最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 7, (1996)
        摘要：The variations of vacancy concentration with carrier concentration, conductivity and dislocation density were studied by the positron annihilation lifetime technique for the InP samples doped with both multiimpurities and single Sn.  
        关键词：Position annihilation;InP semiconductor   
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        发布时间：2021-04-09
      • Issue 7, (1996)
        摘要：Measurements have been made of tissue free water tritium（TFWT） and organically bound tritium（OBT） in food samples from Beijing, Lanzhou, Shanghai and Chengdu districts. The average TFWT and OBT concentration is 4.56Bq/L and 29.51Bq/L, respectively. And the SAR,the ratio of OBT to TFWT, is 6.47. The OBT concentration in food is found to be decreasing with latitude of the district.And the relation of the OBT concentrations with latitudes can be described by a linear equation. It is also found that the OBT concentrations in plant are significantly higher than that in animal food.  
        关键词：Tritium;Food;Tissue free water tritium;Organically bound tritium;Latitude   
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        发布时间：2021-04-09
      • Hou Xiaolin
        Issue 7, (1996)
        摘要：Instrumental neutron activation analysis was used to determine 33 elements in petal and pedicel of Saussurea involucrate from five different growing places and 14elements in surface laper and nucleus of nstural pearl.The contents of elements in Saussurea involucrate taken from different places are different, which shows that the growing place of a Chinese medicine seems to be directly related to its composition and medical efficiency. The contents of elements in different parts of Saussurea involucrate of pearl are also different, which indicates that the medical efficiency may not be alike for different parts of a Chinese medicine.  
        关键词：Saussurea involucrate;Pearl;Trace elements;Neutron activation analysis   
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        发布时间：2021-04-09
      • Zhai Pengji
        Issue 7, (1996)
        摘要：Characteristics of recording fission tracks and homogeneity of track distribution between NBS--SRM612 glass dosimeter and a home--made one were compared. The results show that the latter is similar or superior to the former. For a home--made dosimeter glass used in fission track dating, a relative error of less than 5% can be obtained.  
        关键词：Uranium dosimeter glass;Fission tracks;Response;Homogeneity   
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        发布时间：2021-04-09
      • Issue 7, (1996)
        摘要：Progress in theoretical work on track structure and energy deposition distribution of heavy ions is introduced, and some results are given, including a Monte Carlo model for calculating the heavy ion track structure, and the calculations of probability distribution of energy deposition inside an electron track,and of radial dose distribution around a heavy ion path.  
        关键词：Heavy ions;Track structure;Energy deposition;Biological effect   
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        发布时间：2021-04-09
      • Luo Daling
        Issue 7, (1996)
        摘要：It is assumed that a dose response function derived from the statistical poisson distribution can be used to describe the TL dose responses. Two parameters in this function, one--hit factor R and characteristic dose D0, not only have statistical meaning but also contain dosimetric significance. When coupling with the microscopic mechanism for the TL process, dominant features of the nonlinear phenomena observed in experiments can be explained.  
        关键词：TL dosimeters;Response function;Nonlinerity;Characteristic parameters   
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        发布时间：2021-04-09
      • Issue 7, (1996)
        摘要：The optimum labelling condition was established for using a new bifunctional chelating agent （DOTA-Peptide） in 90Y-labelled monoclonal antibody Lym-1 by the pre-labelling method, in which the 90Y was first labelled to the bifunctional chelating agent and then conjugated to the monoclonal antibody. The results showed that the radiolabelling procedure was reasonable and the radioactivity yield in products was satisfactory. The radiochendcal purity of 90Y-labelled Lym-1 was determined to be over 95% by gel filtration HPLC and silica gel TLC. The immunoreactivity of the final product was found to be greater than 100% relative to 125I-Lym-1 （as a standard） by in vitro cell binding assay.  
        关键词：Yttrium-90;Bifunctional chelating agent;Monoclonal antibody;Labelling   
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        发布时间：2021-04-09
      • Shi Zikang
        Issue 7, (1996)
        摘要：In this paper a new technique to determine positive （or negative） polarity orientation for the ion--type crystals based on the positron annihilation lifetime spectroscopy has been expounded. This technique can be adopted for the production of the ion-type polar crystals.  
