最新刊期
      卷 0 ， 期 0 ， 2020
      • Jiachao Chen,Meizhen Wu,Jiyu Tang,Youmei Sun,Zhiguang Wang
        Vol. 13, Issue 10, (1990)
        摘要：The nitrogen depth profile and concentration are measured by means of 14N (d,α1) 12C reaction. With a standard sample Si3N4 the depth resolution at the surface region is determined to be 48nm. By using this method, the nitrogen depth profile and retained dose are studied for pure Fe and GCr15 steel implanted by N+ at different implantation temperatures.  
        关键词：Depth resolution;Implantation temperature;depth profile;Retained dose   
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        发布时间：2022-08-16
      • Ningkang Huang,Zhirong Feng
        Vol. 13, Issue 10, (1990)
        摘要：The specimens of chromium steel were deposited with Ta of about 50 nm by magnetron sputtering and bombarded by 200keV Xe ions. Using the three sweep potentio-kinetic polarization technique the corrosion behaviours of these specimens, in 1 mol/1 H2SO4, 0.5mol/l H2SO4 and 0.1mol/1 NaCl solutions respectively, were measured. The results, combined with SEM-EDAX analysis, show that tantalum ion mixing can evidently improve the corrosion resistance of chromium steel.  
        关键词：Ion beam mixing;Corrosion   
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        发布时间：2022-08-16
      • Changshi Liu,Qinzhi Wu,Lingshan Zhang
        Vol. 13, Issue 10, (1990)
        摘要：The Si-SiO2 irradiated with 60Co are analyzed by using the depth-dissection techniques of XPS and AES. The results show that there exists an interface and that when the sample is irradiated the interface extends towards the surface of SiO2 and the centre of the interface moves towards the surface of SiO2. The extension and movement are dependent on the condition of irradiation. An explanation for the experimental results is given using the Bond Strain Gradient Model.  
        关键词：Si-SiO2;XPS;AES;Interface;Bias field   
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        发布时间：2022-08-16
      • Andong Liu,Zhongliang Tong,Zhongwei Zhao,Hongchun Gu,Huadan Hu,Zhonghe Hao,Yingxin Song,Wanhua Sun,Shaojie Di,Fengmei Li,Wenxue Wang,Ming Zhai
        Vol. 13, Issue 10, (1990)
        摘要：In this paper was reported a pulse radiolysis system built up in Peijing Radiation Center. Using a 5 MeV scanning linac as the pulsed radiation source, the system could provide a 2 microsccond width and 200 mA single pulse. The non-interrupt beam monitor was used to monitor the beam current. A kinetic spectrophotometer was chosen to detect the transient optical absorption. A DCM-80A single board computer system with a transient signal recording board was used to record and process the signal and to control the time sequencing. Several pulse radiolysis experiments were carried out in aqueous system and positive results were obtained.  
        关键词：pulse radiolysis;Kinetic spectrophotometer;Intermediate products;Transient signal recorder   
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        发布时间：2022-08-16
      • Nianbao Zhang,Shugang Sheng,Fuzeng Yao,Binghua Xie,Meiying Zhou,Rongzhen Cao,Einwei Yu,Desong Zhong,Ruifang Qin,Guoping Wang
        Vol. 13, Issue 10, (1990)
        摘要：In this paper a new technique is reported for tritium labelling of proteins, peptides and other nonvolatile organic compounds. A tritium ion beam is accelerated to bombard solid sample target for producing tritium exchange with hydrogen. The tritium labelling method has been applied to tritiated soybean trypsin inhibitor, ribonuclease A, elastin, pachyman and others totalled 11. After purifying by dialysis, ion exchange chromatography and gel filtration, the tritiated proteins and polysaccharide were obtained with specific activity over 37GBq/mmol, without decomposition and with biological activity well preserved. By amino acid analysis of tritiated protein it was shown that the relative specific radioactivities for His., Tyr. and Phe. residues were higher while those for Val., Ile. and Ser. residues were lower.  
