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      • Jiazeng Hu,Guoming Chen,Zuyao Zhou,Congxin Ren,Jie Yang,Xinding Fu,Dezhang Zhu,Dexin Cao
        Vol. 10, Issue 9, (1987)
        摘要：Au sputtcring yield with Ar+ ions of 300—1200 eV is measured by backscattering. The backscattering spectra are treated by two methods (energy loss method and area method). The results show that Au sputtering yield measured by RBS is in agreement with G. K. Wehner's result by weight method. The relation between our experimental sputtering yield and ion energy is y∝E0.4. This energy relation gives a good agreement with P. Sigmund's theory when m=0.3.  
        关键词：Backscattering;low energy sputtering yield   
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        发布时间：2022-09-13
      • Zhenxia Wang,Zhenlan Tao,Liping Zheng,Chunchang Sun
        Vol. 10, Issue 9, (1987)
        摘要：In this paper we report results of isotopic fractionation δi (63Cu, 65Cu) in both elemental Cu and binary alloy Cu0.7Au0.3 during sputtering by Art ion (27keV). The present observations show that larger mass-dependent isotopic fractionation effects accompany the sputtering process: (1) For elemental Cu target, δi (63Cu, 65Cu)= (62 ± 27)‰, for binary alloy Cu0.7Au0.3 target, δi (63Cu, 65Cu)= (5.9±1.6)‰; (2) Angular distributions of isotopic fractionations δi (63Cu, 65Cu) are similar in both Cu and Cu0.7Au0.3, but we note that for alloy sample (CuAu) the δi (63Cu, 65Cu)<0 at θ (angle of ejection) <45°. These retsults indicate that sputtering produces isotope fractionation and that there is difference in both angular distributions of δf for Cu target and Cu0.7Au0.3 target.  
        关键词：Sputtering;fractionation   
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        发布时间：2022-09-13
      • Ge Jin,Yanming Yang
        Vol. 10, Issue 9, (1987)
        摘要：A multi-channel data acquisition and processing system for Mössbauer spectroscopy is described, which consists of an intelligent interface and a BC3-80 microcomputer.The system has eight data channels, each channel contains a counting circuit and a memory. A Z80-CPU is used as a main unit for control and access. The microcomputer is used for real-time displaying spectrum, saving the data to disk, printing data and data processing.The system is applicable to a high counting rate multi-wire proportional chamber. It can increase greatly the counting rate for measuring Mössbauer spectrum. The signals of each wire in the chamber go through a corresponding amplifier and a differential discriminator and are recorded by a corresponding data channel, the data of each channel is added by the microcomputer. In addition, we can use two channels to measure an absorption and a scattering spectrum at the same time and obtain the internal and the surface information of the sample simultaneously.  
        关键词：Mössbauer;data channel;Data acquisition   
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        发布时间：2022-09-13
      • Xunliang Ding,Zhonglie Wang,Yahong Qian
        Vol. 10, Issue 9, (1987)
        摘要：The oxygen concentration and depth profile in the Si-W multiplelayer samples were measured by using the 16O (α, α)16O resonance scattring at 3.042 MeV. The reaction between tungsten and silicon and the formed WSi2 by ion beam mixing were studied as a function. of the concentrations of oxygen impurity. It has been found that at a low oxygen content, hexagonal WSi2 was formed during the radiation of samples at 350℃ with As+. The silicide was transformed into tetragonal WSi2 at 700℃ annealing. At higher oxygen content, hexagonal WSi2 was not observed. The tetragonal WSi2 was formed at 950℃ annealing. The tungsten and silicon was mixed uniformly and the formed WSi2 films with larger grains have lower resistivities in the samples which contain lower oxygen content,  
        关键词：resonance scattering;oxygen impurity;Ion beam mixing;refractory metal silicide   
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        发布时间：2022-09-13
      • Guoqiao Jin
        Vol. 10, Issue 9, (1987)
        摘要：This paper achieved self-acquirement of initial values of matter-phase spectra and fullscreen keyed correction of fitted parameters. Many spectrum figures such as fitting, remanent, magnetic, paramagmetic and total spectra etc. can be output with high-distinguishability. The initial and fitted parameter values can be auto-conserved on disk. The Mössbauer spectrum analytic efficiency was heightened many times, The program was written in compiler basic language.  
        关键词：full screen;peak-position needle;keyed correction;fit technique   
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        发布时间：2022-09-13
      • Zhongyang Wang,Yinchun Liang,Xingying Yu,Zuliang Chen
        Vol. 10, Issue 9, (1987)
        摘要：The synthetic process of polyethylene cation exchange capillary via radiation grafting polystyrene by simultaneous irradiation with 60Co γ-ray source and sulfonation with concentration H2SO4 was studied. The effects of dose, dose rate, monomer concentration, solvents, temperature and crosslinking agents on the graft copolymerization of styrene with polyethylene capillary were illustrated. The relationship between the radiation grafting conditions and the properties of ion-exchange capillary were examined. A polyethylene cation exchange capillary with I. D. 0.8mm, length 20m, exchange capacity 0.7 Meq/g, 60% capacity in 10 s (flow rate 20ml/min) was prepared. No significant loss of capacity was found from this ion-exchange capillary after 200 adsorption/regeneration cycles.  
