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      • Borong Bao,Yunlong Qian
        Vol. 09, Issue 6, (1986)
        关键词：medical cyclotron;radioisotope production;Fast neutron therapy   
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        发布时间：2022-09-13
      • Zhangzhi Wang,Hanmin Chen,Ruiqin Chen,Yunxia Lan
        Vol. 09, Issue 6, (1986)
        摘要：A new precise instrument for determination of the absolute disintegration of β, α emitter solutions by the method of liquid scintillation counting is described. The instrument includes a triple phototube liquid scintillation detector and three output counting channels which are used for the number of triple coincidences Nc, the number of sum of double coincidences ND and the number of sum of single phototube counting NE seperately. This instrument is based on the principle of extrapolating the triple to double coincidence ratio (TDCR) to unity.Examples of application of the instrument for 3H and 14C are given.The instrument has two main advantages: 1. Higher accuracy. The overall measurement uncertainty(3σ), for 3H, 63Ni, 35S and 14C etc. is in 0.5—1.5%. 2. Easy to operate. The measurement time is much less than usual metrology instrument.  
        关键词：Liquid scintillation counting;activity metrology;TDCR   
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        发布时间：2022-09-13
      • Shengyun Zhu,Mingli Dong,Weiqi Shen
        Vol. 09, Issue 6, (1986)
        摘要：The temperature dependence of the quadrupole interaction of 111Cd in In0.95 Ag0.045-Ga0.005 alloy is determined by the time differential perturbed angular correlation(TDPAC) method from 80 to 422K. The electric field gradients produced by the lattice in the alloy are derived. The temperature dependence of the electric field gradient follows the T3/2 law: Vzz(T)= Vzz(O)(1-B3/2) with a slop B=7.48(47)•10-5K-3/2. The FWHM's of the electric field gradient are 0.1147(259), 0.0924(340) and 1.344(175) at 80, 298 and 422 K, respectively. This indicates that the characteristics of the lattice structure of the alloy are better at 80 and 298 K than at 422K.  
        关键词：TDPAC method;quadrupole interaction;electric field;gradient T3/2law   
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        发布时间：2022-09-13
      • Qiji Lai,Fengmei Wu,Yongxing Jiang,Yongyi Lu,Yizhang Zhu,Yuanlin Wang,Wenquan Feng
        Vol. 09, Issue 6, (1986)
        摘要：In this paper, the experimental results of the radiation effects on MOS samples and sealed Si diodes and triodes using 10-12MeV electrons are presented. The features and practical values of radiation effects by high energy electron have been analyzed.  
        关键词：high energy electron;electron doses;defect energy levels;recombination centre;the lifetime of;minority carriers;interface states   
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        发布时间：2022-09-13
      • Fulin Xiong,Jinhua Liang
        Vol. 09, Issue 6, (1986)
        摘要：The alpha-card measurement is a new kind of nuclear technique to evaluate the concertration of the radium and thorium emanations with a short-time accumulation. It has shown the wonderful characteristics of higher sensitivity, greater detective depth, less interference and shorter work period when applied to search underground water resources in bedrock. The satisfactory result of its application in Pingyin limestone area is described. The principle of the alpha-card measurement and the foundation of its application are briefly discussed.  
        关键词：alpha-card measurement;underground water resource   
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        发布时间：2022-09-13
      • Xiaofeng Zao,Huixian Song
        Vol. 09, Issue 6, (1986)
        摘要：Simple harmomic oscillation equation (vertical motion) of the electrostatic deflector is derived. The first order transmission matrix for beam-extraction system is given. The method for determining initial emittance ellipse matrix of the extracted beam is analyzed. Finally, we compare the calculated results of extracted beam emittance with the measured results from similar cyclotron.  
        关键词：Cyclotron;transmission matrix for beam-extraction systems;extracted beam emittance   
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        发布时间：2022-09-13
      • Lixuan Wang,Yong Qiao,Xunyi Zeng,Lianfan Liu,Weinan Zhou,Miaojun Hu
        Vol. 09, Issue 6, (1986)
        摘要：This paper describes an 57Fe conversion electron Mössbauer spectrcscopic study of small bubble diameter material. The nominal composition of the film is (YLuBi)3-(FeGa)5 O12. After a dosage of 5×1013 to 1×1014 cm-2 100 keV Ne+ implantation, peaks of 2 and 5 of CEMS are emerged, indicating that the magnetization vector Ms of the surface layer of the film is toward the film plane. It was found that the stress induced magnetic plannar anisotropy owing to the dosage of ion implantation is not necessary to be very large. While d=2×1014cm-2, only paramagnetic spectra are obtained but the and d site spectrum is distinguishable. When d≥7×1013cm-2, hard bubbles are suppressed. High temperature 1050℃ annealling is required to restore the hyperfine field to the value in the as-grown state, however, peaks 2 and 5 are present in the spectra and hard bubbles are still suppressed.  