        关键词：Ion beam tritium labelling technique;H-T exchange;Tritiated proteins;Tritiated peptides   
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        发布时间：2022-08-16
      • Shiming Wu,Minqian Li,Kanglong Sheng,Changshi Liu,Jiahua Zhang
        Vol. 13, Issue 10, (1990)
        摘要：On the basis of a fully automatic PIXE analysis system, a PIXE-PIGE analysis system was established. The detectable element range can be extended to lower Z region. The internal-standard method was used to measure some IAEA and NBS standard reference materials and botaincal samples.  
        关键词：Proton induced X-ray emission (PIXE);Nuclear reaction analysis(NRA);Trace element analysis   
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        发布时间：2022-08-16
      • Jianguo Ma,Zhifang Chai,Xueying Mao,Shulan Ma,Zhixiang Mao,Peilan Yan
        Vol. 13, Issue 10, (1990)
        摘要：A preliminary investigation of silt motion in Shantou Harbor region has been made by using neutron activation analysis of natural activable stable isotopes in silt. More than 20 elements in suspending and bed silt at different sites were determined. Data analysis and computer-based fitting calculation indicated that all of the suspending silt samples analyzed were of the same origin, i. e. Xinjinxi River outlet and about 37% of the bed silt at the Wailanjiangsha channel is composed of the deposit of suspending silt.  
        关键词：Activation analysis;Tracer technique;Stable isotope;Silt motion   
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        发布时间：2022-08-16
      • Renkang Cai
        Vol. 13, Issue 10, (1990)
        摘要：The transformation between ion beams of axially-symmetrical shape and strip thape is discussed in this paper. The deflecting magnets are used as examples to illustrate its application.  
        关键词：Ion beam;Beam optics   
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        发布时间：2022-08-16
      • Jin Tan
        Vol. 13, Issue 10, (1990)
        摘要：In this paper is introduced a method of using numerical analysis to solve calibration equations for nucleonic densimeters. Some problems such as equation simplification, choosing initial value of iterative function, convergency of iterative function and the how chart for computer program have been discussed. This method provides a simpler, more accurate and reliable way to calibrate densimeter on the spot.  
        关键词：Numerical analysis;Calibration equation   
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        发布时间：2022-08-16
      • Zhixin Zhou
        Vol. 13, Issue 10, (1990)
        摘要：The β-ray backscattering coefficient for absorbed dose in the medium surface is defined. A method for measuring β-ray backscattring coefficient by ultrathin TLD is described. Among those media measured, the backscattering coefficients of polyethylene and paper were the least. Some regularity and applications of the backscattering coefficients were discussed.  
        关键词：Dose;TLD;β particle;Backscattering   
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        发布时间：2022-08-16
      • Pinfang Li,Guangzao Li,Maoliang Wu
        Vol. 13, Issue 10, (1990)
        摘要：The results of actual measurement and estimation of air absorbed dose rate inside and outside enclosing wall of a 60Co-γ field were presented. The changes of scattered absorbed dose rate in various conditions were discussed, and the estimated formulas for scattered air-absorbed dose rate were given. It was shown that the estimated values were in agreement with the measured ones.  
        关键词：60Co-γ field;Scattered air-absorbed dose rate   
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        发布时间：2022-08-16
      • Cailian Wang,Mei Shen,Gang Xu,Kongnan Zhao,Qiufang Chen
        Vol. 13, Issue 10, (1990)
        摘要：After dormant seeds of 20 barley varieties were irradiated with 137Cs γ-rays, the correlation of cell-nucleus volume and radiosensitivity were studied. The results showed that the dose-effect of cell-nucleus volume could be fitted by a linear regression equation y=A+Bx, and the dose-effect of seedling growth inhibition be fitted by equation F (D) =1- (1-e-α1D) N. No clear difference was found in dose-effect of nucleus volume among different types of barley. The value of nucleus volume was significantly correlated with that for nucleus volume D50 among varieties (r=-0.8828**) . There was no obvious correlation among the D50 values for nucleus volume and for seedling growth inhibition.  
        关键词：γ-irradiation;Nucleus volume;Seedling growth;Dose effects;Barley   
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        发布时间：2022-08-16
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