最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 4, (1996)
        摘要：amples of the 6H a-SiC crystal have been implanted with a variety of doses of silver ions from a MEVVA ion source at 50 kV potential and room temperature.Tests including microhardness measurements, SEM of indentations, Raman spectrography, RBS and XPS were carried out. The results indicate that the SiC crystal is changed from a brittle state into a ductile one by Ag ion implantation and an amorphous layer is formed at the surface of the implanted a-SiC sample. The lowest dose for the formation of amorphous state is about 1014-1015 Ag+/cm2. XPS of Ag3d5/2 for the sample implanted with 5 × 1016Ag+/cm2 shows that in the implanted layer of SiC, silver exists in a metallic state. According to the features of the MEVVA ion source which produces multiple charged silver ions, the present results are discussed and compared with those from literatures.  
        关键词：Single crystal α-SiC;MEVVA ion source;Ion implantation Ag;Ceramics;Amorphous state   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：ossibility of analysing radio-nuclides with super-sensitive mini-cyclotron accelerator mass spectrometer is discussed theoretically in detail. The result shows that many radio-nuclides besides 14C, for example 3H, 26Al, 4oK and 44Ti, can also be analysed with our present AMS device. With some technological improvement,analysis of more nuclides will be possible in the future.  
        关键词：Accelerator mass spectrometer;Radio-nuclide;Resolution   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：Aerosol samples were collected using Anderson cascade impact samplers and the dispersed single aerosol partiles were embedded in thin PVDF films. A group of single aerosol particles distributed in an area of 180 μm×150μm was analyzed by the scanning proton microprobe（SPM）. The distributions of 12 elements in the group were mapped with the three dimensional contour technique. Air pollution sources were then analyzed in some details. It is shown that analysis of the group of single aerosol particles by SPM may become a new approach to the study of air pollution.  
        关键词：Single aerosol particles;Air pollution;Scanning proton microprobe   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：Developments in the production of 123Ⅰ by cyclotrons and electron accelerators were reviewed. Among many methods 124Te（P,2n）123Ⅰ,123Te（p,n）123Ⅰ, 122Te（d,n）123Ⅰ,127Ⅰ（p,5n）123Xe→123Ⅰ,124Xe（p,x）123Ⅰ and 124Xe（γ,n）123Xe→123Ⅰ were discussed in detail.The advantages and disadvantages for each method were compared. A brief intyoduction of 123Ⅰ production in SINR was given.  
        关键词：?production;Cyclotron;Electron accelerator   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：Some recent applications of metal ion implantation by using MEVVA ion sources are reviewed, including the preparation of metal-silicide layer, magnetic film,quasi-crystal and surface composite material, and the researches concerning electrocatalysis, corrosion resistance, high-temperature oxidation resistance, fatigue,weathering of phosphate glass, etc. It is evident that, as a surface alloying method or an ion-beam irradiation method, ion implantation using MEVVA ion sources can effectively approve the physical, chemical, electionic, magnetic and mechanical properties of metal, ceramic and glass surface.  
        关键词：MEVVA ion source;Ion implantation;Surface modification   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：he variation of conducting and mechanical performances of polyaniline （PAn） and its conductive composite films （PAn/PVC and PAn/LPES） after γ-irradiation are studied. It is shown that both conductivity and tensile strength are improved after low-dose γ-irradiation （<104Gy）, but getting worse under high-dose irradiation. A brief discussion is then given.  
        关键词：Polyaniline;Conductive composite film;γ-irradiation   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：Adsorption of 153Sm-EDTMP and effect of several coexisting substances on adsorption and desorption were investigated using hydroxyapatite （HA） as a skeleton model and 153Sm as a tracer. The adsorption is shown to be quantitative up to total deposition of 40 μmol/（g HA）, while non-quantitative when the complex concentyation is >40 μmol/（g HA）, in the medium of pH=7.0±0.2. The uptake increases significantly with the addition of Ca2+ ions. The ability to desorb the adsorped complex is in order of EDTMP>> DTPA > EDTA. Two adsorption modes of 153Sm-EDTMP on HA are suggested, i.e. （1） quantitative （when the amount of adsorbed complex is ≤ 40 μmol/（g HA））, and （2） less efficient （>40μmol/（g HA））.Non-quantitative adsorption is attributed to Coulomb repulsion while the complex amount is ranging from 40 to 80 μmol/（g HA）.  
