最新刊期
      卷 0 ， 期 0 ， 2020
      • Huang Yan Hei Zukun
        Issue 6, (1997)
        摘要：A beam of Mo ions with an accelerating voltage of 50kV and a dose of 2×10 17 ions/cm 2 has been implanted in the Austenitic stainless steel with 1150℃ solution heat treatment. The cross-section substructures of the implanted samples were studied with the weak beam technique of the transmission electron microscopy. It was found that depth of the radiation damage was far greater than the ion range, and the substructure was the complex dislocation configuration similar to the effect of the work hardening. The reason of the so-called “long-range effect” of the work hardening in the ion-implanted materials affected by the radiation damages has been discussed.  
        关键词：Ion implantation;Austenitic stainless steel;Dislocation   
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        发布时间：2021-04-09
      • Zhou Xiaohong Sun Xiangfu Guo Yingxiang Lei Xiangguo Liu Zhong Zhang Yuhu Chen Xinfeng Jin Hanjuan Luo Yixiao
        Issue 6, (1997)
        摘要：Presented is a new method to determine γ ray angular distribution with six BGO（AC）HPGe detectors, which are located at different angles relative to the beam direction, to measure γ rays simultaneously. The relative detection efficiencies for these detectors are normalized by using target radioactivity.  
        关键词：γ ray angular distribution;Relative detection efficiency   
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        发布时间：2021-04-09
      • Yin Chuanyuan Zhou Caihua
        Issue 6, (1997)
        摘要：A methylvinyl silicone rubber and a room-temperature vulcanized（RTV） graft silicone rubber were studied with the positron annihilation technique. It is shown that τ 1 and τ 2 for the RTV rubber are longer than those in the former, but τ 3 is shorter than these for the former. A qualitative explanation for the facts is given.  
        关键词：Positron annihilation;Methylvinyl silicone rubber;Room temperature vulcanized graft silicone rubber   
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        发布时间：2021-04-09
      • Liu Changshi
        Issue 6, (1997)
        摘要：The mean ionization excitation energy values for Al, Ti, Fe, Cu and Ta have been derived from the Landan equation and by measuring the most probable energy loss of electrons from a 207 Bi source. The results are consistent with the values given by references,and this method can be regarded as a quick, easy and accurate one to experimentally evaluate the mean ionization excitation energy values.  
        关键词：The most probable energy loss;Mean ionization excitation energy;Landan equation   
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        发布时间：2021-04-09
      • Chen Dongfeng Gou Cheng Sun Kai Yang Jilian
        Issue 6, (1997)
        摘要：The crystallographic and magnetic structure of YFe 10 Mo 2N 0 75 was studied by the powder neutron diffraction technique using a neutron triple-axia spectrometer at room temperature. The fractional occupancies of Mo and N atoms and the magnetic moments of Fe atoms were obtained by Rietveld analysis program FULLPROF. The intrinsic magnetic properties were discussed.  
        关键词：Neutron diffraction;Crystallographic structure;Magnetic structure;Intrinsic magnetic properties   
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        发布时间：2021-04-09
      • Feng Weiyue Chai Zhifang Qian Qinfang
        Issue 6, (1997)
        摘要：The levels of mercury and selenium and their correlation in scalp hair samples of 29 pairs of women and their newborn children living at a high-Hg and low-Se area the Second Songhuajiang River System have been studied by instrumental neutron activation analysis. Our results indicate that the Hg level in infant hair samples roughly equals to that in their mother’s, while the Se level in infants is much higher. The molar ratios of Se/Hg in baby’s hair are also 40% higher than those in mother’s. It is demonstrated that infant is able to absorb more selenium from mother’s body to protect from or alleviate the intoxication of mercury. The autoprotection mechanism likely plays an extremely critical role during the development stage of foetus.  
