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      • Liming Zhang
        Vol. 10, Issue 10, (1987)
        关键词：tritium nuclear magnetic resonance;labelling compounds   
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        发布时间：2022-09-13
      • Daihua Liang,Guantao Shen,Deyi Li,Junheng Wu,Muyao Zhou,Yongfa Zhang,Yitai Chen,Chuanshan Wang,Shuxin Zhou,Shengjun Zhang
        Vol. 10, Issue 10, (1987)
        摘要：Experiments of 19F (ρ,αγ)16O prompt nuclear reaction analyses of tea F contents were performed on a Cockroft-Walton accelerator. The principle and apparatus are described. More than 150 varieties tea samples were examined. Results show that for the same variety of tea samples, the higher the grade of the tea, the higher the F concentration it contains, and for different varieties, the better the tea, the lower the F concentration of the tea.  
        关键词：Prompt nuclear reaction;Cockcroft-Walton accelerator;tea fluorine concentration   
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        发布时间：2022-09-13
      • Jingcheng Wang,Liqun Feng
        Vol. 10, Issue 10, (1987)
        摘要：S-lineshape parameters of Doppler-broadening of positron annihilation were measured for a Ni-17—19 at% P amorphous alloy treated at different temperature. Results suggest that grain boundary corrosion and deviation from stoichiometric composition may be the possible factors resulting in low corrosion resistance of the alloy.  
        关键词：Positron annihilation;Amorphous alloy;Corrosion   
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        发布时间：2022-09-13
      • Baoxiong Shen,Baoguan Chen,Xinmao Shen,Yuhua Yan
        Vol. 10, Issue 10, (1987)
        摘要：Eleven elements, I, Br, Mg, Mn, Cu, Na, V, Cl, Al, Ca and S, have been determined in human hairs by reactor NAA with short irradiations. Multielement characteristics of Chinese human hairs have been studied in cumulative frequency distribution, correlation and in relation to sex and age. The results have been used for forensic studies by introducing double criteria——"difference rate" and "probability of accidental coincidence". Experimental results are summarized in 7 tables, and briefly discussed.  
        关键词：cumulative frequency distribution;Correlation coefficient;difference rate;accidental coincidence probability;identity discrimination;confidence level   
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        发布时间：2022-09-13
      • Yong Shen,Jinjiang Jiang,Meiqiong Yan,Tingjian Wang
        Vol. 10, Issue 10, (1987)
        摘要：A new method of producing surface barrier detector by using plasma oxidizing is reported. The preliminary results show that the producing time is short and the property is stable. The detector resolution (ф 20mm) for 241Am (a) is 0.7% at room temperature.  
        关键词：technology of plasma oxidizing;Energy resolution;Au-Si surface barrier detector   
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        发布时间：2022-09-13
      • Zhixiang Jiang,Yufu Wang,Fengying Wu
        Vol. 10, Issue 10, (1987)
        摘要：A backscattering detector of high resolution was configurated with a transmission Be window to detect coversion electrons or 6.3 keV conversion X-ray of the 57Fe source used for Mössbauer spectrum measurements. The energy resolution is 18% and 13% for 6.3 keV X-ray and 14.4 keV γ-ray, respectively. Its detection efficiency increases for low energy radiations. The detector and sample box system is desirable to set up a two-channel Mössbauer spectrometer, so as to obtain both absorption and backscattering spectra simultaneously.  
        关键词：backscattering detector;Mössbauer spectrometer   
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        发布时间：2022-09-13
      • Xingying Yu,Lianzhong Ding,Juyne Qi,Xiaozhong Zhu,Department Technical
        Vol. 10, Issue 10, (1987)
        摘要：The radiation sterilization of gelatin contaminated with 4×103 to 4×106 bacteria pel gram was investigated with electron beam from a JJ-2 accelerator. After treatment with the doses of 3—4 kGy, the initial microbial counts in the gelatin could be approximately reduced by two orders of magnitude and the coliform was substantively killed at the same time. The viscosities, transparencies and major gelatin compositions of the irradiated gelatin (with doses of 1.5—10 kGy) and the control sample were determined. The results show that the viscosity of the gelatin solution decreases gradually with the increase of the irradiation doses, the irradiation degradation of the gelatin molecules can not be decreased under the condition of nitrogen atomosphere or lower irradiation temperature, and the amino acid contents of the gelatin irradiated do not undergo any marked change in com-parison with the control sample except for cystine.  
