最新刊期
      卷 0 ， 期 0 ， 2020
      • DU Enpeng1 ZHENG Yongnan1 ZHOU Dongmei1 ZUO Yi1 YUAN Daqing1 WANG Pingsheng1 DUAN Xiao1 SHI Haisong1 WANG Jianbo2 LI Fashen2 ZHU Shengyun1 1
        Issue 6, (2005)
        摘要：The quadrupole interactions have been investigated in the nano-and crystalline LaFeO3 perovskites by TDPAC. The TDPAC probe nuclei 140La-140Ce were produced through the nuclear reaction 139La(n.γ)140La at the heavy water experimental reactor in CIAE. One electric quadrupole interaction was detected for each material, which is assigned to the La site. The quadrupole interaction frequencies of 687.4Mrad/s, 698.3Mrad/s and 742.9Mrad/s with a distribution coefficient of 0.014, 0.009 and 0.001 were observed at room temperature for the 20 nm and 40 nm nano-LaFeO3 and crystalline LaFeO3, respectively. The fitting yielded the EFG asymmetry parameter η = 0, which indicates that the principal axes of the EFG are aligned with the crystallographic axes. The experimental results show that the structure of crystalline LaFeO3 is rhombohedral, the structure change towards the orthorhombic takes place from crystalline LaFeO3 to nano- LaFeO3, and the smaller the nano-grain size, the larger the change. Since frequency distribution is caused by the perturbance of neighboring atoms, the distribution coefficient increases with the decrease of the nano-grain size.  
        关键词：TDPAC;Quadrupole interaction;LaFeO3 nano-material   
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        发布时间：2021-03-12
      • LIAN Qi ZHANG Jiamei BAI Tao SHI Quanlin JIN Yuren LI Dongmei ZHANG Xiaolin
        Issue 6, (2005)
        摘要：Nine “single energy” gamma standard solutions are used to calibrate the peak and total efficiencies. True coincidence summing(TCS) corrections in γ spectrum analysis of 60Co、152Eu and 154Eu in cylindrical volume soil samples measured on the top of a HPGe detector with 100% relative efficiency have been studied. The experimental TCS correction factors have been measured by comparing the calibrated efficiency function after correction for self absorption and the efficiencies measured by using standard soil sources, which are 1.10 and 1.14, respectively, for 60Co 1173 and 1332 keV γ-rays. TCS correction factors have also been calculated by using efficiency functions and decay schemes,which are 1.10 and 1.11, respectively, for 60Co 1173 and 1332 keV γ-rays. A relatively strong sample has been chosen to be measured on and far away from the detector surface, and the 137Cs 661 keV peak has been used as a transition to get the TCS correction factors, which agree satisfactorily with those derived by other methods.  
        关键词：γ-rays;Cascade transition;True coincidence summing correction;60Co;152Eu;154Eu   
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        发布时间：2021-03-12
      • XIA Yayi1 QI Chenze2 WANG Baoyi3 SUN Xudong2 HU Youhua2 WANG Tianmin4 1
        Issue 6, (2005)
        摘要：The measurements of positron annihilation lifetime spectra (PALS) have been performed on high impact polystyrene (HIPS), polypropylene (PP), high density polyethylene (HDPE), low density polyethylene (LDPE) and a number of HIPS-PP,HIPS-HDPE and HIPS-LDPE blends. The results show that the longest lifetime component τ3 remains constant during extending PALS measurement for all measured polymers, and corresponding intensity I3 with time decreases only for several polymers. The decrease of I3 is interpreted as a result of electric field build up during prolonged PALS measurement. The constant I3 with time has been found to correlate with interfacial polarization during measurement and larger size of free volume holes in the polymers.  
        关键词：High impact polystyrene;High density polyethylene;Low density polyethylene;Polypropylene;Blend;Positron annihilation   
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        发布时间：2021-03-12
      • LIU Tianwei1,2 DONG Chuang2 DENG Xinlu2 CHEN Xi3 1
        Issue 6, (2005)
        摘要：The ZrN thin films were prepared on #45 steel by using ECR-microwave plasma source enhanced sputtering. The increase of bias voltages leads to a phase transition from amorphous state to ZrN. The AFM morphology indicates that RMS of the samples, varying from 0.311 to 0.811 nm, first increases and then decreases with increasing bias voltage. The corrosion resistance of ZrN films is gradually increased with increasing bias voltages until –120 V and then decreased. Changes of corrosion resistance can be explained by a droplet type-surface defect.  
