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      卷 0 ， 期 0 ， 2020
      • Haoyuan Shen,Helian Lin
        Vol. 06, Issue 3, (1983)
        摘要：This paper describes a method of preparing a high resolution coaxial Ge (Li) detector by using native germanium single crystal. By performing some improvement on techniques, the best result of the coaxial Ge (Li) detector with sensitive volume 78cc has been obtained, the resolution of the divice is 2.0 keV for 60Co 1.332 MeV γ ray and P/C is 33.6:1. The fabrication techniques of the detectors have been proved to have a feature of a good repeat stability and high production rate.  
          
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        发布时间：2022-09-13
      • Zhiheng Chen,Dongchu Lu,Zhongliang Lu,Junfang Li,Zhenyou Wang,Yinshun Zhang,Yaozong Fu
        Vol. 06, Issue 3, (1983)
        摘要：This paper describes a Balloon method for the measurement of radon and thoron in environment. The absolute efficiency was calibrated by a standard radium source and compared with the activated charcoal absorption method. The sensitivity for measurement of radon is rather high (1×10-14Ci/l) and quick (the measurement can be done within 25 min.). The sensitivity for measurement of thoron is 1×10-13Ci/l. The installation is simple, and the method is suitable to measure the concentration of the radon and thoron in environmental air.  
          
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        发布时间：2022-09-13
      • Qi Chen,Limin Zhang,Guangcai He,Jie Sun,Zekun Fu,Zhengbin Zuo,Ping Wang
        Vol. 06, Issue 3, (1983)
        摘要：In order to use the liquid scintillation counter for the bacterial radiometric assay, a modified metabolism-scintillation vial was designed and a new scintillation trap system was tried. With this assembly good counting effeciency was obtained (>60%) and larger amounts of medium (8~10ml per vial) was held. Generally, it can be detected after 2~4 hour incubation with inoculum (salm. enterilidis, E. coli, Staphy. aureus, B. cereus) of 104~105/ml. In radiometric measurement of bacteria some influencing factors (e. g. type of metabolism-scintillation vial, concentration of bacterial inoculum etc) were investigated. The growth index exceeding 3 with liquid scintillation technique could be considered as positive reading of bacterial growth.  
          
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        发布时间：2022-09-13
      • Jianming Xiao,Xijun Sun
        Vol. 06, Issue 3, (1983)
        摘要：This paper describes a plastic scintillator telescope system which consists of a ∆E and E detector, a fast-slow coincidence dircuit and a multi-channel analyzer. The system was designed for measuring the high energy β+ particles emitted by short-life neutron-deficient isotopes produced in the heavy ion reaction and transported by the He-jet technique. It has been widely used to measure the β spectra for the purpose of calculating , log ft and Qβ values in the study of nuclides far from β-stability line.  
          
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        发布时间：2022-09-13
      • Linzhou Wang,D. I. Meyer
        Vol. 06, Issue 3, (1983)
        摘要：A Cerenkov counter employing the far ultraviolet region of the spectrum to photoionize benzene in a proportional chamber has been built and successfully operated. The counter has been tested up to 16 atmospheres of pressure for use as a Pi-K separator. The principle, structure and operation of the counter are described.  
          
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        发布时间：2022-09-13
      • Hanchen Luo,Zuhua Wang,Jiaqi Xu,Shoufen Zhu
        Vol. 06, Issue 3, (1983)
        摘要：The measurement of left ventrical ejection fraction (LVEF) is of great significance in clinical diagnosis, therapeutic evaluation and prognosis of heart diseases.Since the instruments designed before for LVEF measurement usually bear arrhythmic error they are unsuitable for examining patients with arrhythmia. This paper presents a device with the said error eliminated by introducing two gated signals tracing automatically the end of systole and distole.Consequently, it improves the precision of measurement augments the field of application.  
          
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        发布时间：2022-09-13
      • Jinchang Qian,Xingzhi Zhang,Zhenguo Li
        Vol. 06, Issue 3, (1983)
        摘要：The paper describes the operation principle and the basic method for measurement on phase and time structure of cyclotron beams by RF-γ time of flight method in the 1.2m variable energy cyclotron at the Atomic Energy Institute. The experimental results are presented and analyzed briefly.  
          
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        发布时间：2022-09-13
      • Yongjian Li,Dequn Shen,Fasheng Fan,Qixun Sun,Yongchuan Wang,Qianmei Ji,Yunxia Lan,Zhaoyi Zhao,shouqing Weng,Weiyu He,Jiexi Lu,Xingen Yu,Lanping Yang
        Vol. 06, Issue 3, (1983)
        摘要：This paper describes a new process for the production of Na 123I radiopharmaceutical through 121Sb (α, 2n) 123I reaction. Target of natural antimony was electroplated in a HF bath on a silver-copper complex plate. The antinomy layer thus obtained was firmly bound and evenly distributed with definite thickness and good thermal conductivity. The targets were irradiated by α particles of ~ 30MeV to produce 123I which transformed directly into pure Na123I radiopharmaceutical through a quick dry process of high efficiency. The total time of processing was within an hour. The overall radiochemical yield was over 98% with radionuclidic purity over 98.5%, radiochemical purity over 98%, chemical impurities of Cu and Sb all less than 1ppm. The thick target yield was around 0.3mCi/μAh. The product proved good in preclinical tests for injection, in-vivo uses and labelling of organic radiopharmaceuticals.  
          
