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      卷 0 ， 期 0 ， 2020
      • Weicheng Zhang
        Vol. 12, Issue 11, (1989)
        摘要：Stable isotopes as tracers in biology and medicine have been more extensively used. Mass spectrometry has been a classic technique in the analysis of stable isotopes because it is very sensitive and precise. Activation analysis has recently been introduced as an analytical tool. Its fast speed and simplicity is a great advantage for handling large batches of sample in isotopic tracer experiments. The combination of enriched stable isotope tracer studies and activation analysis techniques has become an ideal and reliable technique, especially in the fields of biology and medicine. This paper presents a survey of the fundamental principle, the character and the applications in biology and medicine for the suitable activated stable isotope tracer techniques.  
        关键词：Stable isotopic tracer experiments;Activation analysis;Applications in biology and medicine   
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        发布时间：2022-08-16
      • Xianyi Zhou,Huilin Jiang,Shuying Wang,Jian Jiang,Qiwei Long
        Vol. 12, Issue 11, (1989)
        摘要：The relationship between positron mean lifetime and grain size, based on two state trapping model, has been developed, and the saturation trapping at grain boundaries has been predicated. Experimetally, the relationship is tested and verified through the positron trapping at grain boundaries of Zn-22wt. % Al alloys. A general situation of positron trapping at large angle grain boundaries is discussed.  
        关键词：Grain boundary;Positron lifetime;Saturation trapping   
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        发布时间：2022-08-16
      • Yuande Qiu,Jinhua Liang
        Vol. 12, Issue 11, (1989)
        摘要：A feasibility study has been made on looking for gold with gamma-spectrometry in an area of gold-quartz vein, Shandong Province. By surveying the data, we concluded that the radioactive element contents are higher in the alteration zone, middle in the mixed granite and lower in the ore veins. There exist some anomalies of potassium thorium and total content on the sections across the ore veins. The linked lines of ael points just show the strides of the ore veins.  
        关键词：Gamma-spectrometry;Gold;Peak-to-background ratio   
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        发布时间：2022-08-16
      • Liyi Lu,Zhangshu Han,Daihong Dai,Han Lin,Yi Tian
        Vol. 12, Issue 11, (1989)
        摘要：The preparation of 125I (131I) -anti-CEA monoclonal antibody by using several radioiodination methods (Iodogen, ChT, NBS, and Bolton-Hunter reagent etc.) was described. Purification of the product was carried out by the Sephadex G-50 (or 75) gel-filtration column. Its radiochemical purity checked by paper chromatography and HPLC was satisfactory for use. The labelled antibody showed good immunoreactivity, when it was measured by IRMA-bi-antibody sandwich method. The comparative studies for above several radioiodination methods were carried out, among which the iodination efficiency of NBS method was the best (98%) while the immunoreactivity of Iodogen method was the best and specific binding of labelled antibody to CEA was 9960 cpm (3ng CEA/250 µl) .  
        关键词：Iodogen method;ChT method;NBS method;Bolton-Hunter reagent method;IRMA;HPLC   
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        发布时间：2022-08-16
      • Yupu Li,Peixuan Wang,Jiarui Liu,Peiran Zhu,Feng Yang,Guoguang Zhang,Ruzhang Ma
        Vol. 12, Issue 11, (1989)
        摘要：Implanted He in SS316L has been studied by means of proton elastic scattering. He ions were implanted with energies of 30—170 keV and doses of 1016—3×1017/cm2 at temperatures of 77—673 K. At RT and below that, it is found that He is efficiently trapped and the maximum concentration CHe increases linearly with the dose. At higher temperature Q, the total amount of trapped He decreases with increasing temperature for a given dose. This implies that He re-emission has to be taken into account at higher temperature. A comparison of He depth profiles for various target temperatures suggests that the He trapping and mobility during implantation are dependent on the temperature.  
        关键词：Proton elastic scattering;Stainless steel;He implantation;He trapping;He re-emission   
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        发布时间：2022-08-16
      • Changmao Chen,Min Tan
        Vol. 12, Issue 11, (1989)
        摘要：The detection efficiencies of thermal neutron counters with three typical shapes (parallel-plate, spheric and cylindric) and the correction coefficients for Maxwellian spectra are calculated. The experimental results are obtained and a comparison with the calculation is made.  
        关键词：Thermal neutron counter;Detection efficiency;Spectral correction coefficient   
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        发布时间：2022-08-16
      • Yunsheng Dai,Dairong Wan,Xuecai Liang,Jianhua Cao
        Vol. 12, Issue 11, (1989)
        摘要：The elastically scattering differential cross sections of 14.7 MeV neutrons on Fe at angles between 3.76° and 7.98° are measured. The associated particle time-of-flight method is used to select 14.7 MeV neutrons, which originated from T (d, n) 4He reaction at the angle near 40° with respect to a 200 keV deuteron beam. The scattering angles and spectra of neutrons are simultaneously determined with a position-sensitive detecting system.The corrections for neutron flux attenuation, multiple scattering and finite geometry were performed by Monte Carlo method. The experimental results were compared with the available data from other work.  
