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      2020 年 第 0 卷 0 期

        综述

      • 汉生 金
        1981, 04(4)
        摘要：近年来的实验事实表明，在GeV能区，沟道效应和阻塞效应仍然很好保持，而且，它们有可能在高能物理实验中得到一些有意义的应用。  
          
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        发布时间：2022-08-16

        科研成果报告

      • Cao Dexin,Zhu Dezhang,Zhou Zuyao,Hu Jiazeng,Dai Renzhi,Zhou Shichang
        1981, 04(4)
        摘要：Channelling Rutherford back-scattering technique has been used to investigate silicon crystals implanted with 40~150keV As ion to doses of 1×1015~1×1016/cm2. After thermal annealing at 600℃, 700℃ and 850℃, it was unsatisfactory to eliminate implanted damage. But the damage disappeared satisfactorily after pulsed Ruby laser annealing. 90% and 95% As atoms were in substitutional sites after thermal annealing at 900℃ and pulsed Ruby laser annealing, respectively. At the same time channeling dip of As atoms was 0.2° narrower than that of the Si atoms for thermal annealing, but they were the same for laser annealing.  
          
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        发布时间：2022-08-16
      • Xu Junshan,Zhou Zhuying,Guo Zhendi,Xu Zhiwei,Zhao Guoqing
        1981, 04(4)
        摘要：An automatic control system with microprocessor is discussed. It is mainly used in channelling experiments for turning the target. Checking the beam current integrator and data acquisition in the multichannel analyser in order to let the experiment be carried on automatically.A program is designed for selecting the turning angles, the number of repeated cycles, the measurement duration and so on. In this system a ET3400 microcomputer with a MOTOROLA 6800 microprocessor is used.  
          
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        发布时间：2022-08-16
      • Zhu Jieqing,Le Anquan
        1981, 04(4)
        摘要：An α-ray thickness gauge has been designed for the purpose of thickness measuring of ultra-thin °foils (0~4mg/cm2) made of any material. The precision is better than 1.5%. By using air equivalent method, it is possible to measure samples in the air to simplify the instruments used and to obtain higher precision. A semi-empirical formula for the relative mass stopping power as a function of Eα, Z and A has been derived. The divergency between the results from the formula and the data from Ziegler's table is less than 8%.  
          
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        发布时间：2022-08-16
      • Ma Jimao,Bai Jingzhi,Du Yunhe,Chen Chaoqing,Wu Zhendong,Gao Shuqi,Xie Peipei,Yan Jie
        1981, 04(4)
        摘要：A readout system for a multiwire proportional chamber is described. It consists of preamplifiers, discriminators, modules of memory, marks, encoders and wire chamber interface, CAMAC crates etc. The preamplifiers are mounted on the multiwire proportional chamber directly and the others are mounted in the CAMAC crates. Data from wire chamber interface Via a CAMAC system were sent into a computer for on line or off line analysis. This system can handle information up to 2800 wires.  
          
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        发布时间：2022-08-16
      • Wang Gongqing,Liu Jingyi,Xiao Genlai,Liang Yusheng,Lu Shangnu,Zhang Yiping
        1981, 04(4)
        摘要：The absolute efficiencies were calibrated between 60~3500keV for Ge (Li) detector by using 75Se, 152Eu, 56Co and calibrated sources 113mIn, 60Co. Cubic spline function have been served as functional fit to interpolate the 33 experimental points. The uncertaincy in absolute photopeak efficiency is within 4%.  
          
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        发布时间：2022-08-16
      • Ye Lianghua,Mei Zhoulei
        1981, 04(4)
        摘要：The effect of γ-ray pre-irradiation on enzymatic hydrolytical reaction of cellulose was investigated. The enzymatic hydrolysis of waste saw dust by cellulase was accelerated by pre-irradiation. Its yield of reducing sugar was increased with radiation dose. The relationship between the yeild and radiation dose was shown as a function of time of hydrolysis. Chemical analysis of irradiated saw dust showed that the α-cellulose of higher molecular weight was degradated completely to products of lower molecular weight. By determination of polymerization degree of irradiated cotton,it was shown that molecular weight of cellulose was decreasing rapidly after total dose reaching 106 rad. It could be concluded that the pre-irradiation treatment of cellulose waste has a significant accelerating effect on its afterward enzymatic hydrolytical reaction. This might be attributed to reduction of molecular weight and increase of solubility of cellulose.  
          
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        发布时间：2022-08-16
      • Ye Yifang,Hua Ruoling,Zhou Zhentang,Wang Yun
        1981, 04(4)
        摘要：Three 11C-carboxyl-labelled Amino acids——Valine, Leucine and Amino cyclopentane carboxylic acid were prepared by modified Bücherer-Strecker method. With 11C-sodium cyanide as starting material, the reaction was accelerated under high temperature and high pressure. The synthesis and purification was completed in fifty minutes. The influence of reaction temperature on yield of Amino acids was investigated. The purity of Amino acids were determined by paper chromatography. Both chemical purity and radiochemical purity were over 95%.  
          