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        发布时间：2022-09-13
      • Xunshi Zhang,Renqing Guan,Zemin Huang
        Vol. 06, Issue 3, (1983)
        摘要：When γ ray penetrates a substance, its intensity will be weakened with the increase of the thickness of the substance. When the cavitation flow is measured the absorber is the mixture of water and vapor and the relation between the impulse counting rate N of the counter and vapor thickness can be expressed as follows:N=N0'eμwdgN measured by the meter could show the status of cavitation flow. The present test was conducted on a Venturi Meter and a model hydraulic turbine. The test results were compared with the results of the supersonic method and the energy method. The instrument has shown to be practically stable and easy to operate. The application of cavitation measurement is feasible.  
          
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        发布时间：2022-09-13
      • Shiyu Luo,Mingzhu Shao
        Vol. 06, Issue 3, (1983)
        摘要：The non-linear differential equation and the oscillation frequency were solved using the Jacobi elliptie function and complete elliptic integral of the first kind and the particle spatial and momentum distribut ions were derived from phase space density.  
          
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        发布时间：2022-09-13
      • Xiane Lu,Fengying Liu,Shiping Chen
        Vol. 06, Issue 3, (1983)
        摘要：The relative efficiency of 130cm3 and 100cm3 spectrometers was measured using 133Ba, 169Yb, 75Se, 110mAg, 152Eu, 182Ta and 56Co multi-peak γ ray sources. The energy range is from 66keV to 3450keV. The relative efficiency experimental data were mormalized and fitted by orthognal polynomial. The uncertainties of the relative effcieney curves were about ±1% between 300keV and 2000keV, and about ±2% outside this region.  
          
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        发布时间：2022-09-13
      • Zhiyi Zhou,Xiaofeng Zhao,Jianming Huang
        Vol. 06, Issue 3, (1983)
        摘要：A simple device for increasing neutron target life-time is described. Two sets of magnetic poles excited by the phase quadrature 90°, 50Hz power supplies were used to scan the ion beam. The Ti-T target half life-time can be increased by a factor of 4~5.  
          
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        发布时间：2022-09-13
      • Lasheng Luo,Shimei Zhang,Zhiping Zhang
        Vol. 06, Issue 3, (1983)
        摘要：Graft copolymerization of tertra-fluoro-ethylene onto semi-vulcanized butadiene acrylonitrile rubber was carried out by pre-irradiation with 60Co γ rays. The monomer of tertrafluoro-ethylene was obtained through degradation of its polymer. Typical results of the copolymerization was tabulated.The mechanical properties of butadine acrylonitrile after copolymerization copolymer changed insignificantly. The coefficient of friction of rubber, however, decreased conside-rally with increase of graft percentage.  
          
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        发布时间：2022-09-13
      • Deyuan Lu,Jinying Wang,Zhongxian Ye
        Vol. 06, Issue 3, (1983)
        摘要：125I-DNA is a labelled compound of significance to biology, immunology, pathology clinic diagnosis and the study of therapeutic effects. The methods of preparatiag 125I-DNA by iodination with iodine chloride, N-iodosuccinimide, thallium trichloride and incorporating 125I-UdR into DNA in E. coli cells are not satisfactory. 125I-DNA described in the paper was prepared by a method using thallium oxide. It had a labelling rate of 30~60% with 125I-DNA specific radioactivity about 10µCi/µg, and of good purity (Radioactive impurity being less than 1%). This method is simple and practical.  
          
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        发布时间：2022-09-13
      • Institute of Nuclear-Agricultural Science Zhejiang Agricultural University,Department of Animal Husbandry and Veterinary Zhejiang Agricultural University,Livestook Breeding Station, Ever-Green People's Commune, Hangzhou
        Vol. 06, Issue 3, (1983)
        摘要：The concentration of progesterone contained in milk was determined by RIA, and it serves as an index of pregnancy. Milk was sampled at 21~23 day after breeding. The criteria of diagnosis are as follows: below 8ng/ml progesterone milk the cow is not pregnant; above 11ng/ml the cow is pregnant; and between 8~11ng/ml, it is doubtful.By using of these criteria, the percentage of diagnostic effectivenesses were 100 for non-pregnency 85~90 for pregnancy. The reagent used was paved domestically.  
          
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        发布时间：2022-09-13
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