        关键词：radiation sterilization;gelatin;Electron beam   
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        发布时间：2022-09-13
      • Yuqing Peng,Yiping Zhang,Wanhui Zheng,Dingfang Chen,Fanghua Yu
        Vol. 10, Issue 10, (1987)
        摘要：The cryostat system consists of a vacuum system, a temperature control set and a cryostat device. The performance of the system is as follows; Range of temperature adjustable,-187—500℃; Time of temperature equilibrium, 1-5 min, longer for very low temperature; Vacuum, 133.3-13.33 Pa; Resolution (FMHM) increase of the positron lifetime system,~10ps; Energy resolution of the γ -ray spectrometer, no change. No leakage of the radiation source was found. The cover, cooled by water, keeps nearly room temperature. The system has been used successfully for experiments of positron annihilation and annealing of ion-implanted semiconductor samples.  
        关键词：nuclear measurement;cryostat system;temperature variable   
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        发布时间：2022-09-13
      • Pingshun Hong,Yuxiong Li,Jiangdong Wei,Yue Sun,Shude Liu,Su Zhang
        Vol. 10, Issue 10, (1987)
        摘要：It is one of the important health physics subjects to study the potential ra????ogical effect of radionuclides induced in the soil surrounding higher energy accelerators on ground water.The informations and the results are provided in some details based on the analysis data of important element components and the original background of the soil and the estimates of the induced radionuclides in the soil and the ground water around HESYRL in the area with higher beam loss, which were measured by a low background γ-spectrometer system. Experimental results show that the radionuclides in the soil around HESYRL have no detectable effect on ground water source.  
        关键词：ground water;soil background;induced radionuclides   
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        发布时间：2022-09-13
      • Zenghai Li,Meiqin Xiao,Naifeng Mao
        Vol. 10, Issue 10, (1987)
        摘要：TRANSPORT-EM/PC is a program for beam optics. It can be run on an IBM-PC/XT microcomputer and used for the optimization design of charged particle optics systems composed of electric and magnetic elements. In this paper, the program is introduced. Both the microcomputer language limitations on the program and the solving methods, as well as the drawing of beam envelopes are discussed in detail.  
        关键词：charged particle optics and beam optics;microcomputer beam software;TRANSPORT-EM/PC   
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        发布时间：2022-09-13
      • Quanxun Song
        Vol. 10, Issue 10, (1987)
        摘要：The improvements are as follows: increasing the efficiency of the detector to 11%; reducing the delay time; using the best cyclic activation analysis condition; reducing the background and increasing the weight of the sample. Now the detection limit is about 0.7 ppb. We have determined the uranium contents of one multicrystalline and five monocrys-talline samples made in China. The uranium contents of ths multicrystalline and two monocrystallines can be determined and the other three's are lower than the detection limit. This paper also describes the methods of determination of the best cyclic activation analysis condition and cyclic amplifier factor by a computer.  
        关键词：Delayed neutron;repeating activation analysis;monocrystalline;trace uranium analysis   
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        发布时间：2022-09-13
      • Shuyu Wang,Zaijiu Cui
        Vol. 10, Issue 10, (1987)
        摘要：A polymethyl methacrylate frame with a 30 µCi 90Si-9OY annular source underneath was designed to measure eggshell thicknesses. The intensity of β-rays reflected from the eggs increases with the eggshell thickness. A curve was experimentally obtained to relate the β-ray intensity and thicknesses of eggshell, through which eggshell thickness can be determined nondestructively.  
        关键词：eggshell thickness;β-ray reflected   
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        <引用本文> <批量引用> 29838861 false
        发布时间：2022-09-13
      • Yihua Bai,Li Zhu,Limin Zhang,Peiling Xu,Lingzhen Wang
        Vol. 10, Issue 10, (1987)
        摘要：In electron beam radiation processing, ceric dosimeter is used to measure absorbed dose of substances. The range is between4×102 Gy and 5×105 Gy. The repetition standard deviation of the dosimeter is less than±4%. Fricke dosimeter is used to calibrate ceric dosimeter and G[Ce (111)]=2.48 ± 0.07 is got. This method has successfully provided a reference standard of absorbed dose for electron beam radiation processing.  