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        发布时间：2022-08-16
      • Zhou Qingbao,Wu Yusheng,Zhou Baogui,Liu Xiujie
        1981, 04(4)
        摘要：The widespread use of radionuclides in clinic and research stimulates searching for new methods of cleaning the contaminated utensils.In this experiment, a 250W ultrasonic scrubber was used. Contaminated utensils was cleaned in detergent solution for 5 min. Then washed by water for 5 min. The results showed that the decontaminating method is effective and economic and eliminate unnessary exposure to ionizing radiation. But it is not satisfactory for that of 193Au contaminate gloves and remained to be improved.  
          
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        发布时间：2022-08-16
      • Zhu Shoupeng,Jiang Ji
        1981, 04(4)
        摘要：The purpose of the present study was to observe the localization of 14C-permethrin by means of freezing autoradiography. 14C-permethrin was administered to rats via stomach tube. The dynamic distribution of radioactivity in cellular level showed that this drug was first accumulated in the hepatic cells and glomerulus of kidney, and then concentrated in fat cells.14C-permethrin could be excreted rapidly. It could be observed that after 24 hrs. the silver grains of cells autoradiography were markedly decreased. With the exception of fat cells where 14C-permethrin was shown to be accumulated as amount of silver grains was increased, and then excreted gradually.  
          
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        发布时间：2022-08-16
      • Gao Mili,Zhong Darning,Sun Liting,Cheng Jie,Zhang Lianping
        1981, 04(4)
        摘要：Trace uranium in plants, soils, and phosphate fertilizers was determined with the method of fluorescence analysis. The recovery of the procedure for 1 µg of added. uranium is 74%. The detection limit of the fluorophotometer is 5×10-10g, with a precision of 5%. The sensitivity of the method is 7.5×10-9g for 1g of ash of plants, 6.4×10-9g for lg of soils, and 1.2×10-8g per g for 0.1g of phosphate fertilizers. The time required for determining three parallel samples is about 6 hours.  
          
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        发布时间：2022-08-16

        来稿摘登

      • 子丽 郭,若苓 华,其元 沈,秀芳 高,庆义 彭
        1981, 04(4)
        摘要：去甲肾上腺素是一种重要的交感神经类物质。在研究它的代谢和针麻原理的过程中，都需要高比度的氚标记物。本文介绍了以去甲肾上腺酮盐酸盐为原料，5%钯-碳为催化剂，50%甲醇水溶液为溶剂，用氚气直接还原成DL-[7-3H]-去申肾上腺素盐酸盐。其反应式如下：  
          
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        发布时间：2022-08-16
      • 锡麟 蔡
        1981, 04(4)
        摘要：所谓“核子筛”是在加速器上用重离子束制备的一种特殊塑料过滤膜，该技术是于1976～1979年间在串列加速器上发展起来的，属于重离子束应用范围。  
          
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        发布时间：2022-08-16

        工作简报

      • Zou Zhiyi,Xu Mingjuan,Huang Jianming,Mao Yu,Chen Miao,Zhang Shaorong
        1981, 04(4)
        摘要：A duoplasmatron for multiple charged ions is described. The construction of the ion source and experimental results are given. The ion beam of He2+, B2+, N2+ and Ar2+ up to tens microampers have been obtained.  
          
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        发布时间：2022-08-16

        知识介绍

      • 志仁 陆
        1981, 04(4)
        摘要：硅胶作为一种气体吸附剂，特别是干燥剂是早已为人们所熟悉和了解的。但是，硅胶吸附还能应用于放射化学分离。在早期的核燃料后处理的工艺流程中，曾用硅胶吸附法除去裂变产物放射性锆和铌，以纯化铀或钚的产品。近年来，在放射化学分离中使用硅胶的兴趣明显地增加了，有关硅胶的吸附性能研究以及它的应用的报道增多起来，成为一种比较引人注目的放射化学分离方法。  
          
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        发布时间：2022-08-16

        简讯

      • 培周 王
        1981, 04(4)
        摘要：目前国内不少实验室用FJ-353G1型双道液体闪烁计数器测量14C放射性强度，用以计算地质年代，由于射线强度较弱，测量时间需要比较长，因此如用打印机来记录测量数据，就可以方便测量。但本仪器没有与打印机联接的线路，所以需要自己动手做一个线路，使之与打印机很好的连接。  
          
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        发布时间：2022-08-16
      • 学诗 陈
        1981, 04(4)
        摘要：槐果碱（Sophcarpine）是从西亘根（Sophoraalopecuroides L.）中提取的一种生物碱，在临床上治疗恶性葡萄胎、绒毛膜上皮癌，近期治愈率为87.6%，对急性白血病亦有一定的缓解作用。槐果碱对小白鼠淋巴肉瘤、S180、S37、V14等肿瘤均有抑制作用。但槐果碱对核酸合成有何影响尚未见有报导。本文研究了不同剂量水平槐果碱对3H-胸腺嘧啶核苷掺入艾氏腹水癌细胞脱氧核糖核酸的影响及核酸含量的变化，以期阐明其抗癌作用原理。  
          
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        发布时间：2022-08-16
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