        关键词：Plasma enhanced deposition;Unbalanced magnetron sputtering;ZrN films;Bias voltage   
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        发布时间：2021-03-12
      • WU Huailong LIU Suping LIU Xiaoya YANG Xiaobo
        Issue 6, (2005)
        摘要：During the comparative investigation of radiation fingerprint some current gamma spectrum analysis software are found to leave some drawbacks, which result in reduced precision of the radiation fingerprint comparison. We have therefore developed a new analysis software to solve the problem.In order to display the advantage of our program, some typical simulative warhead gamma spectra are analyzed by using our software and GAMMAVISION and GENNIE2000, respectively. The new software can be applied not only in nuclear warhead deep-cuts verification, but also in any radiation measurement field.  
        关键词：Gamma spectra;Spectra analysis;Software   
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        发布时间：2021-03-12
      • DONG Jinmei WANG Shaoming
        Issue 6, (2005)
        摘要：It is extremely important to measuring accurately beam emittance on modulating accelerator beam and evaluating accelerator performance.The paper introduces the ion beam emittance measurement system with the three gradient method on the base of already existed devices of Heavy Ion Research Facility in Lanzhou(HIRFL).It also discusses measure principle , method and some problems to which we pay attention in measurement system. Methods of caculating and processing data are emphasized. Moreover, a suit of software system is designed to realize measurement and display of the beam parameters.The System has good reliability,visual display and accurate measure.  
        关键词：Three gradient method;Emittance;Beam profile   
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        发布时间：2021-03-12
      • WU Xiaolei GAN Zaiguo GUO Junsheng FAN Hongmei QIN Zhi
        Issue 6, (2005)
        摘要：A rotating-wheel set-up used for measuring and studying the heavy nuclei with α-decay was built. This system was tested experimentally by using ion-beam from SFC. The test results prove that this set-up was useful and reliable. It provides simple and effective equipment and technique to synthesize and identify new nuclides of Z=107. in the near future.  
        关键词：Rotating wheel;α-decay chain;Parent-daughter nuclei correlation   
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        发布时间：2021-03-12
      • GU Yunhong QIN Guangyong HUO Yuping
        Issue 6, (2005)
        摘要：Effects of vacuum and implantation on wheat’s POD isozymes produced by low energy ion beam implantation were studied. The same as the control sample, activity of POD isozymes produced by vacuum was increasing with adding the culture time. Activities of POD isozymes of the samples treated with different vacuum time but having the same culture time were increasing with prolonging the vacuum time. Impantated by N+ of different doses, germination rate of wheat seeds had no changes. But sprouting length of the sample implanted by higher dose was evidently shorter than others. Low dose implantation could stimulate POD isozyme’s activity to increase, while high dose implantation could retard POD isozyme’s activity.  
        关键词：Vacuum;Low energy ion beam implantation;Wheat;POD isozymes;Activity   
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        发布时间：2021-03-12
      • HAN Song DONG Jinquan YU Fusheng JIA Xiuqing
        Issue 6, (2005)
        摘要：INAA analysis is considered as an effective method to study the geochemical features of some tiny minerals which are very difficult to be selected from rock samples. Both rare earth elements and trace elements in the rock-forming minerals of the granite from Jiangxi Province, including potash feldspar, plagioclase, quartz, biotite, accessory minerals, zircon and apatite, were analyzed and studied by INAA.Measured data show that the total 8 REE contents of minerals gradually decrease from zircon, apatite, biotite, plagioclase, potash feldspar to quartz in proper order, indicating a crystallization process of the granite. The Eu abnormal of whole rock would be affected by biotite, potash feldspar and plagioclase.  