        关键词：polyethylene capillary;ion-exchange capillary;radiation induced;graft copolymerization   
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        发布时间：2022-09-13
      • Lizhen Zheng,Mingqian Wang
        Vol. 10, Issue 9, (1987)
        摘要：The energy responses of the native thermoluminescent dosimeter of LiF (Mg, Ti) and CaSO4 (Tm) in glass tube to 5.8—58.5keV photons are given and the low energy compensation of the thermoluminescent dosimeter of CaSO4 (Tm) in glass tube are discussed. Our experiment conditions for best energy compensation is composed of a 0.1mm thick copper and a 0.3mm thick tin with φ0.7mm apertures with total area occupies 10% of the surface. In this situation the energy responses for 12.2—58.5keV photons relative to 137Cs γ-rays are 1.00±0.48.  
        关键词：Thermoluminescent dosimeter;Energy response;energy compensate   
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        发布时间：2022-09-13
      • Minkang Teng,Chengwen Xu,Dexun Shen
        Vol. 10, Issue 9, (1987)
        摘要：The automatic data acquisition and processing technique for positron annihilation lifetime spectra and Doppler broadening spectra described in this paper is designed to facilitate the transfer of spectral data between the Canberra series 40 or series 35 MCA and IBM-PC/XT computer systems. The important features of the spectral data processing technique include display, calculations, spectrum and result storage/retrieval on disk, graphics and list of results.  
        关键词：Positron annihilation lifetime spectrum;MCA;serial interface;communication software   
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        发布时间：2022-09-13
      • Xueshi Chen,Jiabi Zhu,Kuanzhong Xie
        Vol. 10, Issue 9, (1987)
        摘要：A microprocessor MCA controled "rabbit system" has been set up. It can be widely used with its powerful functions in activation analyses and nuclear decay investigations.  
        关键词：microprocessor MCA;program controled;Ge (Li) detector   
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        发布时间：2022-09-13
      • Quanxun Song,Guangzhou Liang
        Vol. 10, Issue 9, (1987)
        摘要：The improvements are as follows: increasing the efficiency of the detector to 11%; reducing the measurement time by simultaneously measuring and irradiating the samples; installing an automatic device for changing the samples; improving the automatic control and the irradiation safe-guards. Now the detection limit for natural uranium is about 0.01ppm. The time for measuring one sample is less than one minute. It can determine six thousand samples per month. The cost of the analysis is more inexpensive  
        关键词：Delayed neutron;Uranium;improvement of the measurement device   
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        发布时间：2022-09-13
      • Zhixiang Xu
        Vol. 10, Issue 9, (1987)
        摘要：This paper describes results on table experiment about Penning ion source and establishes the dependence of discharge current, target current and other parametors with the sizes of the anode and magnetic field, magnet etc.; finally determines the best parameters.  
        关键词：Ion source;discharge current;target current;Neutron tube   
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        发布时间：2022-09-13
      • Guanghua Zhang
        Vol. 10, Issue 9, (1987)
        摘要：The principle and mechanism of a planetary target is presented. At present, the T-Ti target employed in neutron generators in the world can only be used on a ring shape zone because they turn around their axes and the velocity in the central region is near zero. In this design, the track which is formed by beam hitting is an abnormal cycloid that is not repeated. In this case, the central region of target has a larger velocity and full target surface can be used. So the lifetime of target is much longer.  
        关键词：planetary target;abnormal cycloid   
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        发布时间：2022-09-13
      • Lijiang He,Chenghua Wang,Dong Cai
        Vol. 10, Issue 9, (1987)
        摘要：Lyoluminescence (LL) is a useful technique for γ-ray dosimetry. It is recommended by IAEA for γ-ray high dose measurement on the irradiation process. Lyoluminescence dosimetry deals with the measurement of light emitted when a previously irradiated material (glutamine) is dissolved in a solvent. Investigation on the dependence of LL respone on quantity of glutamine and on volume of the solvent has been reported. The effect of temperature, oxidation and storage time on the lyoluminescence yield has been measured.  
        关键词：lyoluminescence;high dose dosimetry;irradiation process;Quality control   
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        发布时间：2022-09-13
      • Shiming Chen
        Vol. 10, Issue 9, (1987)
        摘要：N-AChRs of chicken brain (either from optic lobe or from the rest of brain) and skeletal muscle were extracted in presence of protease inhibitors. The receptor of brain was further purified to homogeneity (pI=5.4) by affinity chromatography. The kinetic properties for binding of [125I]-α-BTX to detergent-solubilized and purified receptors from optie lobe and detergent-solubilized receptor from skeletal muscle were studied. It was confirmed that they are nicotinic. The binding of α-BTX to AChR from optic lobe was consistent with a simple bimolecular reaction. In contrast, it was biphasic to the muscle AChR. Dissociation constants (KD) for AChR-[125I]-α-BTX complex from optic lobe and from muscle were 129 pM and 4 pM respectively at 25℃. The reaction of [125I]-α-BXT with AChR was inhibited by agonists or antagonists and the Ki and h values were determined by Hill plot analysis of the data.  
        关键词：nicotinic cholinergic receptor;[125I]-α-bungarotoxin;radioligand binding assay;binding kinetic   
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        发布时间：2022-09-13
      • Quansheng Li,Huiyang Zhao,Aina Yuan,Gang Huang,Jiasen Yan,Junrong Xu
        Vol. 10, Issue 9, (1987)
        摘要：An improved software package used in FT-1908 γ-probe for cardiac function studies is presented. The microcomputer adopted is TRS-80. Using this new software the analytical system is much more suitable for clinical diagnosis  
        关键词：γ-probe for cardiac;computer software;nuclear stethoscope   
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        发布时间：2022-09-13
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