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      2020 年 第 0 卷 0 期

        综述

      • 国辉 胡,红海 钟
        1981, 04(5)
        摘要：地球化学和地质工作者的首要任务是要确定地球及地球以外的物体中元素的含量和分布。这些物体包括地球岩石、矿石、矿物、土壤、水和大气，以及陨石、玻璃陨石、月岩和月壤。在大多数地球样品中，元素按其丰度可分为常量元素（>1.0%）、微量元素（0.01～1.0%）、痕量元素（＜0.01%或100ppm）和超痕量元素（<0.1ppm）[1]。硅、氧、铝、铁、镁、钙、钠、钾、钛和磷等元素的含量，在大多数岩石中都是落在常量元素的范围内，这些元素正是14MeV中于活化分析在地学样品中所要分析的主要对象。虽然通常的重量法、容量法及其他分析方法都能分析这些元素，但14MeV中子活化分析对这些元素却具有快速、精确和非破坏性等一系列优点。因此14MeV中子活化分析在地学方面的应用，主要是作为常量元素的分析工具。  
          
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        发布时间：2022-08-16

        科研成果报告

      • Li Huantie,Wang Linzhou,Li Lili,Zhou Yuehua,Zhu Yongsheng
        1981, 04(5)
        摘要：A total absorption type lead glass Cerenkov counter has been constructed. The ZF1 type lead glass was homemade. Performance and experimental results are described in this paper. The experimental method of energy calibration by use of the cosmicray muons is presented.  
          
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        发布时间：2022-08-16

        简讯

      • 国发 王,贤芳 柳
        1981, 04(5)
        摘要：法国INTER TECHNIQUE公司是欧州主要的核子仪器厂家之一，短短的十几年里，在能谱分析器方面，继BM-96、DIDAC-C、TRIDAC-C、PLURIMAT、IN-90之后，目前生产了IN-96、IN-110两种第五代信号分析器。上海拖拉机汽车研究所已进口了一台IN-110实时信号分析仪。现将该系统作一简介：  
          
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        发布时间：2022-08-16
      • Pan Haochang,Wei Shijun
        1981, 04(5)
        摘要：The crosstalk spectra of liquid scintillation counter were analysed and investigated in this paper. We have manufactured a crosstalk discriminator. By using the discriminator in the liquid scintillation counter, the background of measuring 14C was decreased from 3.499±0.059cpm to 2.222±0.027cpm; the merit was increased from 1820 to 2738; but the efficiency still reached to 78.0%; the count of empty bottle was decreased from 4.560±0.0675cpm to 1.156±0.034cpm.  
          
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        发布时间：2022-08-16
      • Guo Zhendi,Sun Chuanshen,Chen Wenxiong,Zheng Xiucong,Zhuang Guochen,Huang Yuanshan,Xu Peihua
        1981, 04(5)
        摘要：A microsecond width single pulse beam has been modulated from a 2.5 MeV Vam de Graaff accelerator. With the beam falling on the surface of a PIN or Au-Si surface barrier semiconductor detector, the wave shapes of the detector output current and the beam current were photographed simultaneously and compared with each other to find the influence of charge deposition in depletion region on the time plateau of the current wave shape and the collecting time, thus to obtain the collecting efficiency and other parameters. Under different beam magnitudes and biases, changes in output current wave shapes of some home-made PIN and Au-Si detectors were measured.  
          
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        发布时间：2022-08-16
      • Wang Xiugui
        1981, 04(5)
        摘要：The measurement principle of the transmission gamma ray densitometer and the accuracy analysis are described. The effect of air bubbles in pulp on measurement accuracy and its regular pattern are theoretically studied.The necessity of developing a device for detecting bubbles in pulp within pipes, and its operation principle and structure are presented. Finally, the method of purging bubbles from pulp is reviewed and the effect of bubbles on measurement accuracy is experimentally demonstrated.  
          
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        发布时间：2022-08-16
      • Zhang Shuda
        1981, 04(5)
        摘要：In this experiment a ST-402 plastic scintillator (ϕ100×0.3mm) and a NaI(Tl) crystal (ϕ100×25mm) were used as the β and γ ray detectors respectively.The 186 keV photo peak was chosen as radium channel. The unsealed samples were measured with β-γ spectrometry. The counting time was 10 min for each sample. The advantages and disadvantages of this method were discussed at the end of the paper.  
          
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        发布时间：2022-08-16
      • Li Hetong
        1981, 04(5)
        摘要：The principle, structure and characteristic of a thermal neutron counter working in the corona discharge region are described. The influence of technology and operating conditions on the characteristics of the counter has been experimentally studied. The counter possesses such interesting advantages as lower operating voltage, wider length of plateau, higher pulse amplitude, the stability of heat, the applicability under strong radioactive γ background and a longer life.  
          