        关键词：INAA;Rock-forming minerals;REE;Trace elements   
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        发布时间：2021-03-12
      • XIE Juan LIU Fangxin WANG Ying LI Shaolin
        Issue 6, (2005)
        摘要：The purpose of this study was to synthesis and label antisense probe 99Tcm -EC-ASODN which had good stability and biobehavior for tumor imaging. Ethylenedicysteine(EC) was used as a chelator, and conjugated to antisense oligodeoxynucleotides (ASODN) using sulfo-N-hydroxysuccinimide and 1-ethyl-3-(3-dimethyl- aminopropyl) carbodiimide-HCl as coupling agents to form compound EC-ASODN. EC-ASODN is evaluated by 1H nuclear magnetic resonance spectroscopy(1H-NMR), infrared spectroscopy (IR), ultraviolet absorption(UV) and electrophoresis. 99Tcm was labeled to EC-ASODN and the labeling yield, radiochemical purity and stability were assessed. Results of 1H-NMR, IR, UV and electrophoresis confirmed that EC was joined to ASODN, with labeling yield of 77.28%, radiochemical purity of 97.52%, Rf =0.95—1, and very good stability in 4 hours.  
        关键词：99Tcm-EC-ASODN;Antisense probe;1H-NMR;IR   
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        发布时间：2021-03-12
      • TANG Ganghua1 WANG Mingfang1 TANG Xiaolan2 LUO Lei1 GAN Manquan1 1
        Issue 6, (2005)
        摘要：11CH3I was produced at 11CH3I MicroLab Fully Automated Process Module from 11CO2, which was produced via nuclear reaction 14N（p, α）11C at PETtrace Cyclotron. （N-[11C]methyl）choline （11C-CH） was synthesized from [11C]methylation of precursor （CH3）2NCH2CH2OH with 11CH3I on a commercial Sep-Pak Plus C18 cartridge as a solid-phase support material at a semi-automated system and separated by Accell Sep-Pak Plus CM. The corrected radiochemical yield of 11C-CH from 11CO2 was more than 85% with the total synthesis time about 20 min and the radiochemical purity above 99%. （S-[11C]Methyl）-L-cysteine （11C-CYS） was synthesized from [11C]methylation of precursor L-cysteine with 11CH3I on a Sep-Pak Plus C18 cartridge at the semi-automated system. The uncorrected radiochemical yield of 11C-CYS from 11CH3I was more than 85% with the synthesis time about 6 min, the radiochemical purity of 11C-CYS was above 99%, and the enantiomeric purity was over 90%. The synthetic 11C-CH and 11C-CYS injection can be used for preclinical and clinical study with PET imaging.  
        关键词：11CH3I MicroLab Process Module;(N-[11C]Methyl)choline;(S-[11C]Methyl)-L-cysteine;On-column methylation;Semi-automated synthesis   
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        发布时间：2021-03-12
      • JIANG Xinbiao1 ZHAO Ying1 CAO Ruifeng2 XIAO Yan1 CHEN Wei1 TU Jing1 ZHANG Xiang2 1
        Issue 6, (2005)
        摘要：A neutron source of UHZr reactor for C6 glioma cells irradiation is designed by MCNP/4B code. Methods for cell culture,incubation,L-BPA administration,boron concentration measurement and the irradiation experiment are described. Radiobiological effects of C6 glioma cells in vitro,which are induced by BNCT,and the relations between the biological effect and the irradiation dose are studied. The results demonstrate that the cytocidal effect of the BNCT method is much more remarkable than that of gamma radiotherapy at the same absorbed dose.  
        关键词：Uranium hydrogen zirconium reactor;Boron neutron capture therapy (BNCT);C6 glioma cell;Biological effect   
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        发布时间：2021-03-12
      • LU Yang ZHANG Yafei
        Issue 6, (2005)
        摘要：The surface-conduction electron-emitter display (SED) is a newly developed display technology based on tunneling effect by Canon and Toshiba. The working principle of SED is introduced basically, and both multi-scattering model and inertial centrifugal force model are discussed with the purpose of interpreting the behavior of electrons in SED. The situation of various display technologies is briefly reviewed with a comparison between these technologies and SED.  
        关键词：Surface-conduction electron-emitter display;Tunneling effect;Multi-scattering;Inertial centrifugal force   
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        发布时间：2021-03-12
      • ZHAO Xiuliang1 XIAO Yongjun1 ZOU Qihong2 ZHAO Yanhui2 1
        Issue 6, (2005)
        摘要：A current-sensitive preamplifier for the mini-size ( such as φ6 mm × 10 mm) 3He neutron detector used for neutronics characteristics measurement of sub-critical reactor is introduced in this paper. It can be connected with the detector by a coaxial shielded cable which length is up to 10m, and it is propitious to neutron flux measurement at a high counting rate. The current-sensitive preamplifier is based on the chip of AD8004. Its concrete circuit, compo- nent selection and performance parameters are presented.  