        关键词：Position-sensitive detecting system;Monte Carlo method   
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        发布时间：2022-08-16
      • Xiuying Wang,Suxian Ge,Jianhua Yin,Xu Yin,Genming Jin
        Vol. 12, Issue 11, (1989)
        摘要：The preparation method and equipment for thin metal self-supporting target without oil contamination are described. The influence of target films contaminated by oil vapor on accuracy of nuclear-physics experimental data are also discussed. The analytical results on carbon content in the prepared films of three elements show that the equipment is very effective for eliminating contamination.  
        关键词：Self-supporting target film without oil;Vacuum system   
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        发布时间：2022-08-16
      • Kezhi Zhang
        Vol. 12, Issue 11, (1989)
        摘要：Based on the law of scanning movement of electrons, a function generator has been used in the design of a scanning power supply for accelerator-generated electron beam, resulting in the ideal scanning signals with good uniformity at enlarging scanning angle.  
        关键词：Scanning uniformity;Function generator   
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        发布时间：2022-08-16
      • Changnian Sun,Jianxin Chen,Xianzhou Zeng,Jianmei Che,Guohun Tang,Fayang Huang,Xide Wang,Mingxing Wang,Weixiu Lu,Lixin Ren
        Vol. 12, Issue 11, (1989)
        摘要：Thousands of atmospheric aerosol samples have been analyzed by PIXE at Accelerator Lab. of Fudan University. These samples were sampled in Shanghai, Beijing, Tianjin, Taiyuan, Lhasa, on the Mt. Jolmo Lunma and at the Great Wall Station of China in the Antarctica, etc. In this paper, the concentrations of 12 main elements i.e. Al, Si, S, Cl, K, Ca, Ti, Fe, Cu, Zn, Pb and Br, in the atmospheric aerosol samples are listed and the variations of some elemental concentrations with aerosol particle size and with time are shown. Some kinds of pollution sources in Beijing are discussed.  
        关键词：Aerosol;PIXE   
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        发布时间：2022-08-16
      • Qi Huang,Qingsheng Liang
        Vol. 12, Issue 11, (1989)
        摘要：The distribution characteristics of tritium in natural water in the area of Qinghai Lake is presented. The content of tritium in natural water averages 342±33T.U., but the average content in river and well water is 316±30 T.U. and that in lake water is 363土34 T.U.. The content of tritium in river water changes with season. The distribution of tritium in surface water is homogenous while the vertical distribution changes with the temperature of water.  
        关键词：Liquid scintillation counting;natural water;Tritium;Dilution.   
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        发布时间：2022-08-16
      • Caixuan Wu,Zhiqun Deng,Xinyong Wang,Bingnan Wu,Zhaohua Gao
        Vol. 12, Issue 11, (1989)
        摘要：The well-like structure of ferro-concrete was usually used as the protection layer in the construction of 60Co irradiators. In this paper, the design character of a 60Co irradiation device which was protected with soil layer under the ground and the result of its safety test were reported.  
        关键词：60Co irradiator;Underground irradiation;field Safety test   
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        发布时间：2022-08-16
      • Siying Zheng,Shoupeng Zhu,Liuyi Wang,Guanhua Lai,Xiuying Zhao,Shuqin Yang
        Vol. 12, Issue 11, (1989)
        摘要：This paper presents a study on the chromosome aberrations induced by selective retention of 147Pm in liver and bone marrow cells of BALB/C strain mice that have been injected large doses of 147Pm. It was shown that large doses of 147Pm induced chromosome aberrations in regenerated liver and bone marrow cells, and chromatid breakage appeared predominant. The larger the doses, the higher the chromosome aberrations. Regenerated liver cell aberrations were higher than marrow cell aberrations. At the same time the cytotoxicity induced by large dosage of 147Pm is designable and the body cell divisions were depressed.  
        关键词：Fragment 147Pm;Chromosome aberrations;Selective retention;Cytotoxicity   
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        发布时间：2022-08-16
      • Lanhua Lou
        Vol. 12, Issue 11, (1989)
        摘要：An improvement in the sensitivity of the RIA kit of cyclic guanosine monophosphate by an acetylation process before use is reported. Employing this process the binding rate of antigen and antibody was obviously increased. Thus the required amount of antibody was saved by 2 to 3 times. A method for more efficient utilization of the kit by protecting the antibody with bovine serum albumin solution and by controlling the temperature of freezing-thawing is also described.  
        关键词：Cyclic guanosine monophosphate;cGMP RIA kit;Antibody   
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        发布时间：2022-08-16
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