最新刊期
      卷 0 ， 期 0 ， 2020
      • Jufeng Pang,Guifang Zheng,Yawei Zhang,Rong Wu
        Vol. 12, Issue 3, (1989)
        摘要：This paper reports on several methods of analyzing soil samples by using an anti-Compton Ge (Li) gamma-ray spectrometer with high sensitivity and resolution. The methods have been examined with the standard samples having known composition and the standard soil samples transferred by NBS standard. The results were also compared with those from other laboratories. It was shown that for the determination of radionuclides, especially 238U, in soil samples, the use of anti-Compton Ge (Li) spectrometry is a handier way with a higher accuracy than the method using Ge (Li) spectrometry merely. When analyzing an anti-Compton spectrum using the efficiency curve measured with a 182Ta+152Eu+soil standard source, the accuracy of results is the highest (better than 3%) .  
        关键词：Anti-Compton Ge (Li) gamma-ray spectrometry;Soil sample;Analysis method   
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        发布时间：2022-08-16
      • Wenxiu Shen,Jianhuan Zhu,Zhenshui Hao,Jiakai Zhao,Xiangrui Guan,Weigang Li
        Vol. 12, Issue 3, (1989)
        摘要：The preparation and dosimetric characteristics of three types of radiochromic nylon film dosimeter, which contain lauco dyes of pararosaniline cyanide (PR-CN) , hexahydro-xyethylpararosaniline cyanide (HPR-CN) and hexahydroxypropylpararosaniline cyanide (HPPR-CN) respectively, are outlined and comparatively studied. With a dose range of 0.5-200kGy, and high environmental stability and durability, nylon film dosimeters are more suitable for practical routine dose measurement than polyvinylbutyral (PVB) matrix film dosimeters.In order to improve the precision a dual wavelength radiochromic multireader Model RCR-86 and a simulated dual wavelength spectrophotometric method are recommended, which cancel the deviation originated from surface reflection, scatering, geometric positioning etc.  
        关键词：Radiochromic nylon film dosimeter;Hexahydroxypropylpararosaniline cyanide;Pararosaniline cyanide;Hexahydroxyethylpararosaniline cyanide;Dual wave-length spectrophotometry;Dose measurement   
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        发布时间：2022-08-16
      • Zongren Shi,Xiantang Zeng,Ming Zhang
        Vol. 12, Issue 3, (1989)
        摘要：Tne facility has been set up on the 10 MW heavy water reactor in the Institute of Atomic Energy. A 50 cm long single crystal silicon cooled by liquid nitrogen is used for improving the quality of thermal column. At 77K, the neutron flux is 1.3×107, Cd-ratio is 30000 and γ-dose in the beam is 1.935×10-8C/kg·s.The calculation of the neutron collimetor is given in detail. Neutron flux for a conical collimator is 1-4 times more than that for a straight collimator with the same angle converging. The relations of flux and angular divergence with the shape of collimator are described.  
        关键词：Neutron flux;Cd-ratio;Collimator;Filter;Single crystal silicon   
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        发布时间：2022-08-16
      • Liming Zhang,Dongzhu Zheng,Jianming Yuan,Xiaoma Jiang
        Vol. 12, Issue 3, (1989)
        摘要：1H NMR, used for structure analysis of 2H labelled compounds only by peak area reduction in 1H NMR spectrum, is restricted in a non-coupling proton system with 2H content more than 10% otherwise the results will be obscure. As an improvement, 2H NMR is directly used to observe the 2H NMR signal and calculate percentage of 2H in every exchange group from the area of peaks. Deuteriated compounds were prepared by acid-catalyzed exchange at 135℃ in dilute acid media (DC1-D2O) and using PtO2. 2H NMR parameters are as follows: resonance frequency of 15.25 MHz, pulse width of 7.5µs, pulse delay time of 200 ms, and noise decoupling of 0.5 kHz.  
        关键词：Deuterium labelled;Alanine;1H NMR;2H NMR   
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        发布时间：2022-08-16
      • Chaoqun Tang,Desheng Tan
        Vol. 12, Issue 3, (1989)
        摘要：A study on positron lifetimes in lowly La-doped ceramic BaTiO3, which has semi-conduction, is reported. The experiment results show that the lifetimes τ1 and τ2 decrease first and increase after, the intensity I2 increases first and decreases after with increasing amount of La, and these parameters turn at the same x value. The changes of τ1, τ2 and I2 below the turn result from increasing of Ba vacancies with increasing La. To explain the results a complex defect (Ba vacancy+La ion complex) model was proposed. The experimental results show that this complex defect does not trap positrons.  
