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      • Guanghua Zhu,Xunliang Ding
        Vol. 11, Issue 2, (1988)
        摘要：The mechanism of radiation damage effects on electronic devices and the applications of ion beam analysis in the investigations of radiation hardening were presented in this paper.  
        关键词：radiation hardening;ion beam analysis;Displacement effect;ionization effect   
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        发布时间：2022-08-16
      • Yaochen Yang
        Vol. 11, Issue 2, (1988)
        摘要：The results of γ ray shielding investigated by Monte Carlo method with annular coordinate are given in this paper. It is shown that the γ ray shielding is a very important problem for the fusion-fission hybrid reactor design. It is discovered that among all γ ray sources the inelastic scattering γ ray source is important. This character of the hybrid reactor is different from the fission reactor.  
        关键词：Monte Carlo method;fusion-fission hybrid reactor;γ ray shielding   
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        发布时间：2022-08-16
      • Liuchun Liu
        Vol. 11, Issue 2, (1988)
        摘要：A portable X ray fluorescence analyzer was used for detecting fluorescent X rays from the elements associated with gold ores. Fe, As and Ni were chosen to be the indicator elements to analyse rock samples in Wenyu gold mine. Optimum indicators were determined, and it had proved to be successful to detect gold indirectly by measuring the yields of characteristic X rays of the elements. The method provided also valuable information on geology mapping and deposits forming environment.  
        关键词：Gold;prospection;indicator elements;portable X ray;fluorescence analyzer   
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        发布时间：2022-08-16
      • Chunlong Piao,Baojie Wei
        Vol. 11, Issue 2, (1988)
        摘要：A sealed ceramic neutron tube developed over the past years is reported. The tube made of sealed ceramic to provide high-voltage insulation and solid drive-in target to extend the lifetime. The neutron yield is better than 109 n•s-1 using the D-T reaction and 107n•s-1 using the D-D reaction. Tne tube has been operated for more than 500h.  
        关键词：Neutron tube;Lifetime;drive-in target   
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        发布时间：2022-08-16
      • Qingping Han,Weichang Lu,Yanpei Zhou,Banglin Chen,Bincai Wu,Hengchuan Liu
        Vol. 11, Issue 2, (1988)
        摘要：The synthetic procedure of the titled reagent and its colour reaction with U (Ⅵ) is reported. The reagent was obtained by the coupling reaction of m-nitroanilinediazonium salt with bromophosphonazo I. It formed a stable blue-purple complex with U (Ⅵ) in a strong acidic medium and the wavelength of maximum absorbance was observed at 684nm. Beer's law was obeyed over the range of 0—45 µg U (Ⅵ) in 25 ml. The value of molar absorptivity at 684 nm was found to be 8.4×104 1•mol-1•cm-1 and 1.0×105 1•mol-1•cm-1 in the presence of the nonionic surfactant, Triton X-100. The foreign ions such as Fe (Ⅲ), Al (Ⅲ), Ca (Ⅱ), etc. produced interference on colour reaction but Al (Ⅲ) and Ca (Ⅱ) could be masked with masking reagents. The outstanding advantages of this method are simplicity, high sensitivity and good selectivity as well as the complex is very stable. The reagent is suitable for applied to the direct spectrophotometric determination of microgram amounts of U (Ⅵ) and the results are found to be satisfactory.  
        关键词：developing agent;bromophosphonazo-mN;colour reaction;Uranium   
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        发布时间：2022-08-16
      • Zhutang Wen,Riyou Luo,Peide Wang
        Vol. 11, Issue 2, (1988)
        摘要：A study was made of the effects of different temperature and relative humidity during storage and irradiation on the gamma ray response of acid-sensitive radiochromatic film dosimeters. The results showed that the effective response characteristics of the dosimeters are appreciably influenced by storage and irradiation conditions.  