        关键词：Mercury;Selenium;Scalp hair;Neutron activation analysis   
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        发布时间：2021-04-09
      • Yin Xinmin Zhang Xiang Sun Tongyu Qin Zhi Zhao Lili
        Issue 6, (1997)
        摘要：A kind of multitracer has been prepared from the interaction of selenium with 25MeV/A 40 Ar ions. By using off-line gamma ray spectrometry, it is identified that the multitracer contain 47 kinds of radioactive nuclides belonging to 24 elements. The nuclide with the longest half-life is 22 Na and that with the shortest half-life is 81g Rb。  
        关键词：Off-line gamma ray spectrometry;40 Ar+Se reaction;Multitracer   
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        发布时间：2021-04-09
      • Leng Yongbin Wang Jihong
        Issue 6, (1997)
        摘要：A main magnet power supply control system used in 800MeV electron storage ring at National Synchrotron Radiation Laboratory is introduced. Design of the ramping control board, one of the most important parts, is described in detail.  
        关键词：Synchrotron radiation facility;VME;Ramping   
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        <引用本文> <批量引用> 8415115 false
        发布时间：2021-04-09
      • Qi Zhong Guo Zhongyan Zhan Wenlong Zhou Jianqun Liu Guanhua Zhang Wansheng Wang Jinchuan Lin Yuangen Zhu Yongtai Xu Hushan Xie Yuanxiang
        Issue 6, (1997)
        摘要：The phoswich telescope is composed of a plastic scintillator NE102A （1mm thick） and a slow scintillator NE115 （100mm thick）. The signal from PMT anode is processed through the fast-slow gate QDC method. A good elemental resolution Z/ΔZ～45 is achieved in the region of Z≤20.  
        关键词：Intermediate energy heavy ion;Scintillator;Phoswich;Element resolution   
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        发布时间：2021-04-09
      • He Jingtang Mao Yufang Dong Xiaoli Chen Duanbao Zhu Guoyi Jin Bingnian
        Issue 6, (1997)
        摘要：In this paper the experimental results on properties of the PbWO 4 crystal are reported, including the exitation and fluorescence spectra, absolute and relative light yield, and decay times. It seems that the PbWO 4 crystal can be used in high energy physics experiments for detecting high energy shower particles.  
        关键词：PbWO 4 crystal;Light yield;Decay time   
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        发布时间：2021-04-09
      • Liu Hongfu Bai Chunming Cheng Xiaoping Wang Guangzhong
        Issue 6, (1997)
        摘要：Experiments both on the vertical distribution of radon in shallow soil and on the lateral extension of radon at depths of 20,40 and 60 cm,were carried out. It is found that the mechanism of radon transportation from deep to shallow soil is changeable and many factors may disturb the radon measurement. A comprehensive correcting factor D was introduced and its evaluation and application were described.  
        关键词：Radon measurement;Radon transportation   
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        <引用本文> <批量引用> 8414406 false
        发布时间：2021-04-09
      • Zhang Jianguo Cui Yunlong Gong Jinlong Lin Senhao Rong Tingwen
        Issue 6, (1997)
        摘要：Pristine C 60 films sublimed onto sheel mica were implanted with 20keV Li + ions and N + 2 ions, respectively, at doses from 0 5×10 16 /cm 2 to 5 0×10 16 /cm 2 The change of electric conductivity with temperature of the films was measured. The effects of oxygen and irradiation damage on the films were analysed. It is shown that the impact of Li + ions is more obvious than that of N + 2 ions, and a functional relation between electric conductivity and temperature is given for C 60 films ion-implanted on different conditions.  
        关键词：C 60 film;Electric conductivity;Ion-implantation   
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        发布时间：2021-04-09
      • Li Wenjian Wei Zengquan Xie Hongmei Huang Xinmin
        Issue 6, (1997)
        摘要：A specially designed irradiation equipment for investigating biological effects of mammalian cells is described. The irradiation uniformity of the equipment was examined with irradiated and then etched polycarbonate films, and the effect of irradiation dose on the uniformity was discussed.  
        关键词：Heavy ion;Cell;Irradiation equipment;Uniformity   
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        <引用本文> <批量引用> 8414418 false
        发布时间：2021-04-09
      • Shen Qingkang Bao Jianzhong Chen Xiulan Gao Zhonglin Wang Jinrong Cao Hong Kong Yong
        Issue 6, (1997)
        摘要：Described are some technical details of rebuilding a small cobalt room,including special tools, adopted safety measures and practical procedure for transshipment of 3 7PBq cobalt sources.  
        关键词：Cobalt room;Cobalt source transshipment;Safety measures   
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        发布时间：2021-04-09
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