        关键词：153Sm-EDTMP;Hydroxyapatite;Adsorption;Desorption   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：The principle of quadrature-hybrid used as an AM/PM converter is presented.The vector relation between signals at port A, B, C and D is illustrated. Application of this AM/PM converter in the beam position monitor at NSRL is described briefly.  
        关键词：Quadrature-hybrid;AM/PM converter;Beam position monitor   
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        <引用本文> <批量引用> 8413284 false
        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：The proton microprobe and micro-PIXE quantitative analysis technique have been used to determine the tyace elements composition and distribution in minerals such as olivine, orthopyroxene, clinopyroxene, spinel and garnet from Suoluoshu mantle peridotite from Shandong Province. The results show that clinopyroxene mainly concentrates incompatible elements （Sr, Y and Zr） while spinel concentrates almost all of the trace elements the proton microprobe can detect; and garnet concentrates very little trace elements. The study indicates that distribution of the trace elements in micron area of minerals is very heterogeneous. It is supposed that the heterogeneity results from the combined restraints of the solution infiltration effect and the existence of micrograined inclusions in the process of mantle metasomatism.  
        关键词：Mantle peridotite;Spinel-to-garnet phase transformation;Proton microprobe;Trace elements   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：The integrated target ion source is a key component of an on-line isotope separator. The paper shows how to convert a commercial standard Nielsen ion source to an on-line ion source. Some performance tests are described. The differences between two ion sources and the reasons for causing the difference are discussed. It is shown that the modified ion source can be used as an integrated target ion source due to its desirable discharging performance.  
        关键词：Nielsen ion source;Discharge chamber;Axial magnetic field   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：The iron content in hair and blood for 37 children athletes who were supplemented with 0, 8 and 16 mg Fe/d, respectively, in the form of ferrous gluconate-containing chocolate for 3 months was determined before and after the supplement by INAA, SRXRF and blood analysis. The experimental results indicated that after the supplement of the iron-fortified food, the ferritin level in blood of the male athletes attained to normal and the iron content in hair was increased with the increasing level of supplement, but not in direct proportion. Most of the female athletes had similar results. It is suggested that supplement of 8 mg Fe/d to a child athlete may be adequate.  
        关键词：Nuclear analysis techniques;Athletes;Iron-fortified food;Hair;Trace element.   
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        发布时间：2021-04-09
      • Wang Bihe
        Issue 4, (1996)
        摘要：comparative test for fast wear of various piston rings（N+ ion implanted, plated with SiNx and ordinary finished product） has been completed. The N+ ion implanted piston rings, among others, demonstrate the best wear resistance and the smallest change of elasticity, which indicates that N+ ion implantation is a fairly well method for improvement of wear resistance of piston rings. The mechanism of raising wear resistance by N+ ion implantation is also discussed.  
        关键词：Piston ring;N+ ion implantation;Wear resistance;Comparative test   
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        发布时间：2021-04-09
      • Issue 4, (1996)
        摘要：A newly developed coincidence measurement system used for （e,2e） experiments is described. It consists of a fast timing channel and four slow position channels. The five parameters acquired by the system are four position charge pulses from slow channels and a timing pulse from TAC. The He（e,2e） He+ 1s experiment has been carried out by using this system, and the coincidence time spectrum and binding energy spectrum were obtained.  
        关键词：e;2e) reaction;Coincidence measurement;Electron momentum spectroscopy   
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        发布时间：2021-04-09
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