        关键词：BaTiO3;La-doped;Positron lifetime;Ba vacancy;Complex defect   
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        发布时间：2022-08-16
      • Jiahua Wang,Hui Zhang
        Vol. 12, Issue 3, (1989)
        摘要：The data communication method described in this paper is designed to facilitate the data transfer among S-80 MCA, MS-900 Mössbauer spectrometer based on Apple-II microcomputer and PDP-11 computer system. Some simple processing for spectral data is available in the microcomputer. The least square fitting for spectral data is performed in PDP-11 computer system while the microcomputer is used as a terminal.  
        关键词：RS-232 interface;Data communication   
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        发布时间：2022-08-16
      • Shilu Tong
        Vol. 12, Issue 3, (1989)
        摘要：Various procedures were compared in relation to the removal of 141Ce exogenously contaminated as well as endogenously incorporated in hair. Extraction efficiency of cerium with hot EDTA was the greatest among the four washing procedures. However, no procedure can effectively remove all exogenous cerium without reducing the endogenous cerium.Among the four procedures evaluated, washing with 0.1mol/1 EDTA (50℃, 10 minutes) is recommended before the analysis of rare earth elements in hair because of its efficiency in removing exogenous cerium and causing less loss on endogenous cerium.  
        关键词：141Ce;Tracer;Rare earth;Washing procedures   
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        发布时间：2022-08-16
      • Bao Huang
        Vol. 12, Issue 3, (1989)
        摘要：Considering the transfer process of carriers and the plasmic effect, we derived a formula of calculating time response function to heavy charged particles in PIN semiconductor detectors. The method of determining the parameters in the formula was also discussed.  
        关键词：Semiconductor detectors;Time response function;Heavy charged particles;Plasmic effect   
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        发布时间：2022-08-16
      • Jiansheng Chen,Yongsen Yi,Yaoqing Lin,Xiaoying Cui,Xinnuan Zhang
        Vol. 12, Issue 3, (1989)
        摘要：It is a successful method to use radioisotope tracer technique for detecting the leakage of a dam. We have applied 131I as the tracer in many boreholes around Nanfu dam of Haizi reservoir in Beijing, to detect the leakage. The isotope tracer flow meters had been used to detect the direction and velocity of underground water flow in the boreholes at the depths of 20—90 meters, A main leakage passageway under the dam was confirmed by the detection, thus providing a scientific basis for reinforcing the dam.  
        关键词：Dam;Leakage;tracing;underground water;single borehole   
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        发布时间：2022-08-16
      • Shibin Yao,Zigen Chen
        Vol. 12, Issue 3, (1989)
        摘要：The design principle, physical scheme, technological process, construction and safety features of a special facility used for irradiating liquors is briefly described. 0.925× 1015 Bq cobalt source is used and the irradiation capacity for liquors approaches 10t per day. The facility bears advantages of simple in construction, easy to operate, safe, reliable and efficient in source utilization.  
        关键词：Irradiation facility;Cobalt source;Irradiation capacity;Radiation protection   
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        发布时间：2022-08-16
      • Zongwen Wu,Chongde Gu,Jiquan Luo,Yuming Zhang
        Vol. 12, Issue 3, (1989)
        摘要：The irradiation process for 300 tons of garlic on a 2.96×1014Bq Co60 radioactive source was studied. From results of dose measurements with Fricke dosemeter, optimum. mode of irradiation was selected. Garlic was placed 110 cm away from the source center. The mean absorbed dose was 100 Gy, with Dmax 160Gy and Dmin 67Gy. The processing capacity was 16 tons a day and the efficiency of the source was approximately 5%, The dose distribution along every directions was also discussed.  
        关键词：Stationary irradiation;Garlic;Absorbed dose   
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        发布时间：2022-08-16
      • Yaozhang Huang,Yongxin Wang,Xiaochun Wang,Fuqi Wang,Jialing Huang,Quanhai Liu
        Vol. 12, Issue 3, (1989)
        摘要：125I-labelled anti-AFP McAb IgG and normal mouse IgG were prepared and evaluated by radioimmunoimaging of a chemical induced liver cancer bearing rat and a human liver cancer xenografted nude mice. The imaging were made with a gamma camera at 24, 48 and 72 h after intravenous injection of 3.7×106Bq of 125I-anti-AFP McAb containing lmg of IgG into each tumor-bearing animal. The accumulation of anti-AFP McAb in tumor was indicated but not with the same dose of 125I-normal mouse IgG.  
        关键词：Monoclonal antibody;Radioimmunnoimaging;125I-labelled anti-AFP McAb;Gamma-camera   
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        发布时间：2022-08-16
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