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      • Xianzhou Zeng,Guilin Liu,Guanghua Zhu
        Vol. 11, Issue 5, (1988)
        摘要：A report is presented on the Fourth International Conference on Particle-induced X-ray Emission (PIXE) and Its Analytical Applications held on June 9-13, 1986 at Tallahassee, Florida of USA. As an important and fairly mature means of analysis, PIXE has been exploiting widely in environmental science, biology, medicine, materials science, geology, archaeology and other fields. At the same time, the methodology and techniques of PIXE itself are improving.  
        关键词：particle-induced X-ray emission (PIXE);the 4th International Conference on PIXE   
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        发布时间：2022-08-16
      • Miangong Shi,Baifang Yang,Zengxue Jiang,Shizhuo Hao,Xiaolan Lei
        Vol. 11, Issue 5, (1988)
        摘要：In this paper, the collision mechanism and the production of negative ions by fast molecular ions traversing solid foils are described. The experimental results of the production of negative ions by molecular ions H2+, D2+ of various energy traversing thin carbon foils are presented. And the production of negative ions by molecular ions is compared with that by atomic ions. The results are discussed and analysed qualitatively.  
        关键词：fast molecular ions;collision mechanism;Negative ions   
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        发布时间：2022-08-16
      • Chuanshan Wang,Muyao Zhou,Lu Zhang,Kuanzhong Xie
        Vol. 11, Issue 5, (1988)
        摘要：The work is devoted to the measurement of isomeric cross section ratio in 45Sc (n, 2n) 44g+mSc induced by 14.6 MeV neutron with the activation method. Considering the statistical model with preequilibrium mechanism, we have computed the isomeric cross section ratio of the nuclei with EPRIR program, compiled by ourselves.By comparison of the experimental results with the theory, the spin cut-off parameter and the contribution of preequilibrium mechanism have been determined.  
        关键词：isomeric cross section ratio;45Sc;statistics preequilibrium;activation method   
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        发布时间：2022-08-16
      • Wanhui Zheng,Jiahui Gu,Jiabi Zhu,Gongqing Wang
        Vol. 11, Issue 5, (1988)
        摘要：The decay of 61Cu nucleus has been investigated with Ge (Li) and HPGe detector, semiconductor electron spectrometer and Ge (Li) -NaI γ-γ coincidence spectrometer. 35 γ rays from 12 excited levels have been found. The single and coincidence spectra show that 545 keV, 1019 keV γ rays and 1019 keV energy level are wrong which appear in the 61Cu decay scheme carried in «Table of isotopes» (the 7th edition 1978). The half-life time of 61Cu nucleus and the internal conversion coefficient for 67 keV γ-transition are found to be T1/2=207.7±1.6min and α=0.12±0.01 respectively and then a decay scheme is proposed. In this paper we pay more attention to discussing the energy levels of 1014, 1019 and 1997 keV as well as some weak γ rays.  
        关键词：Decay scheme;intensity balance;internal conversion electron   
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        发布时间：2022-08-16
      • Haochang Pan,Zhenlan Tao,Liping Zheng,Dcxin Cao,Hengshan Zhang,Ahu Zhang,Zuyao Zhou,Wei Zhou
        Vol. 11, Issue 5, (1988)
        摘要：The experimental method is discribed for measuring angular distributions of sputtered particles using a sputtered particle collector and Rutherford backscattering analysis. The angular distributions are given for 100keV Ar+ions sputtering of Ag at incident angles of 0°, 30°, 50° and 80°. The angular distributions have large deviations from the cosine distribution and show an anisotropy with a preferred emission in forward direction with respect to the beam. The differential sputtering yield increases rapidly with increasing angle of incidence. The total sputtering yield calculated from the angular distribution for 50 keV Ar+ sputtering of Ag is 16.8±2.4 atoms/ion and compared with theoretical values. Finally, the results are discussed qualitatively.  
        关键词：Sputtering;sputtering angular distribution   
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        发布时间：2022-08-16
      • Huaian Zhu,Yulan Jiang,Xilin Yin,Peiying Yu,Pinjie Luo
        Vol. 11, Issue 5, (1988)
        摘要：NH-A neutron earth base moisture gage is an accurate instrument which can measure earth moisture rapidly and non-destructively and display moisture results immediately. The deviation is estimated at±0.012g/cm.  
        关键词：Neutron;moisture;compactness;Soil;calibration curve   
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        发布时间：2022-08-16
      • Xin Zhang,Yuewen Bao,Ruiqin Ding
        Vol. 11, Issue 5, (1988)
        摘要：In this paper 3 kinds of 〔14C〕 and 〔3H〕 changrolin labelled at different positions (Ⅰ, Ⅱ, Ⅲ) were prepared. The synthesis of I was illustrated in Scheme 1. Heating 5-bromoanthranilic acid with formamide yielded Ⅳ, which on heating with POCl3 gave V. Condensation of V with 4-aminophenol and then subjected to Mannich reaction produced 6-bromochangrolin (Ⅵ), Catalytic dehalogenation of Ⅵ with tritium gas gave I. The synthesis of Ⅱ was started from (14C) formamide and anthranilic acid. Labelled 4-chloroquine obtained was condensed with Mannich base (Ⅶ) directly (Scheme 2). Ⅲwas prepared by 1 step with (14C) formaldehyde (Scheme 1).  
