
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        发布时间：2021-03-05
      • LIU Weixin XUAN Ming WANG Kunshu WU Qinzhi
        Vol. 34, Issue 9, (2011)
        摘要：Ionizing radiation effects of typical DC/DC converters are studied in this paper.The relationships between output voltage and irradiation dose under test conditions of output load and input voltage are discussed.The results show that the output voltage decreased with increasing the output load,and the input voltage has less effect on the output voltage.  
        关键词：DC/DC converters;Ionizing radiation effects;Output load;Input voltage   
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        发布时间：2021-03-05
      • LAI Wanchang1 LIU Yanfang1 TANG Lili1 ZHANG Jiangyun2 1
        Vol. 34, Issue 9, (2011)
        摘要：G(E) function is a software method by adjusting energy response of dosimetry instrument to obtain the dose rate.In this paper,we use U,Th,K,60Co and 137Cs models,and U/Th/K mixed model,to obtain the standard spectrum,and then the G(E) function by least-square method.Comparisons of the dose rate results obtained by different methods,the G(E) function method is much better than the Baker formula method.Using the data from stand model and field measurements,analytical error of the G(E) function method is less than 10%.  
        关键词：G(E) function method;Dose rate;Least-square method   
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        发布时间：2021-03-05
      • CHEN Jinsong YANG Hao YANG Benjun ZHANG Mingli WANG Linxian
        Vol. 34, Issue 9, (2011)
        摘要：Detection efficiency of HPGe γ spectrometer is an important performance and has a greater impact on radioactivity measurement results of soil samples.By measuring γ-rays from 210Pb(46.5 keV),214Pb(351.9 keV),7Be(477.6 keV) and 137Cs(661.7 keV) in soil samples of 15–95 mm in thickness(solid angles of ~100°– ~60°),the relationship were investigated between the sample thickness and the γ-ray counts obtained by efficiency calibration or comparative measurements.The results showed that the detection efficiency decreases with increasing sample thicknesses,with the largest ratio(3.5) of maximum/minimum detection efficiency at 46.6 keV and the smallest(2.2) at 661.7 keV.The detection efficiency decrease at low energies was in a logarithm way,while at high energies the detection efficiency decreased linearly.  
        关键词：HPGe γ spectrometer;Detection efficiency;Sample thickness   
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        发布时间：2021-03-05
      • DOU Haifeng LI Rundong LENG Jun YUAN Shu TANG Fengping
        Vol. 34, Issue 9, (2011)
        摘要：In neutron depth profiling,the recorded ions have energy spreads as they travel through the sample material,hence the changes in their spectra.Based on the SRIM codes,we simulated the energy-spread distributions of the four product ions,namely 0.839 and 1.013 MeV Li+ ions,and 472 and 1.776 MeV α particles,in the 10B(n,α)7Li reaction.The fitted functions obtained were used to evaluate the energy spread with Gaussian function.  
        关键词：Spread of energies;Neutron depth profiling;SRIM code;Fitted functions   
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        发布时间：2021-03-05
      • HU Dan1 JIA Huaimao2 WANG Shilian2 YANG Bin1 YANG Weigeng1 LI Qi2 ZHAO Yungang2 FAN Yuanqing2 CHEN Zhanying2 CHANG Yinzhong2 LIU Shujiang2 ZHANG Xinjun2 WANG Jun2 1
        Vol. 34, Issue 9, (2011)
        摘要：In this article,the structure and basic functions of SAUNA noble gas xenon mobile sampling system are introduced.The sampling capability of this system is about 2.2 mL per day,as a result from a 684-h operation.The system can be transported to designated locations conveniently to collect xenon sample for routine or emergency environment monitoring.  
        关键词：Noble gas Xenon;Mobile sampling;Performance test;Xenon volume   
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        发布时间：2021-03-05
      • LI Jing SUN Da ZHAO Chunlei ZHANG Hong
        Vol. 34, Issue 9, (2011)
        摘要：In this work,radiochemical yield of 18F-FDG on a CYRIS HM-12 cyclotron with an F100 synthetic system was investigated by bombarding the 18O target for 15 to 60 minutes.The yield of 18F ion after bombardments of 15–60 min ranged from 21.4 to 71.0 GBq,and the radiochemical yields of 18F-FDG ranged from 48% to 51%.Also,failures the 18F-FDG synthesis were analyzed.Piping block and leak of the synthetic system were of the biggest occurrence.To ensure successful synthesis of 18F-FDG,routine maintenance,test and timely spares replacement are crucial.  
        关键词：18F-FDG;Influential factors;Trouble analysis   
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        发布时间：2021-03-05
      • GU Wenchao1,2 LIU Jian1 SONG Jiong1 1
        Vol. 34, Issue 9, (2011)
        摘要：Abstact In this work,quality control data of a SPECT in 2003–2010 were analyzed by t test.According to the NEMA standard for uniformity,the center of rotation,bar phantom,Jaszczak phantom and the Hoffman phantom were measured in the QC.Compared with the 2003 data,no significant difference was found in the UFOV intrinsic integral uniformity and center of rotation,but the CFOV intrinsic integral uniformity has been worsening since 2007(p<0.05),indicating the performance decrease with equipment age.By the QC measurements,we were able to ensure image quality and diagnostic accuracy of the SPECT.  
        关键词：Restrospective analysis;Quality control;Dual-detector   
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        发布时间：2021-03-05
      • LI Junjie JIANG Yong ZHENG Chun
        Vol. 34, Issue 9, (2011)
        摘要：The detector design and electronics system of a 3He semiconductor sandwich spectroscopy is reported in this paper.The thermal neutron test is conducted and neutron spectra in 0.1–1.3 MeV in the critical assembly are measured.The results indicate that data of 0.3–1.3 MeV neutrons are consistent with the 6Li spectroscopy.So the feasibility to measure leakage neutron spectra in the critical assembly using the 3He spectrometer is proved.  
        关键词：Neutron spectrum;Sandwich spectroscopy;Coincidence method;Fast neutron critical assembly   
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        发布时间：2021-03-05
      • LIU Huifang LI Rui GUO Chunlong
        Vol. 34, Issue 9, (2011)
        摘要：A new power development program has been proposed in this paper.The pulse width is adjustable from 0.45 μs to 8.5 μs,and amplitude from 100 V to 300 V,while the pulse rise time is less than 30 ns.The results show that this new power supply has high stability and simplicity.  
        关键词：Pulse power;Width;Amplitude   
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        发布时间：2021-03-05
      • ZHANG Yu1,3 ZHU Ying2 LI Qingnuan2 CHEN Wen1 HAN Bo1 LI Wenxin2 HUANG Qing2 1
        Vol. 34, Issue 9, (2011)
        摘要：With their increased production,application,and emissions to environment,adverse effects of carbon nanotubes(CNTs) on environment and human health have attracted wide attention.However,much of the research effort has been focused on biological effects of CNTs alone.Due to their high adsorption ability,CNTs are easy to adsorb various toxic metal ions in environment and form CNT-metal ions complex.Biological effects of the complex differ from the individual effect of CNTs or ions,being far from a simple pile-up effect of CNTs and ions.In this paper,we give a review on metal ions adsorption on CNTs,the affecting factors,and environmental toxicology of CNT-metal ions complex.We also point out that radionuclide tracer techniques and synchrotron radiation techniques can play important roles in studies on interactions of metal ions with CNTs and the biological effects on environmental toxicology.  
        关键词：Metal ions;Carbon nanotubes;Adsorption;Environmental toxicology;Nuclear analytical techniques   
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        发布时间：2021-03-05
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