        关键词：Current-sensitive preamplifier;Neutron flux measurement;3 He proportional counter   
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        发布时间：2021-03-12
      • QI Huirong1,2 WANG Jinchuan1 XIAO Guoqing1 GUO Zhongyan1 ZHAN Wenlong1 XU hushan1 LI Jiaxing1 SUN Zhiyu1 HU Zhengguo1 MAO Ruishi1,2 LI Chen1,2 CHEN Lixin1 ZHAO Tiecheng1 XU Zhiguo1 WU Lijie1 DING Xianli1 GAO Hui1 1
        Issue 6, (2005)
        摘要：On the outer-target experimental terminal in Heavy Ion Cooling Storage Ring at Lanzhou,an experimental setup for the study of RIB physics and the investigation of features of the asymmetric nuclear matter by means of RIB is highly required. The neutron detection wall is a main part of the detection equipment,in which there are 1000 photomultipliers serving as signal readout devices. The PMTs’ voltage divider is studied. Both design parameters and the measured results show that the timing-type voltage divider is more suitable for detecting time signals.  
        关键词：Heavy ion cooling storage ring;Neutron detection wall;Photomultiplier;Voltage divider   
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        发布时间：2021-03-12
      • QU Guopu LING Qiu GUO Lanying ZHAO Lihong
        Issue 6, (2005)
        摘要：The paper introduced a technique, which is based on the adsorption of 85Kr function on activated carbon, to check-up the decommissioned reactor fuel element cladding. The measuring principle and the constitution of the measuring system are described. The opinion method of safety check-up the decommissioned reactor fuel element cladding is the detection quantity of beta count-rate of adsorption 85Kr by activated carbon. The beta detection efficiency is higher than 40% and background beta count-rate is 0.84 Counts?min–1 of the measuring system. A comparison between the method and chemical analysis to water sample showed that the two conclusions were agreement.  
        关键词：Activated carbon;85Kr;Reactor fuel element cladding;Safety check-up   
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        发布时间：2021-03-12
      • JING Lan1 ZHU Haijun1,2 ZHANG Shuocheng 1 QIAO Weimin1 LIANG Yihai1 1
        Issue 6, (2005)
        摘要：Design of a stepping motor control system based on MSP430F149 single-chip processor is introduced. The system hardware configuration and working principle are described, software design of the control system of the single-chip processor and working procession of the stepping motor are also expatiated in this paper. The system is characteristic of its expansibility and lower cost of development. The system is easy to operate and its software function is perfect . The requirements of 5-phase stepping motor for the national great science engineering project HIRFL-CSR are fulfilled.  
        关键词：5-phase stepping motor;Control system;Single-chip processor;D/A conversion   
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        发布时间：2021-03-12
      • LE Renchang1 JIA Wenyi2 1
        Issue 6, (2005)
        摘要：A directional measurement device has been designed to determine the radon migration in the ideal condition. Both horizontal and vertical migration of radon are studied. The horizontal migration coefficient of radon is 0.024 cm2·s–1, which is much less than 0.1 cm2·s–1, the diffusion coefficient of radon in the air given by the references. The vertical migration coefficient of radon is 0.182 cm2·s–1, which is considerably greater than the diffusion coefficient of radon in the air.  
        关键词：Radon;Migration;Diffusion coefficient;Directional measurement   
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        发布时间：2021-03-12
      • DANG Bingrong LI Wenjian
        Issue 6, (2005)
        摘要：Empirical formulas play important role in some theoretical calculations in applied nuclear physics. There are lots of empirical formulas for total cross section of nuclear reaction. In this paper, we use Kox empirical formula as a basis to estimate doses in tumor therapy with heavy ions. We have revised some parameters of Kox empirical formula in order to get more precise values in the application. At the same time, the physical meaning of these revised parameters are discussed.  
        关键词：Nuclear reaction cross section;Tumor therapy with heavy ions;Kox empirical formula   
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        发布时间：2021-03-12
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