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      卷 0 ， 期 0 ， 2020
      • Haiyang Geng,Anmin Guan,Chenglu Lin,Bo Yu
        Vol. 12, Issue 4, (1989)
        摘要：1、2MeV double-charged phosphorous ions implantation of silicon using different discharge materials in the ion source is described. Results show that 1.2 MeV P+ implantation can facilitate the formation of buried layers which are suitable for the fabrication of a retrograde N well structure in CMOS VLSI at a 600 keV ion-implantation installation.  
        关键词：Double-charged ion;Ion implantation;contamination   
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        发布时间：2022-08-16
      • Lijia Yang,Yili Liu,Hengde Li
        Vol. 12, Issue 4, (1989)
        摘要：Platinum films about 55nm thick were deposited onto Si (111) substrates. The samples were implanted with 300keV As+ ions at room temperature. The oriented growth of PtSi was observed from the results of X-ray diffraction analysis. The preferred orientation of PtSi induced by ion irradiation and post-annealing is (101) . A possible growth mechanism of the interfacial PtSi was proposed on basis of the Bravais crystal theory and lattice matching condition.In addition, the oriented growth of PtSi was found to be affected by the orientation of Si substrates. Platinum silicide grown on Si (100) has no obvious orientation.  
        关键词：Ion beam;Preferred orientation;PtSi   
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        发布时间：2022-08-16
      • Qinzhi Wu,Changshi Liu,Lingshan Zhang,Mei Han,Fang Wang,Bo Liu,Yuanfu Zhao
        Vol. 12, Issue 4, (1989)
        摘要：The oxide trapped charge ∆Dot,the Si-SiO2 interfacial state density ∆Dit and the energy level distribution of the density introduced in polysilicon gate MOS samples with n (100) silicon substrate after 60Co γ-ray irradiation are studied. Experimental evidence indicates that the effect of irradiation strongly depends on the bias field. When samples are irradiated at a+1MV/cm bias field, both the oxide trapped charge and the interfacial state density present a peak. The midgap state density is proportional to the density of holes trapped. While the interfacial state density of polysilicon gate MOS samples in the forbidden band obeys the U-type distribution, a broad peak of interfacial state density with definite energy level (Eс-Es=0.41-0.5eV) appears in the A1-gate n substrate MOS samples after irradiation.  
        关键词：Oxide trapped charge;Interfacial state;Interface densities;Irradiation bias;Dose   
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        发布时间：2022-08-16
      • Zengliang Yu
        Vol. 12, Issue 4, (1989)
        摘要：The target power is an essential parameter for the extracting beam in the heavy current ion source test. Generally, the test device of the ion source is equipped with a calorimeter to measure ion beam power. In this paper the principle, measurement method and analysis of results for adiabatic calorimeters are described.  
        关键词：Beam power;Adiabatic calorimeter;Backward extrapolation   
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        发布时间：2022-08-16
      • 秀芳 张,乃飞 高,劲军 文,强 王
        Vol. 12, Issue 4, (1989)
        摘要：测量了Cr12MoV钢磨料磨损过程中所产生的磨屑及磨损表面的穆斯堡尔谱. 分析表明, 该材料的磨损率及其相结构的改变与它的淬火温度和它相对于磨料的滑动速度有关, 而且磨屑的相结构和磨损表面的不同.  
        关键词：穆斯堡尔谱学;磨损;Cr12MoV钢   
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        发布时间：2022-08-16
      • Ting Lu
        Vol. 12, Issue 4, (1989)
        摘要：Positron-lifetime and Doppler-broadening measurements were performed at room temperature on polycrystalline Ni3A1 alloys. The content of aluminum in Ni3A1 is 24%, 25% and 26% respectively. Fifteen Ni3A1 samples, containing 0, 100, 300, 500 and 1000wt. ppm boron respectively, were measured. The positron measurement is carried out for the first time for six samples among them. The results are discrepant with Dasgupta's results in some aspects and the possible reason was discussed.  
        关键词：Positron annihilation;Lifetime measurement;Doppler broadening measurement;Alloy;Ni3A1   
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        发布时间：2022-08-16
      • Jitang Guo
        Vol. 12, Issue 4, (1989)
        摘要：The principle, instruments and test results to measure concrete surface density by γ-rаy backscattering are described. A radioactive source 137Cs 2.59 MBq was used, the penetration depth in concrete is about 10 cm, and the measuring precision is 0.1g/cm3. The penetration area and depth in concrete, the calibration method and the measurement sensitivity are discussed. A suggestion for in-situ calibration with aluminium as standard specimen is put forward. Finally, some successful examples of in-situ practice are introduced.  