        关键词：ceric sulfate dosimeter;Electron beam;Radiation processing;high dose dosimetry   
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        发布时间：2022-09-13
      • Qichang Zhou,Jun Feng
        Vol. 10, Issue 10, (1987)
        摘要：The sterilization with γ-rays for medical catgut sutures, which were traditionally sterilized by the method of oil-bath, was described. It was shown that the medical catgut sutures were completely sterilized with the dose of 20 kGy. The qualities of the catgut sutures sterilized by y-rays were much better than that by oil-bath. For example, the catgut sutures had an increase of 14.57% in tensile strength and felt more soft. The processing period of the technology was three or five days shorter than that of the old one. By eliminating the three old processing procedures of drying, sampling and oilbathing, the radiation sterilization achieved an increase in the rate of finished products and a reduction in production cost.  
        关键词：medical catgut sutures;γ-rays;sterilization   
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        发布时间：2022-09-13
      • Pinfang Li,Chengfang Fan,Maoliang Wu
        Vol. 10, Issue 10, (1987)
        摘要：This paper describes the basic principle and experimental method for irradiating living plants by analysing the effect of 60Co γ-ray radiation dose on wheat and rice plants. With the measurement of the percentage of C, H, O and N in plants at the different growing period, the absorbed coeffecient of quality-energy and the F value of the transforming factor between Roentgen and Grey (X-D) were obtained. The F value for rice was 9.649× 10-3—9.452×10-3 Gy from tillering period to grain filling stage and that for wheat was 9.633×10-3—9.551×10-3 Gy. In addition the radiation absorbed dose for rice and wheat plants could be calculated. The results of the experiment provided the basic data for radiation of rice and wheat plants at the growing period to enchance the radiation mutagenic frequency.  
        关键词：60Co γ-ray radiation field;Absorbed dose;X-D transforming factor;rice plant;wheat plant   
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        发布时间：2022-09-13
      • Qizhong Mo,Bin Gong,Xin Huang,Pingchu Xu,Jumei Wang,Xingwei Kuang
        Vol. 10, Issue 10, (1987)
        摘要：The activities of mitochondrial monoamine oxidase (MAO)in brain of mouse are obviously increase with monthly added age of mouse. The activities of mitochondrial MAO in cerebrum and hippocampus of old rats (both male and female)are much more higher than young one. The traditional Chinese medicine of tonifying the kidney and tonifying the deficient essence could obviously inhibit activities of mitochondrial MAO in cerebrum and hippocampus of old rats and mouse, so it could prolong life of brain of rats and mice.  
        关键词：radiochemical method of enzyme assay;cerebrum;hippocampus mitochondria;monoamine oxidase;traditional Chinese medicine of tonifying the kidney and tonifying the deficient essence   
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        发布时间：2022-09-13
      • Yaozhang Huang,Yongxin Wang,Xiaochun Wang,Fuqi Wang,Jialing Huang,Xiaolan Wu
        Vol. 10, Issue 10, (1987)
        摘要：The localization of 125I-McAb of HCG-β was investigated in mice grafted with U14, S180 and lung tumor. It was found that the relative concentration of radioactivety in the area corresponding to the U14 tumor in comparison with the normal tissuse such as spleen, kidney and muscle was increased after i. v. injection of 125I-McAb of HCG-β and the concentration of tumor area in U14 mice was higher than in S180 and lung tumor mice.  
        关键词：Radioimmunoimaging;Monoclonal antibody;gamma camera;HCG-β   
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        发布时间：2022-09-13
      • Bingchai Zhu,Jiaben Lü,Tiehe Chen
        Vol. 10, Issue 10, (1987)
        摘要：In this paper, the correlation between chromosome aberrations and micronucleus in peripheral blood T-lymphocytes of macaque induced by different ways of y-ray irradiation is reported. The results indicated that chromosome aberration frequencies and micronuclear frequecies were increased with the radiation dose under acute single, fractionated cumulative and chronic continuous exposure conditions. The T-lymphocyte micronuclear frequencies in peripheral blood were increased with the chromosome aberration frequencies, and correlation between them were rather close.  
        关键词：γ-ray irradiation;Chromosome aberrations;Micronucleus   
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        发布时间：2022-09-13
      • Binyuan Shen,Meichu Luo,Tianming Yuan,Meizhen Zhang,Landi Li,Shungao Tong,Guibao Chen
        Vol. 10, Issue 10, (1987)
        关键词：3H-HPD;Distribution;Excretion;pregnant mice   
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        发布时间：2022-09-13
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