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        发布时间：2022-08-16
      • Ji Changsong,Su Jinxia
        1981, 04(5)
        摘要：The influence of the thickness of the luminescent material ——p-Terphenyl in ST-551 organic scintillator on the β/γ ratio and the relation between the thickness and the output pulse amplitude were studied. With the increase of the thickness, the β/γ ratio decreases and the output pulse amplitude increases.For a 90Sr-90Y β source and a 60Co γ source, with the thickness of p-Terphenyl being 7~12 mg/cm2, the β/γ ratio can reach to 800 with pulse amplitude acceptable.  
          
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        发布时间：2022-08-16
      • He Zhongda,Xu Yongping,Zhang Zicheng
        1981, 04(5)
        摘要：The radiation effect of solar cell and the use of it as a sensitive apparatus to determine dose rate of 60Co γ-rays were reported.  
          
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        发布时间：2022-08-16
      • Wei Baowen,Luo Shiyu
        1981, 04(5)
        摘要：A particle motion equation has been derived on a 4-fold symmetrical radial sector cyclotron and the stationary orbit properties were analyzed numerically for a 2α=52° machine. The result showed that the particle motion is relatively stable when the particle energy is less than 100 MeV/A.  
          
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        发布时间：2022-08-16
      • Li Yihao,Tang Zhenxin,Yin Linxiang
        1981, 04(5)
        摘要：This report describes the applications of radio-gas chromatography (RGC) in identification of some 3H and 14C labelled compounds and determination of content, specific activity as well as radiochemical and chemical purity. Some problems in the use o proportional counter are discussed.  
          
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        发布时间：2022-08-16
      • Huang Yaozhang,Zhang Jianshi,Wang Yongxia,Wu Yanong,Sun Wenjiang,Xi Shujing
        1981, 04(5)
        摘要：The 67Ga distribution and scanning in normal mice and tumor bearing mice (S180、U14、 Sp、Ca615、Walker256) were made. 67Ga were concentrated by tumor tissues of mice and positive scintigrams were obtained in all cases.  
          
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        发布时间：2022-08-16
      • Shao Hesheng,Jing Xinan,Ying Lanqing,Zhao Minmin
        1981, 04(5)
        摘要：3H-tanshinone II-A sulphonate was given to rats intravenously. The distribution of radioactivity was the highest in liver, then spleen, kidneys and lungs, and each reached its maximum in 2 hr. after injection. The biological half-lives (t1/2 alpha and t1/2 beta) were 27 and 199 min respectively. Within 72 hr., the activity was excreted 18%in the urine and 75% in the feces. By thin-layer chromatography and autoradiography of bile, urine and feces 3 spots of metabolites were found.  
          
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        发布时间：2022-08-16

        工作简报

      • Zhang Guangming,Zhao Deyao,Zhou Weizhen
        1981, 04(5)
        摘要：After the crystals are cleft into plates, they are etched in a 5~10% KI-water solution to eliminate the damages in the cleft surfaces. The etched crystal plates are contacted with "Aquadag" and palladium wires are attached to the contact with carbon paint. Such a detector is encapsulated in a teflon support. Using a HgI2 detector with active surface of 8 mm2 and thickness of about 200µm, a bias of 600V, at the temperature of 283°K, with pulse shaping time being 3.2µs and for an uncollimated source, it is shown that the energy resolution (FWHM) of the detector is 1.4keV for 5.9keV of 55Fe, 1.7keV for 22 keV of 109Cd and 3.62 keV for 59.5 keV of 241Am respectively. The line width of electronics is 1.1 keV.  
          
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        发布时间：2022-08-16

        来稿摘登

      • 彦洪 梁
        1981, 04(5)
        摘要：吡喹酮是治疗血吸虫病的一种新型药物，其疗程短、疗效高、副作用轻，它的化学结构式为：为了研究该药的作用机理和代谢产物，我们用催化交换法制备了3H-吡喹酮。  
          
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        发布时间：2022-08-16
      • 永兴 周
        1981, 04(5)
        摘要：全国农用60Co源室在结构设计和操作控制系统方面都是大同小异，如何进行改进，使自动装置安全、可靠运转，这是摆在60Co源室操作人员面前的一件重要的工作。根据我们多年来使用60Co源的经验，对自动装置初步作了改进，现介绍如下：  
          
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        发布时间：2022-08-16

        知识介绍

      • 宗海 叶,伯俭 曹
        1981, 04(5)
        摘要：随着空间技术的发展，空间带电粒子的测量正迅速地向深度和广度发展。从近地空间的测量扩展到星际间的测量；被测粒子的能量已向高（几个GeV）、低（几十eV）端延伸；被测的粒子成分从电子、质子到Z≥30的重核；同位素丰度的测量已从氢扩大到硫；研究的领域也从宇宙线空间物理发展到宇宙线天文学。对带电粒子的成分、能谱、时间和空间变化，以及不同成分到达方向的测量，将为粒子的起源、加速和传播过程、寿命和动力学过程以及星际介质的性质提供信息；对同位素丰度的测量将提供源区核反应过程的性质等。  
          
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        发布时间：2022-08-16
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