        关键词：γ-ray backscattering;Compton scattering;Density;Concrete;Nondestructive testing (NDT)   
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        发布时间：2022-08-16
      • Anmin Guan,Yilin Sun,Haiyang Geng,Jun Li,Xinyuan Jiang
        Vol. 12, Issue 4, (1989)
        摘要：Application of the 820 ion source on the 600 kV heavy ion implanter is described. More than 20 ion species extracted from the ion source have been applied to the research of material modification of semiconductors, metals and insulaters. Ion beam contamination is also discussed.  
        关键词：Ion source;High energy ion implanter;Ion species   
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        发布时间：2022-08-16
      • Benxiu Jiang,Guangqing Yang
        Vol. 12, Issue 4, (1989)
        摘要：This article introduces a method for determining hydrogeological parameters such as the field capacity in zone of aeration and the specific yield in aquifer where water content is varied.To calculate the above parameters, water content in soil and its variety were measured by a neutron probe. This method is simple and the results are close to those obtained using other methods.  
        关键词：Field capacity;Specific yield;Neutron meter   
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        发布时间：2022-08-16
      • Yexiang Li,Zhengyu Xiang,Haishan Xu,Yunshan Mu,Shiming Wang
        Vol. 12, Issue 4, (1989)
        摘要：The fast neutron-capture cross sections of elemental neodymium and samarium we??-measured in energy range of 0.34-1.68MeV relative to the standard capture cross section of gold. The T (p,n) 3He reaction was used as neutron source and the primary proton beam was accelerated, pulsed and bunched by 2.5 MeV Van be Graaff. A large liquid scintillation detector (680 liter) and time-of-flight technique were used.  
        关键词：Nd;Sm;Capture cross section   
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        发布时间：2022-08-16
      • Dongzhu Zheng,Keming Zhan
        Vol. 12, Issue 4, (1989)
        摘要：In the preparation of high specific activity deoxyadenosine 5'- [α-35S] thiotriphosphate, the structure of deoxyadenosine 5'-α-thiotriphosphate (5'-dATPαS) was determined by 51P-NMR. In the proton coupled 31P NMR spectrum, there was a triplet of doublets (JPα-β=27Hz, JPαH5=6Hz) at 43.1ppm. Therefore this compound was recognized to be 5'-isomer. The 31P-NMR spectrum showed that it exists in either SP or RP configuration.  
        关键词：31P-NMR;Deoxyadenosine 5'-α (35S) -thiotriphosphate   
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        发布时间：2022-08-16
      • Xiaofeng Wu,Yurong Zhang,Longxing Zhang,Agen Zhang
        Vol. 12, Issue 4, (1989)
        摘要：The XRF method was used to analyse nine kinds of trace elements in hair samples for three groups of people. While the information on long-lived people is used to explore the secret of long life, the work on hypertensives helps understand the effect of some trace elements on the disease. The normal values of trace elements for university students have been also set up.  
        关键词：X-ray fluorescence analysis;Scalp hair;Trace element   
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        发布时间：2022-08-16
      • Baoyuan Lin,Yuan Ren,Weidi Hu,Guoxue Zhu,Jian Guo,Xiulan Hu,Airong Fu,Yusheng Wang,Jia Mei
        Vol. 12, Issue 4, (1989)
        摘要：A movable diaphragm tank for storage of radioactive waste liquor is described. Comparison between movable and nonmovable tanks was made. The diffusion rate of radioactive molecules is slow in the former and its working efficiency is increased to 1.27-2.1 times. The difference is significant (p<0.001) and the correlation is good (r=0.9793-0.9966) .  
        关键词：Medical radionuclides;Waste processing;Diffusion rate   
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        发布时间：2022-08-16
      • Keyun Chen,A. L. Epstein,F.M. Chen,D.C.P. Chen,K.H. Lee,G.L. Hung,J.Y. Hong,K.Y. Hong,S. Ballard,D. Payne,M.E. Siegel,J. Halls
        Vol. 12, Issue 4, (1989)
        摘要：The binding of 131I-Lym-2 MoAb to the ARH-77 and CEM cells were 82.80±0.57%and 0.44±0.14% respectively. The daily imaging of the experimental group (9 nude mice) was made to obtain the kinetics data. The experimental and control groups mice were sacrificed at 144 hours after injection for the biodistribution (% Dose/g) data. The uptake of the experimental group was 16.88±12.64 in tumour, and 0.72±0.56 in muscle. 131I-Lym-2 MoAb was shown to be a potential agent for radioimmunoassay, radioimmunoimaging and radioimmunotherapy of B-cell lymphoma.  
        关键词：131I-Lym-2 MoAb;Living cells binding assay;Target cells;Nontarget cells;Kinetics Radioimmunoimaging   
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        发布时间：2022-08-16
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