        关键词：Radiation processing;Dosimeter;radiochromic film dosimeter   
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        发布时间：2022-08-16
      • Jiahui Gu,Jingyi Liu,Genlai Xiao,Zhongming Liu,Yan Li,Shuanghui Shi
        Vol. 11, Issue 2, (1988)
        摘要：An improvement have been made in acquiring data of delayed coincidence spectra with ND-620 data acquisition system and off-line data analysis program. The delayed and anti-delayed coincidence spectra can be obtianed in one run. The difference of their centroids is the mean lifetime τ. The centroid position of a delayed coincidence spectrum is the zero time of another delayed coincidence spectrum, so the requirement of measuring prompt time spectrum is avoided. The walk of prompt and delayed coincidence spectrum coming from different run are resolved and the walk during the measurment is compensated partly.The delayed coincidence time spectra of 207Pb 569.7 keV state are measured and the half lifetime is calculated via three different methods (slop method, convolution method, centroid shift). The final value of half lifetime is 129.5±1.4ps. The experimental reduced transition probability is compared with theoretical values.  
        关键词：delayed coincidence;half lifetime;multiparameter acquisition   
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        发布时间：2022-08-16
      • Chuanyuan Yin,Caihua Zhou,Dexun Shen,Minkang Teng
        Vol. 11, Issue 2, (1988)
        摘要：In this paper a linear relation between the life time of positron annihilation and molecular weight of weight average in polyvinylmethylsiloxane is simply deduced according to S. Y. Chuang's hypothesis. The experiment results with polyvinylmethylsiloxane show that there is a linear relation between the life time of positron annihilation and molecular weight of weight average. The molecular weight of the polyvinylmethylsiloxane is determined by this linear relation. The result is compared with other results obtained by the viscosimetry method. The difference between them is less than 3.7%.This paper also discusses the experimental results and the authors put forward the method to determine molecular weight.  
        关键词：linear relation;Positron annihilation;molecular weight of weight average;Life time   
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        发布时间：2022-08-16
      • Liang Tao,Fuzhai Cui,Jianguo Ding,Yi Zhong,Liping Zheng
        Vol. 11, Issue 2, (1988)
        摘要：The Monte Carlo simulation codes, TCIS, has been used in many studies on surface physics. In transplanting the codes onto a PDP-11/70 computer, however, there did exist some difficulties such as extremely big values of array element subscripts, too many statements, etc. This work found ways to solve these problems with virtual arrays and overlay techniques. Examples of applying the codes on the computer were given.  
        关键词：Computer simulation;collision cascade;code transplant   
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        发布时间：2022-08-16
      • Jiarui Liu,Junsi Zhou,Yupu Li,Zhen Wu
        Vol. 11, Issue 2, (1988)
        摘要：A target chamber for ion implantation and in-situ electrical measurement at temperatures variable between 77-800K is presented. It has over the years been used at beam power of about 10 W for ion beam mixing of metals, sillicides and some superconducting materials. Temperature drifts measured are±3 K at the values selected.  
        关键词：Target chamber;Ion implantation;Ion beam mixing;Low temperature;High temperature   
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        发布时间：2022-08-16
      • Daoquan Xu,Xiufeng Peng,Shuyuan Zhang,Jiannan Jin,Shushan Jin,Maolun Zhou
        Vol. 11, Issue 2, (1988)
        摘要：Methods for preparing Bi targets have been studied to optimize the production of 211At. A method is emphatically described which is based on vacuum evaporating Bi metae with 99.999% chemical purity onto a copper disk (50×2 mm).These Cu-supported Bi targets have been bombarded with 27 MeV α-particles from 1 cyclotron. No crackle, puffiness and dropping of target have been found.  
        关键词：Bi;target preparation;vacuum deposition;astatine-211   
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        发布时间：2022-08-16
      • Kezun Xu,Fang Zhang,Guanhua Liu,Shulan Wu,Xuegong Liu,Guangwen Yan,Ruiqi He
        Vol. 11, Issue 2, (1988)
        摘要：Studies have been made on the improvement of detection limit, sensitivity and accuracy for XRF analysis with an XRF instrument consisting of a Si (Li) detector, a microcomputer-based MCA and a radioisotope source. Normal values of trace element contents in human hair samples from Hefei, Anhui province, were given.  