        关键词：Positron annihilation technique;Ion-type polar crystals;Polarity orientation   
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        <引用本文> <批量引用> 8412330 false
        发布时间：2021-04-09
      • Issue 7, (1996)
        摘要：he 47Ca radioactive tracer and neutron activation analysis were used to study the pharmacodynamics, distribution and absorption of a new calcium supplement in rabbit prepared by plasma technology. Our results indicate that calcium from the new nutrient is mainly deposited in bone 6 or 7 days after oral administration. The absorption rate of this new calcium preparation is esthoated to be 30%--40%.  
        关键词：Calcitun supplement;Radioactive tracing;Neutron activation analysis;Bioavailability   
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        <引用本文> <批量引用> 8412113 false
        发布时间：2021-04-09
      • Issue 7, (1996)
        摘要：A radioactive tracing technique was used to estimate the environmental safeness of a weedicide （bensulfuron-methyl）. It was revealed that different kinds of waterlogged soil have different speeds of degradation for 14C-bensulfuron-methyl applied under a dark culture condition indoor. The degradation in alkaline soil is slower than that in neapal soil, e.g. in neutral yellow brown end the residual half-life is 62 dsys, whereas that in alkaline yellow fluvo-aquiv earth is 129 days.The bound residue of 14 C-be nsulfuron-methyl in waterlogged soil is evident and increases with time. For example, on the 104th day, the bound residue is 34.15% of primitive activity while that on the 165th day is 46.45%.  
        关键词：Bensulfuron-methyl;Waterlogged soil;Residual half-life;Bound residue   
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        发布时间：2021-04-09
      • Issue 7, (1996)
        摘要：An equivalent circuit is used to obtain the output waveform of a short pulse grid pulser for an electron LINAC, and the amplitude of the output pulse is studied as a function of number of switching tyansistors for some kinds of transistor. Two pulsers were fabricated to fulfil the requirements of the 200MeV LINAC at NSRL.  
        关键词：Grid pulser for electron gun;Switching transistor;Avalanche process;Beam pulse   
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        <引用本文> <批量引用> 8412141 false
        发布时间：2021-04-09
      • Issue 7, (1996)
        摘要：Ti and N ions are simultaneously introduced into precise mini-bearing balls （1.57-- 1.60mm） by the dynamic ion--beam mixing technique. Uniformity of the implanted elements and their depth profiles in the matrix are examined by AES and EDAX analysis. The results indicate that the mini--balls treated by means of ion beams have heterogeneities of less than 13% for the same ball surface and of less than 15% for different balls, and a mixed zone of more than 140nm is found. It is believed that the bearing balls treated as such can satisfy the requirements to the practical application under suitable processing conditions.  
        关键词：Ball bearing;Dynamic ion beam mixing;Uniformity   
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        发布时间：2021-04-09
      • Issue 7, (1996)
        摘要：At room temperature, samples of single crystal a --SiO2 were implanted with Ag+at 200kV potential to 6.7×1016 ions/cm2. The structure and optical absorption of the implanted SiO2 layer were investigated by means of Raman, XPS, RBS, TEM and optical absorption spectroscopy. The Raman spectya prove that SiO2 amorphous layer is formed in the surface of single crystal SiO2 implanted with 6.7 × 1016 Ag+/cm2. The XPS result indicates that silver exists in a metallic state in the implanted layer. And the RBS analysis illustrates that the depth distribution of the implanted Ag is bimodal in shape. The bright--field TEM adage shows that the nano--sized spherical particles of Ag are formed in the implanted layer, with two kinds of maan sizes, i.e.about 25nm and 5nm respectively. The size distribution for the larger particles is considerably narrow. The optical absorption spectya demonstrate that three absorption bands exist around 404nm, 210nm and 620nm respectively. The absorption around 404nm results from the surface plasmon resonance of silver particles, and the others are attributed to the defects caused by implantation.  
        关键词：Single crystal α-SiO2;Ag ion Anplantation;Nano-sized particles;Optical absorption   
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        发布时间：2021-04-09
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