最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 12, (1996)
        摘要：The radon（222Rn）concentration and γ-ray,radiative intensity have been measured in X Hollow,Shandong.A few of oil and gas deposits are traped according to their anomalies.Results Show that these methods can be widely used in oil and gas exploring survey in the future.  
        关键词：Oil and gas deposit;Radon concentration;Solid state-nuelear tracks detector   
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        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：The correlation between dose and amino group survival in 30keV nitrogen cation irradiation of threnine was studied under the condition of adding or not adding radical eliminator.It is assumed that an implanted nitrogen ion is deposited in the sample as an amino group and a mathematical correlation of the dose-survival is obtained,with which the experimental data can be satisfyingly explained.Some of the incident ions were found to be reacted with samples through radicals according to the analysis of experimental data.  
          
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        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：In the gamma ray measuring systems,the drifting problems of gamma ray spectra caused by the factors such as temperature variance, long measuring period and so on have been studied. Based on the steady energy and shape of a gamma photopeak,a method of searching peak and stabilizing spectrum is presented.Considering the photopeak as a criterion and the discriminating threshold as an adjustable object,the system is operated directly on the energy orientation of the energy windows measured,to ensure the stability of relative energy of the windows.  
        关键词：Gamma ray spectra;Stabilizing peak;Energy windows;Threshold value   
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        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：ynthesis of 3H-labelled bilirubin is described.3H-bilirubin is prepared by the reduction of biliverdin using sodium boro-[3H]-hydride in methanol solvent.But biliverdin is synthesized through dehydrogenation of bilirubin with 2, 3-dichloro-5,6-dicyanobenzoquinone（DDQ）in dimethyl sulphoxide and sodium boro-[3H]-hydride is produced by exchange of sodium boro-hydride with tritium gas using nickel catalyst at high temperature.The specific activity of obtained 3H-bilirubin is 306GBq/mmol,while the radiochemical purity is over 95% by HPLC and paper chromatography.The permeatied profile of 3H-labelled bilirubin in rat brain has been satisfyingly obtained in animal experiments.  
        关键词：Tritium labelling;Bilirubin;Biliverdin;Sodium boro-[￣3H]-hydride   
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        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：１９９６年全年分类主题索引用页Ａ１３．１０固体与流体物理学的核现象与核技术在束穆斯堡尔实验装置…………２８５用正电子湮没技术研究深低温下Ａ卜ｈ－ＣＵ－Ｍｇ—Ｚｒ合金中的缺陷和电子密度··３１６０用正电子湮没寿命技术研究掺杂的ＩｎＰ……７３９５粒子关联...  
          
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        发布时间：2021-04-09
      • Chen Jingzhong
        Issue 12, (1996)
        摘要：X-ray stray radiation dose levels in the therapy rooms of 6 medical electron linear accelerators working at 6, 8 and 18 MV,respectively,have been measured using FARMER 2570/1A dosemeter and FJ 347A X γ dosemeter. The results show that the stray radiation doses at not less than 1 meter to the isocenter in the patient plane are not more than 0.1% of primary beam dose at the isocenter. The variation of stray radiation dose with the distance to the isocenter in the patient plane is found to follow the law of inverse square of the distance.The radiation dose evaluated with the inverse square distance law generally agrees with the measurement values within a factor of 2.  
        关键词：Stray radiation;Dose;Medical electron linear accelerator;Therapy room   
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        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：A review is given for some aspects of research work in radiation treatment of waste water and sewage sludge in the world within more than twenty years,includes radiation decomposition of phenol and cyanides,radiation removal of heavy metals,radiation decolorization of dyes and celluloses,as well as radiation sterilization of drinking water from various origins.Research on radiation treatment of sewage sludge and its practical application are also reviewed.  
        关键词：Radiation;Waste water treatment;Sewage sludge;Environmental protection   
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        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：An interface circuit for nuclear spectra data has been developed.The interface,supported by a simple circuit and matched with a corresponding software,can realize fast data acquisition.To cope with the random fluctuations of nuclear events,a multi-sequence derandomizing channel is adopted to increase the acquisition rate.  
        关键词：Derandomization;Nuclear spectra data acquisition;Interface circuit   
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        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：This paper presents the experimental method and result on observation of a new isotope 239Pa.The 239Pa was produced by 50MeV/u neutron-rich projectile（18O）bombarding natural uranium through exotic multi-nucleon transfer reactions.The new heavy neutron-rich nuclide 239Pa was identified for the first time by using chemical separation and observing the decay of 239Pa was determined to be 106 ± 30min. In addition, four decay γ-ray of 239Pa as well as its daughter 239U,the half-life of 239Pa with energy 522.0,562.0.638.5 and 681.0 keV respectively have been found.  
        关键词：Heavy neutron-rich nuclide;Multi-nucleon transfer reaction;Chemical separation;Identification   
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        <引用本文> <批量引用> 8411305 false
        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：The pure LiF crystals were irradiated by 60Co γ-ray with irradiated dose in the range from 0.99×103 to 1.38× 106Gy.The positron lifetime spectra were then measured using a fast-slow coincidence system.The second lifetime component τ2and its intensity difference △I2 were presented. When the irradiated dose D<1 ×104Gy,τ2 is essentially unchanged,while the △I2 is directly proportional to D1/2.Therefore △I2∝NF can be derived since the concentration of F-center NF is also directly proportional to D1/2.As the dose increases futher,the τ2 is increased but the increase of △I2 is very slow till saturation.  
        关键词：LiF single crystal;Color center;Positron lifetime   
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        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：The formulation,mixture and irradiation technique have been studied for the F40radiation crosslinking wire used in aircraft.The F40 matrix,sensitizers and flame retardant etc. are selected properly.After the radiation treatment with a dose of 90120kGy,a crosslinking wire corresponding to the MIL-W-22759/34 Standard is obtained.  
        关键词：F40;Radiation crosslinking;Wire   
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        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：The influence of the 1st,2nd and 3rd harmonic magnetic field on particle’s movement in the mini-cyclotron has been studied.The permitted upper limits for each harmonic part are calculated.These data provide a theoretical reference for magnetic trimming.  
        关键词：Mini-cyclotron;Magnetic field;Harmonic   
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        <引用本文> <批量引用> 8411349 false
        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：A beam profile monitor using synchrotron light in the storage ring at NSRL and advantages of this technique are described. The error analysis of the system is also made.  
        关键词：Storage ring;Synchrotron light;Electron beam profile   
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        <引用本文> <批量引用> 8411360 false
        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：A technique of polarization analysis for particles produced in relativistic heavy nucleus-nucleus collisions is described.It is shown that the analysis system is reliable and the obtained physical results are reasonable.  
        关键词：Relativistic nucleus-nucleus collisions;particles;Spin direction;Transverse momentum;Transverse polarization   
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        <引用本文> <批量引用> 8411371 false
        发布时间：2021-04-09
      • Issue 12, (1996)
        摘要：The vacuum protector providing high quality of safety for high power klystrons is reported. The response time of the device is less than 15ms. It can work reliably at the klystron corridor with strong electromagnetic interference.  
        关键词：Electron LINAC;Klystron;Vacuum protection   
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        发布时间：2021-04-09
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