        关键词：X-ray fluorescence analysis;detection limit sensitivity;Human hair;Trace element   
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        发布时间：2022-08-16
      • Sufang Wang,Wei Cai,Jiwen Zheng,Guozhao Liang,Xijun Sun
        Vol. 11, Issue 2, (1988)
        摘要：In this paper a simple tape transport system to measure the nuclei with half-live T1/2≥1 s was described. The reaction products are collected on a Mylar foil, which was then transported immediately to the measurement spot. The vacuum in the reaction chamber was 2.67 mPa and while the tape was pulled the vacuum decreased to 6.67 mPa. The vacuum was recovered immediately to the original value when the tape's movement is stopped. a γ ray spectrum of products from reaction 12C+112Sn was also given.  
        关键词：tape transport system;short lifetime nuclei   
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        发布时间：2022-08-16
      • Wei Shen,Hongjun Zhu
        Vol. 11, Issue 2, (1988)
        摘要：The paper describes two kinds of high power scanning circuits for electron beams. Scanning homogeneities of more than 90% were experimentally achieved. They can be used in electron accelerators with energies of up to 20 MeV.  
        关键词：Scanning power supply;Accelerator;high power;homogeneity;steplike-distribution waves;balanced transformer less power   
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        发布时间：2022-08-16
      • Yunsheng Dai,Daoquan Xu,Jianhua Cao,Xuecai Liang,Dairong Wan
        Vol. 11, Issue 2, (1988)
        摘要：A filling and drawing device for long liquid scintillator is described. The device has ensured long-term stability to a position-sensitive spectrometer to determiene cross-sections of small-angle elastic scattering of fast neutrons. It may be of use for other research areas with similar requirement of experimental conditions.  
        关键词：Liquid scintillator;filling and drawing system;position-sensitive spectrometer;small-angle elastic scattering   
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        发布时间：2022-08-16
      • Songsheng Shao,Jialin Feng,Meijun Zou,Hongzhen Liu,Yaping Lin
        Vol. 11, Issue 2, (1988)
        摘要：The relationship between the radiation doses and the chromosomal aberrations of peripheral lymphocytes was studied in patients under-going catheterization with or without angiocardiography.The radiation doses were estimated and chromosomal aberration analyses were carried out in 17 cases. They consisted of 10 males and 7 females at the age of 4 to 26 years with an average of 14 years.Doses in the chest and gonadal regions were measured with calibrated thermoluminescent dosimeters. Peripheral blood samples were taken immediately before and after the diagnostic procedure for chromosome analyses.Results showed that the average doses in the gonad region during cardiac catheterization with and without angiocardiography were 2.4 and 0.83 kC/kg respectively, while those in the chest region were as high as 0.93 and 0.54kC/kg respectively. The chromosome aberration rate in both groups were significantly higher (2.75—3.33%) than the control value (0.22—0.75%) which was determined before X ray examination. No statistically significant difference of chromosome aberration yield was found between the two groups with and without angiocardiography.  
        关键词：cardiac catheterization;angiocardiography;radiation doses;chromosomal aberration   
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        发布时间：2022-08-16
      • Yan Wang,Zhenqiu Hu,Jinshui Zhou,Waigou Li
        Vol. 11, Issue 2, (1988)
        摘要：Our experiments show that the H-number quench correction method may be used not only in standard liquid scintillation counting but also in small volume liquid scintillation counting. Considering this characteristic and the sample holding capacity, the RIA' sample volume is reduced and poured into a disposable polyethylene tube with cap (12×50mm) containing one milliliter scintillation cocktail for counting. It is more convenient for operating and more than 80% of scintillation cocktail can be saved. The system has been used in RIA of tetosterone, estradiol, estriol, chloropromazine and so on. The results are reliable.  
        关键词：liquid scintillation system;small volume;Radioimmunoassay   
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        发布时间：2022-08-16
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