        关键词：CEMS;Ion implantation;garnet material;small bubble diameter   
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        发布时间：2022-09-13
      • Guanghua Zhang,Zhangsheng Lai,Lizhi Chang
        Vol. 09, Issue 6, (1986)
        摘要：The measurements of copper content in powder sample and on the wall of mine tunnel by the radioisotope X-ray fluorescence analyzer are described. The measurement of copper content in powder sample is mainly used as a grade monitor, its qualified rate has reached 95%. The copper content determined by fluorescence analysis on the wall of mine tunnel (1.738%) is more close to the true value (1.64%) than the one-obtained from cut trough sampling.  
        关键词：X-ray fluorescence analyzer;Powder sample;measurement on the wall of mine-tunnel;Matrix effect;copper mine   
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        发布时间：2022-09-13
      • Zhifang Fan
        Vol. 09, Issue 6, (1986)
        摘要：The principle of a double control and breakdown prevention device is described. The operational performances are described. It has been proved experimentally that this device can effectively prevent the accidentally terminal voltage rising that may result a destructive breakdown. With the help of the device, the energy of accelerated particle has been increased from 2.0 МеV to 2.88 MeV, the regulation of beam is also made much more conveneint and safer, and the voltagestability has been improved noticeably.  
        关键词：Van de Graaff accelerator;double control voltage regulation;protection against over voltage;rotating voltmeter;control linearly;the triode to control corona current   
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        发布时间：2022-09-13
      • Bangfa Ni,Weihong Shang,Yongjun Sun
        Vol. 09, Issue 6, (1986)
        摘要：K0-values of 23 nuclides used in monocomparator method of reactor neutron activation analysis have been measured. The accuracy is better than 4%. In the measurement, 95Zr-97Zr are used as flux monitor and 198Au as comparator nuclides which are exposed to diferent irradiation conditions (31<ϕth/ϕep<115) in the HWRR of Institute of Atomic Energy. The concentrations of 20 elements in the standard reference materials 1632a, GXR-4 and BCR-1 have been analyzed using K0-method. The results are consistent with the values in literature within the extent of errors.  
        关键词：monocomparator method;K0-value;flux monitor;Standard reference material   
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        发布时间：2022-09-13
      • Benren Zhu,Huizhen Xue
        Vol. 09, Issue 6, (1986)
        摘要：By the use of Chinese-made WGJ-1 uranium analyser the uranium contents of many nature water samples were determined. The results were satisfactory.  
        关键词：nature water;trace amount uranium;method of laser-induced fluorescence   
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        发布时间：2022-09-13
      • Yingcai Zhou,Bihuai Yuan,Peishu Xu,Xiuying Wang
        Vol. 09, Issue 6, (1986)
        摘要：Alcohols, ethers and organic acids in irradiated sweet potato wine have been determined with capillary GC. The results show that amount of some components has changed after irradiation, but no new species are formed. The G values of the changed components have been calculated.  
        关键词：Irradiation;sweet potato wine   
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        发布时间：2022-09-13
      • Wenmei Shen,Zengyue Tian,Fulu Liu,Xiulan Tang,Taihang Wang,Miaogen Su
        Vol. 09, Issue 6, (1986)
        摘要：A combustion method for preparation of 3H-labelled biological samples for counting was reported. The recovery of this method was about 94-97%, and the efficiency of counting was 32-37%. The error due to quenching was reduced to a much lower degree. This method was successfully used in the study of drug metabolism.  
        关键词：3H-labelled compounds in biological samples;combustion method;drug metabolism   
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        发布时间：2022-09-13
      • Chengmo Zhu,Jixian Zhang,Shengguo Zhang,Lansheng Gong,Shuying Lin,Bohui Wu,Yulin Hu,Yuyuan Xie
        Vol. 09, Issue 6, (1986)
        摘要：The preliminary clinical uses of 131I-mIBG in 13 cases of adrenal medulla imaging and 6 cases of myocardial infarction imaging were reported. Normal myocardial imaging or no imaging was obtained in the former cases, while radioactive defect was found in infarcted site. It is thus suggested that 131I-mIBG myocardial imaging would be helpful for the diagnosis of myocadial infarction. Besides, it may be also used in diagnosis of pheochromcytoma and the investigation of catechclamine metabolism in myocardium.  
        关键词：131I—mIBG;myocardial imaging;Myocardial infarction   
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        发布时间：2022-09-13
      • Zhiling Xiong,Xilin Cai,Lun Ma,Fei Chen,Zhou Sun
        Vol. 09, Issue 6, (1986)
        摘要：The influences 1-stepholidine(1-SPD)on the hepatic blood flow (HBF) in anaesthetized rats were studied by investigating the elimination rate of 113mIn in blood. The value of HBF of normal rats was 0.89±0.17(SD)ml/min per g liver calculated from the K value (0.447±0.070 min-1), which was consistent with the value (0.90±0.17 ml/min per g liver) determined by other method.1-SPD decreased the HBF like Iso, with doses of 10,20 and 40mg/kg i. v., but the latter could not be antagonized by propranolol. 1-SPD(20mg/kg) was able to antagonize the increasing HBF effects of NE like phentolamine. It is suggested that the hypotension effect of 1-SPD may be resulted from its α-adrenoceptor blocking effect.  
        关键词：113mIn-colloid;1-stepholidine;hepatic blood flow;α-adrenoceptor   
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        发布时间：2022-09-13
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