        关键词：3H and 14C labelled;changrolin;antiarrhythmic agent   
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        发布时间：2022-08-16
      • Zhihao Zheng,Yongqiang Wang,Changgeng Liao,Jinzhong Xiang,Zhihui Ma
        Vol. 11, Issue 5, (1988)
        摘要：With resonance nuclear reaction 11B(p, α)αα(Ep=700keV), the determination of boron content in a-Si1-xCx:H(x=0.2) film of solar cells has been investigated. preparation of standard samples and measurement of the calibration curve are described. Particular aspects of the data treatment are discussed.  
        关键词：a-Si1-xCx:H film;standard samples;resonance nuclear reaction;α-spectrum;boron content   
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        发布时间：2022-08-16
      • Chaowen Yang,Maoliang Wu
        Vol. 11, Issue 5, (1988)
        摘要：In this paper, full energy efficiencies of Ge (Li) γ-spectrometers have been computed by Monte Carlo simulation. The computation is in agreement with the experimental results with an error of±10%.  
        关键词：Ge (Li) γ-spectrometer;full energy efficiency;Monte Carlo simulation   
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        发布时间：2022-08-16
      • Mingjun Wang,Ming Yin,Hekang Zhang
        Vol. 11, Issue 5, (1988)
        摘要：Many free radicals remain in the materials of XLPVC-wire and cable. At room temperature, even at 120℃, they are still stable and disappear slowly. When XLPVC is aged at 136℃ for 168h, the radicals make it crosslink further so that some of its properties are changed, e. g. the tensile strength is increased and the extension ratio decreased. Besides, the gel fraction is highly increased, and the increased percentage rises with the addition of crosslinking agent. This effect of residual free radicals corresponds to the rise in crosslinking efficiency of PVC and makes the gelation dose decrease. Before or after XLPVC is aged, the relationship between the sol fraction and the: irradiation dose can be described by .  
        关键词：radiation crosslinked polyvinyl chloride;residual free radical;heat ageing   
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        发布时间：2022-08-16
      • Naining Li,Yunsheng Zhou,Bingbing Fang,Zhili Wu
        Vol. 11, Issue 5, (1988)
        摘要：The influence of pretreatment and sealing of ampoules used for irradiation of Fricke dosimeter on its precision of application is studied. The optimal method of pretreatment and sealing could make the precision of measured values reach±1%. The feasibility of using 10 ml plastic dropper for irradiation is discussed.  
        关键词：Kaywords: Fricke dosimeter;ampoule;Pretreatment;sealing;precision;60Co-γ ray irradiation;plastic dropper   
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        发布时间：2022-08-16
      • Junfa Qin,Minqian Li,Yaoliang Xu,Zhifen Hua,Minzhuang Liu
        Vol. 11, Issue 5, (1988)
        摘要："Savage" is called as one of four mysteries in the world. The element spectra of "savage" hair have been determined by PIXE. Using the pattern mapping method, we have identified and classed the hair of "savage", animal and human.The samples from 5"savage" and from 10 primates or other animals are provided by the Community of the "Savage" Investigation of China, and 9 human hair samples are gathered from Shanghai and Beijing.The statistical analysis shows that the mean contents of all 10 elements determined in hair of "savege" are significantly higher than those in hair of human and animal, while the contents in hair of animal are not consistently higher than those in human hair. The nonlinear mapping algorithm (NLM) of these three kinds of hair indicates clearly that the "savage", animal and human have their own hair element spectrum characteristics.  
        关键词："savage" hair;trace element;PIXE;pattern mapping   
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        发布时间：2022-08-16
      • Hongxiu Yang,Zhongqian Ma,Qizu Wang
        Vol. 11, Issue 5, (1988)
        摘要：Based on a quantitative study on the quenching function of tritium contaminated machine pump oil, a graphic extrapolation method was proposed to determine tritium in the contaminated oil. Several methods for decontamination were also tested.  
        关键词：Tritium;decontamination of tritium;machine pump oil   
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        发布时间：2022-08-16
      • Mei Shen,Cailian Wang,Kongnan Zhao,Gang Xu
        Vol. 11, Issue 5, (1988)
        摘要：Studies on twelve varieties of different cultured rice showed that the mitotic indexdose relationship could be fitted by linear regression equations. The mitotic index was decreased with the increase of dose. The inhibitive effects on root tip cells mitosis were similar for different types of cultured rice but rather different from variety to variety.  
        关键词：gamma-ray;root tip cells;mitotic index;covariance analysis   
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        发布时间：2022-08-16
      • Qixun Chen,Peishu Xu,Wang,Shopei Liu
        Vol. 11, Issue 5, (1988)
        摘要：The chili is harvested in hot season, thus it may be large in number of bacterium contamination and liable to be molded in storage; and difficult to be kept in powder form. However, by irradiating the chili powder with Co-γ ray to 5 kGy within a proper package, total number of bacteria will drop by a factor of 104 and coliflora bacillus less than 30. Its colour, fragrance, taste and appearance are not affected for one year after irradiation if the package is good.  
        关键词：irradiation preservation;flavoring;dosage of irradiation   
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        发布时间：2022-08-16
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