最新刊期
      卷 0 ， 期 0 ， 2020
      • Qiong Su,Yamin Gao
        Vol. 12, Issue 2, (1989)
        摘要：A mathematical model is given to describe the relation between the efficiency function of quantitative analysis for gamma-ray spectra and height of samples, which are put into a certain cylindric container. It not only simplifies the effeciency calibration of samples, but facilitates the data processing by computers automatically also.  
        关键词：Gamma-ray spectrometer;Efficiency calibration;Mathematical model   
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        发布时间：2022-08-16
      • Xiliang Gu,Mu Gu,Detang Shi,Jinghua Qian,Yude Hu,Jiahui Gu,Jiaqi Tian,Junshan Xu,Zhendi Guo,Fujia Yang
        Vol. 12, Issue 2, (1989)
        摘要：The resonance γ absorption method is discussed in this paper. Some experimental results about the short lifetime of high excited nuclear states for 28Si, 24Mg and 40Ca nuclei with the method have been introduced.  
        关键词：Lifetime of nuclear state;Resonance γ absorption method;Fine structure   
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        发布时间：2022-08-16
      • Zhenxia Wang,Liping Zheng,Zhenlan Tao,Jisheng Pan
        Vol. 12, Issue 2, (1989)
        摘要：Angular distributions of sputtered Fe and W atoms from Fe-W alloy (25 wt%) under 27 keV Ar ion bombardment have been measured by Rutherford backscattering and a collector, on which the sputtered atoms with different ejection angle θ from the alloy surface deposit. The results indicate that angular distributions of both Fe atoms and W atoms are over-cosine shape and that the sputtered composition ratio Nw/NFe is linked with the ejection angle θ. Comparing this work with our previous work on Cu-Au and Ti-Ni alloy systems implies that the mechanism of the preferential sputtering teems to associate with the mass ratio of components. A simple model has been used and it is found that the target surface topography may be an important factor to cause the variation of angular distribution of sputtered atoms.  
        关键词：Angular distribution;Preferential sputtering;Surface topography   
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        发布时间：2022-08-16
      • Guoming Chen,Junzo Ishikawa,Toshinori Takagi
        Vol. 12, Issue 2, (1989)
        摘要：An impregnated-electrode-type liquid metal ion source has been developed in which a sintered porous tungsten tip is used. The purpose of the present investigatin is to fabricate eutectic alloys which can be used in impregnated-electrode-type liquid metal ion source. Si, Ge and Sb ions have been obtained and basic parameters of the ion source such as current-voltage characteristics, mass spectra and lifetime have been measured.  
        关键词：Ion source;Liquid metal;Impregnated-electrode-type   
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        发布时间：2022-08-16
      • Renpo Wu,Minhua Liu,Shuyu An,Qingzhi Wang
        Vol. 12, Issue 2, (1989)
        摘要：A technique for determining 14C in air by the solid suspension method with liquid scintillation counter is presented. In this paper, conditions of the "Toluene-Triton X-100-Water" system as the solid suspension, methods of sample preparation and the effect of temperature etc., are discussed. The preliminary results of determinations are also given.  
        关键词：14C in air;CaCO3 powder;Solid suspension;Liquid scintillation determination   
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        发布时间：2022-08-16
      • Xiaowei Yan,Zhixin Zhou
        Vol. 12, Issue 2, (1989)
        摘要：A survey of external exposure from natural environmental radiation in Shanghai from 1985 to 1987 was made by thermoluminescence dosimeter. The annual population-weighted external exposure of residents and the area weighted external exposure in Shanghai area were 104.8 (×0.258µC/kg) and 99.2 (×0.258µC/kg) respectively.A comparison between the survey of annual integral exposure in Shanghai during this period and the survey of radiation dose in whole country from 1982 to 1984 was also made.  
        关键词：Natural environmental radiation;Integral external exposure Survey;Thermoluminescence dosimeter;Shanghai   
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        发布时间：2022-08-16
      • Huansheng Cheng
        Vol. 12, Issue 2, (1989)
        摘要：A simple charge pile-up rejector is described. It can be used in ion beam analysis experiments to neutralize the ion charge pile-up on the isolation target. A typical Rutherford backscattering spectrum from white porcelain glaze on a dish is presented.  
