最新刊期
      卷 0 ， 期 0 ， 2020
      • BAI Erjun
        Issue 9, (1998)
        摘要：Ultra-pure germanium polycrystalline material with a net impurity concentration of 5 ×1010/cm3 （atoms） has been prepared by the zone refining mathod. All raw materials, reagents and facilities used in the preparation are made in China. The involved techniques are described.  
        关键词：Ultra- pure germanium;Zone melting;Zone refining;Net impurity concentration   
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        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：An automatically controlled apparatus of target chamber was made to measure spectra of the excited atoms and lifetime of the excited levels. The hardware is composed of nine parts including a computer and a step-motor, while the software consists of three branch programs. The maximum movable distance of target position is 65cm with a step-length of 8.3 u m and a precision of ±18 u m per 2mm. On account of simple structure and double, protection, the apparatus exhibits flexibility and reliability in years service.  
        关键词：Target chamber;Automatic control;Atomic spectra;Level lifetime   
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        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：The angular distribution of emitted neutrons with energy greater than 6MeV in the 75MeV/u 16O ion experimental area was measured by the activation method of A1 threshold detector. The obtained result is useful to the radiation protection design for the heavy ion cancer therapy. The angular distribution is found strongly peaked in the forward direction.  
        关键词：Threshold detector;Neutron activation method;Angular distribution   
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        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：A simple filter, which is composed of transmission lines and c an reject interference is introduced. Its working principle , characteristics and some applications in the National Synchrotron Radiation Laboratory（NSRL） are described.  
        关键词：Transmission line;Filter   
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        <引用本文> <批量引用> 8417376 false
        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：Single crystals of sapphire （α-Al2O3） implanted with 100keV, 6×1016cm-2 （In+） or 360keV, 1×1016cm2 （In+） have been studied. The implantation was carried out at room temperature but the annealing was performed isothermally in Ar or air atmosphere at temperature in the range from 600℃ to 1100℃ The Rutherford backscattering spectrometry and channeling of 2.4MeV He+ were used to observe the depth distribution of lattice damage and implants. The microhardness and resistivity of the implanted layer were investigated by means of the depth-sensing low-load indentation technique and the electrical conductivity measurement, respectively. Results on the structural changes are correlated with the measured changes of physical properties.  
        关键词：Ion implantation;Sapphire;Lattice damage;Surface modification   
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        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：The formation of β-SiC buried layers in p-type Si by ion beam methods is reported and a comparison of the results obtained under different experimental conditions is made. The preparation of amorphous SiC thin films by IBED i. presented and the enhanced deposition of Xe. is found superior to that of Ar. . The work of synthesizing hydrogenated amorphous SiC films by RIBS and RIBAD is described with a discussion on the dependence of some physical parameters on the partial pressure ratio pcH4/PAr. Finally given is a brief introduction to a high quality a - SiCiH film which is prepared by PE CVD and can exhibit green luminescence at room temperature.  
        关键词：Ion beam enhanced deposition;Reactive ion beam sputtering;Reactive ion beam assisted deposition;Plasma-enhanced chemical vapour deposition   
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        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：A cylindrical flowing tissue equivalent proportional counter was made and adjusted. The tissue equivalent gas providing system and the electronic system designed for the CFTEPC were described. The microdosimetric spectra of α particles from 239Pu in TE and CH4 gases were measured.  
        关键词：Tissue equivalent proportional counter;Microdosimetric spectra;Energy loss spectra;239Pu;α particles   
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        <引用本文> <批量引用> 8417192 false
        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：The pMOS FETs with thick oxide layer were irradiated with transient X-rays or intensive pulsed low energy electron beam, and the radiation effects were investigated by continuous measurement of the threshold voltage. The experimental . results were interpreted by means of the irradiation-induced oxide traps and interface traps in MOS structure, and the equivalent diode circuits of pMOS FETs under transient irradiation.  
        关键词：pMOS FETs;Transient irradiation;Threshold voltage shift   
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        <引用本文> <批量引用> 8417208 false
        发布时间：2021-04-09
      • CHEN Jie
        Issue 9, (1998)
        摘要：以电子束和６０Ｃｏγ射线为辐射源，对聚丙烯纤维分别在空气和氮气氛下进行预辐照，然后将样品置于丙烯酸水溶液体系中进行接枝反应。研究了吸收剂量、反应温度、反应时间、丙烯酸浓度等对接枝率的影响，还研究了硫酸和硫酸亚铁等添加剂以及预辐照样品在室温下的存放时间等对接枝率的影响。比较了两种不同辐射源在预辐射接枝中的差别。  
        关键词：辐射接枝;丙烯酸;聚丙烯纤维;硫酸亚铁;硫酸   
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        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：对凝聚法和分散法制备１８８Ｒｅ－硫化铼混悬液的条件进行了比较。条件试验结果表明。凝聚法的最佳条件为Ｎａ２Ｓ２Ｏ３和ＫＲｅＯ４的摩尔比３５：１．反应时间７─８ｍｉｎ：而分散法分别为７０：１和３０ｍｉｎ。随着超声时间的加长，硫化铼的颗粒逐渐变小。从而得出结论：凝聚法虽然比较简单，但标记率不高（约７０％），颗粒小。稳定性差；而分散法的标记率大于９６％，颗粒较大，且７２ｈ内均十分稳定。  
        关键词：188Re－硫化铼;混悬液;凝聚法;分散法   
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        <引用本文> <批量引用> 8417249 false
        发布时间：2021-04-09
      • XIAO Jianmin
        Issue 9, (1998)
        摘要：The designing scheme of a γ ray ICT system by using Compton back- scattering is put forward. The technical norms, detector system, γradioactive source, mechanical scanning equipment, and data acquisition and image reconstruction principle of this ICT are described.  
        关键词：Industrial Computerized Tomography;Compton back- scattering;Designing scheme;Nondestructive test   
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        <引用本文> <批量引用> 8417510 false
        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：评述了ＨＬＳ储存环高频腔的性能；根据高流强运行时稳定性的要求，提出了一种新的高频腔结构；通过计算比较。确定了腔的结构尺寸、设计参数及高次模特性等；并与原有腔的参数进行了比较。  
        关键词：高频腔;谐振频率;分路阻抗;品质因数;高次模   
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        <引用本文> <批量引用> 8417264 false
        发布时间：2021-04-09
      • Issue 9, (1998)
        摘要：With the aid of a special program of RISO TL- OSL, the automation of pre- dose measurements becomes possible, and makes the operation more efficient and convenient than the usual manual procedure. The results of dating young pottery samples are compatible with their age, suggesting that the pre- dose technique is better than the additive- dose method for authentication of pottery younger than 1000 years.  
        关键词：Pre- dose method;Pottery;Dating   
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        <引用本文> <批量引用> 8417276 false
        发布时间：2021-04-09
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