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      • Xianzhou Zeng,Guoqing Zhao,Fujia Yang
        Vol. 11, Issue 10, (1988)
        摘要：This paper describes the recent progress in the nuclear analysis techniques based on small accelerator (PIXE, RBS, NRA, AMS etc.), as well as in the nuclear technique of medical imaging (γ camera, SPECT, PET, NMRI etc).  
        关键词：Nuclear technique;nuclear analysis technique;medical imaging   
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        发布时间：2022-08-16
      • Shizhen Wang
        Vol. 11, Issue 10, (1988)
        摘要：Nuclear medicine in China has progressed rapidly in the past few years. The Chinese Society of Nuclear Medicine was founded in 1980 and started to publish the Chinese Journal of Nuclear Medicine in 1981. Three nuclear medicine centers have been established and an experimental PET machine has been built. Gamm cameras gradually replace scanners. Practically all the radionuclide imaging procedures, functional tests and therapies performed in the developed countries are being put into practice in China. RIA and other in-vitro assays make a great contribution to the health care in China. Both radioactive and stable isotopes are widely used in biomedical research, producing many fruitful results. However, the levels of development varies considerably in different parts of the country. There is still much room for improvement in our work. Intense effort should be focused on awakening of awareness that nuclear medicine is indispensable to promote health and even to safe life.  
        关键词：Nuclear medicine;China   
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        发布时间：2022-08-16
      • 冠仁 徐
        Vol. 11, Issue 10, (1988)
        摘要：中国已建立了26个原子能农业利用研究所, 分布在各省、市、自治区, 形成一个科研网络; 还成立了21个原子能农学会, 挂靠在各研究所, 形成一个学术交流网络. 这两个网络的主要活动有: (1) 研究; (2) 教学与培训; (3) 学术交流; (4) 推广与技术服务. 本文概述了近年来在各方面取得的进展与成就. 所有这些研究均与中国当前的 "星火计划" 、 "高技术计划" 以及 "基础研究计划" 紧密配合, 其长远目标在于推进生物产业的发展.  
        关键词：中国;核技术;同位素;辐射;生物产业;农业   
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        发布时间：2022-08-16
      • Lun Xiao
        Vol. 11, Issue 10, (1988)
        摘要：The history of the discovery of artificial radionuclides since 1934 is reviewed briefly. It has been found that the increase of the number of artificial radioisotopes with the years is beautifully linear with a discovery rate of approximately 50 new artificial radioisotopes per year.  
        关键词：artificial radioisotopes;number of artificial radionuclides   
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        发布时间：2022-08-16
      • Jiahua Zhang,Borong Bao,Yuanxian Xia
        Vol. 11, Issue 10, (1988)
        摘要：In the past over years the research and development on the thorium-uranium fuel cycle have been carried out at Shanghai Institute of Nuclear Research, particularily on the preparation of pure 233U, reprocessing of thorium-based spent fuel, new extractive systems for thorium and uranium, new methods of separation and analysis of thorium, uranium and protactinium, basic research on utilization of thorium-based nuclear fuel, and critical experiments of thorium. In this paper the perspective of thorium utilization in nuclear reactors has also been evaluated.  
        关键词：Thorium;uranium-233;thorium fuel cycle;reprocessing chemistry;Separation;thorium utilization in reactors   
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        发布时间：2022-08-16
      • Junquan Xu
        Vol. 11, Issue 10, (1988)
        摘要：A systematic description of the de-excitation model of atomic L-shell vacancies for medium elements is presented, for interpreting relative intensities of observed satellite and diagram X-ray lines in terms of the L1-subshell ionization cross sections, level widths, shakeoff probabilities, and Coster-Kronig and radiative yields. From analysis of the model, L1-subshell level widths, M-electron shakeoff probabilities, L1-subshell fluorescence yields, L1-L2M4.5 and L1-L3M4.5 Coster-Kronig transition yields are given here, in the light of the measured relative L X-ray intensities of elements Rb-Ba for proton-，photo-, and electron-ionizations, reported before. A comparison of the present results of T1 with theoretical calculations, compiled data and experimental values is also given.  