        关键词：ion beam analysis;Isolation sample;Charge pile-up rejector   
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        发布时间：2022-08-16
      • Wenzhi Li,Yu Wang,Fuzhai Cui,Hengde Li
        Vol. 12, Issue 2, (1989)
        摘要：A computer program to calculate atomic concentrations in the surface layer of multi-element solids from experimental RBS spectra is presented. The basic features of the computational model, its function and application scope are discussed in detail. The analysed sample is modeled as a series of layers each with the same thickness and the calculations proceed layer by layer from the surface, so that the concentration and the depth profile of each element can be obtained. The program is in BASIC and it is operated on the IBM microcomputer in the manner of man-computer conversation. A. few of simple but quite reliable routines are available.  
        关键词：RBS;Concentration-depth profile;Computer program   
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        发布时间：2022-08-16
      • Zhihai Wang,Yangmei Fan,Zhenxi Xiao
        Vol. 12, Issue 2, (1989)
        摘要：A method for the efficiency calibration of a Ge (Li) detector at short source-to-detector distance is described. It combines the multi-gamma-ray source calibration method with the distance variation method with several single-gamma-ray sources. The full-energy peak relative efficiency, full-energy peak absolute efficiency and total efficiency have been determined with an error of 1.5%, 1.6% and 4.1% respectively at the energy ranging from 120 to 1115 keV. Therefore the spectroscopy can be used effectively to measure weak gamma-ray source which may emit cascading photons. With the method, the full-energy peak relative efficiency can be calibrated using an unknown activity gamma-ray source.  
        关键词：Ge (Li);Efficiency calibration;Short source -to-detector geometry   
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        发布时间：2022-08-16
      • Ronghui Xu,Yuanxiu Ge,Feng Ma
        Vol. 12, Issue 2, (1989)
        摘要：The software and hardware construction for an on-line positron annihilation lifetime spectrometer and the prime process of setting it have been described. As a versatile tool in the field of nuclear spectroscopy, the system can also be used for other purposes.  
        关键词：Positron annihilation life-time spectrometer;On-line;Data acquisition and analysis system   
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        发布时间：2022-08-16
      • Xingzhong Liang,Qingyang Li,Dianshu Li
        Vol. 12, Issue 2, (1989)
        摘要：In this paper the conversion from the specialized unit of α-track into the legal metrological unit is described. A circulative method for measuring the transform coefficient is discussed. An experiment about the transform coefficient on a uranium deposit has made.  
        关键词：Legal metrological unit;Transform coefficient;Graduated cup   
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        发布时间：2022-08-16
      • ziqing Ding,Xing Wu,Qilong Wang,Liguo Ma,Shunshou Wang,Jinrong Wang,Zhonglin Gao,Hefeng Yang
        Vol. 12, Issue 2, (1989)
        摘要：Investigation was made on the coloring of glass irradiated by γ-ray. The colour change of γ-irradiated glass was measured by using optical absorption. The coloring mechanism was preliminarily discussed.  
        关键词：γ-ray irradiation;Coloured glass;Absorption spectra   
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        发布时间：2022-08-16
      • Yaode Wan,Jiazhi Liu,Jiahong Xu
        Vol. 12, Issue 2, (1989)
        摘要：In this paper, the preventive function of 6,7-dimethoxycoumarin for whole-body gamma-irradiated rats has been reported.By giving ip 40—60 mg/kg to rats once 7—15 min before an exposure of 6—11 Gy, the percentage of survival of 30 days in haemopoitic type death was raised to 28.5%; the average protection coefficient was 1.940±0.8; DRF (dose reduce factor) was 1.149 for non-inbreed line rats; and the body, spleen and thymus weights were all increased. The antiradiation effect was found to be better when the drug was given (ip. or po.) 1/4—1 hour before an exposure. The variation of drug dosage (ip. 10—60 mg/kg) had little effect on the antiradiation function. The preventive effect of 6,7-dimethoxycoumarin seemed poor for rats with the gastrointestinal type acute radiation sickness.  
        关键词：6,7-dimethoxycoumarin;Exposure;Preventive effect;Dose reduce factor;Time effect relationship;Dose effect relationship   
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        发布时间：2022-08-16
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