        关键词：elements Rb-Ba;multiple-hole state;diagram X-ray;satellite X-ray;level width;L1-L2M4.5 and L1-L3M4.5 transitions   
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        发布时间：2022-08-16
      • Tonghe Zhang,Guohui Li,Yuguang Wu
        Vol. 11, Issue 10, (1988)
        摘要：A transient-enhanced diffusion has been observed during the furnace or rapid thermal annealing of As-implanted Si. We have studied the relations of the enhanced diffusion to residual defects and lattice restoration in detail. The As concentration profiles and residual defects are measured. It is found from the data that the lattice has been restored when the implanted sample is annealed at 1150℃ (or 1050℃) for 1s. The defeet density decreases rapidly with increase of annealing time (from 1 to 12s). The enhanced diffusion coefficient maximum appears in the annealing time ranging from 1 to 5s. Almost a "complete" annealing of displacement damage is obtained and the diffusion coefficient is less than that in above-mentioned conditions when the implanted samples are annealed at 1150℃in the time ranging from 12 to 20s. The mechanism of lattice restoration and enhanced diffusion in annealing process have been discussed.  
        关键词：model of enhanced diffusion;As implantation;Rapid thermal annealing;lattice restoration   
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        发布时间：2022-08-16
      • Jiadi Qu,Yikang Dou
        Vol. 11, Issue 10, (1988)
        摘要：In this paper fundamental equations of sealing analysis for vessels are given and a computer program named SMEC, which considers the change of stud loading, the elastic contact between flange mating surfaces and the transient thermal effects, is developed, accordingly. The SMEC is verified by several tests. On the basis of analysis, a new concept of classifying vessels into three types according to increasing or decreasing of bolt loading with increasing pressure is suggested. Type-A vessel is that in which the bolt loading increases monotonically with increasing pressure, while in type-B, the bolt loading decreases monotonically, and in type-C, the bolt loading changes nonmonotonically. It is important for vessel design to distinguish the types through analysis. The sealing mechanism is also discussed.  
        关键词：PWR;nuclear vessel;sealing analysis;thermoelastic coupling;two-body elastoplastic contact   
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        发布时间：2022-08-16
      • Jianguo Pang,Tianjian Shen,Shaoqi Yang,Zhenguang Huang,Ming Gu
        Vol. 11, Issue 10, (1988)
        摘要：In this paper an instrument system designed for measuring natural γ-energy specrum (U, Th, K) is described. The accuracy for measuring uranium and thorium is better than 1.5 ppm, and for measuring potassium is better than 0.5%.  
        关键词：well logging;Porosity;lithologic character;shale content;energy window;Spectrum stabilization;spectrum unscrambling   
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        发布时间：2022-08-16
      • Fugen Chen,Zhongwen Lu,Xiangrong Xue,Zewu Yao,Bende Du,Zhicheng Xu,Kangsen Du
        Vol. 11, Issue 10, (1988)
        摘要：Shanghai Irradiation Center, situated in western suburb of Shanghai, was completed in August, 1986. At present, a 6.55×1015 Bq 60Co source has been loaded, though the designed acticity of maximum loading is 18.5×1015 Bq. The center is designed mainly for irradiation preservation of food and sterilization of medical devices and tools. Its processing ability is 10 t/h for potatoes.  
        关键词：irradiation hall;Radiation source;radiation processing   
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        发布时间：2022-08-16
      • Chunhan Tong,Rongsheng Zhou,Heguo Guan,Xiaolin Li,Youning Li
        Vol. 11, Issue 10, (1988)
        摘要：The technique of reactor neutron activation analysis was developed in the early 1980's in China. It can be widely employed in geological research.This paper mentioned the work carried out by us in recent years. The following topics were included: precious metal prospecting and assessment. especially for the minute grain Au and Ag deposits; geochemical prospecting and tracing uranium sources; distinguishing silicolites of different origins; comprehensive utilization of mineral resources; and the research on reference standard samples as well.  
        关键词：NAA;geological research;Application   
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        发布时间：2022-08-16
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