最新刊期
      卷 0 ， 期 0 ， 2020
      • Issue 2, (2000)
        摘要：This article gives the method and result of measuring angular and radialdistributions of gamma’s energy deposition in scintillation optical fiber by numericsimulation of GEANT3 system.  
        关键词：GEANT3 system;Scintillation optical fiber;Energy deposition;Angular distribution   
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        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：The microstructure and defects of the plasma spraying Fe alloy coating that underwent a compression treatment were investigated by the positron lifetime analysis and hardness testing. A mechanism for increasing the density of the Fe alloy coating with compression techniques was suggested.  
        关键词：Plasma spraying;Fe alloy;Positron lifetime spectrum;Compression;Hardness   
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        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：The radionuclide monitoring data shall follow the safety and verification criteria based on the demand from international Radionuclide Monitoring Station by Comprehensive Test Ban Treaty. It was suggested that the activity and their ratio of 212Ph, 214Ph, 212Bi, 208T1 and some other radionuclides could be used for data verification criteria in aerosol sample collection. After using computer simulation,the minimum detectable concentration was given by different measuring time and different sampling flow rate.  
        关键词：Comprehensive Test Ban Trecty;International Radionuclide Monitoring Station;Verification;Authentication;Minimum detectable concentration   
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        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：The slow positron beam was used to study the defects in the MBE(molecular beam epitaxial) Si. The relations between the quality of the MBE Si and the growth temperature as well as the thickness were discussed. It is concluded that the optimum growth temperature for several-hundred-nanometer MBE Si is about 500℃; and if the temperature is too high (about 700℃ ), the enhanced diffusion of antimony will greatly effect the property of the Si material.  
        关键词：Molecular beam epitaxial Si;Defect;Slow positron;S parameter   
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        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：The procedures and methods for analyzing the medical 186Re sample by γ-ray measurement are described. The γ （X）-ray spectra for NH4ReO4 were measured, 186Re was identified by γ-ray energies and intensities in the spectra, the radioactive nuclide purity for 186Re was evaluated, the activities of the samples were determined in comparison with a standard source.  
        关键词：γ(X)-ray spectrum;186Re;Nuclide purity;Activity   
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        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：A simulated test for measuring the cement grog conveyed by chain-boxes conveyer with nuclear technology was conducted. It is shown that the relative error is greater as the quantity of materials inside chain-boxes is small, the relative error can be reduced to less than 1.1% for a fuller loading. In normal production condition,the measuring precision is less than 2%.  
        关键词：Cement grog;Nucleonic weighing;High temperature ionization chamber   
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        <引用本文> <批量引用> 7394125 false
        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：A Grignard reagent prepared from n-heptyl bromide was carbonated with the carbon-1-13C dioxide liberated from barium carbonate-1-13C and concentrated sulfuric acid. The octanoic-1-13C acid was obtained by acidic hydrolysis and purified by extraction. The yield was more than 90%. To analyze the structure and compute the 13C abundance of the octanoic-1-13C acid, various analysis of MS, IR, 1H-NMR and 13C-NMR were performed. According to the quality demand of the oral drug, the quantitative measurements of some metallic elements had also been carried out.  
        关键词：Octanoic acid;Carbon-13;Synthesis;Analysis   
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        <引用本文> <批量引用> 7394909 false
        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：The compton scattering of the polarized laser beam on high energy polarized elections can be used to measure the polarization of the electron beam from Beijing Electron Positron Collider(BEPC). Behavior of the BEPC polarimeter was studied through Monte Carlo simulation, and the result of simulation was presented.  
        关键词：Monte Carlo simulation;Polarization;Shower;Compton scattering   
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        <引用本文> <批量引用> 7394150 false
        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：Small cluster ions such as Bn+ （n = 2）, Cn+ （n < 10）, Stn+ （n = 2,3,4） and Aun+ （n= 2）have been accelerated to 1-4 MeV in the 3×2MV tandem pelletron of FudanUniversity （NEC 9SDH2）. Intensities of the MeV cluster beams ranging from 0.1 to100nA depend on the type of cluster ions and the number of atom it contains. The lowenergy negative cluster ions injected were obtained from a cesium sputter source（SNICS II）. The mass analysis of the high energy cluster beams was performed by aswitching magnet. The mass spectrum of the carbon cluster beam produced in thecollisions of C8- cluster ions with stripping gas molecules N2 indicates that there isan odd-even effect related to the carbon cluster styucture.  
        关键词：MeV high energy cluster beam;Carbon cluster;Tandem accelerator   
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        发布时间：2021-03-12
      • ZHANG Jiahua
        Issue 2, (2000)
        摘要：Based on a peculiar property of the Fifth Unstable Nuclide Series（FUNS） in developing stage, namely the transformation rate of parent fuel-238U consumption to fission production being increased with the fuel’s reactor core life, it was shown that the used fuel taken out from the reactor core of PWR could be used again as PWR fuel, and the post processing for the used fuel needed only to de-contaminate the fission Products from the used fuel and then to rebuild it into its normal form.Scheme A in the article discussed the condition of using such rebuilt used fuel in PWR. Another peculiar property of FUNS is characterized by the fact that the equilibrium saturate concentrations of the derived nuclides in FUNS are different for different types of reactor. It is well known that the saturate concentration of 239Pu in PWR is much larger than that in HWR. Scheme B in the article, i.e. a method of using the rebuilt used fuel from PWR to replace the natural uranium fuel for HWR,was discussed.  
        关键词：Fifth Unstable Nuclide Series;Transformation ratio;Fussion products decontamination;PWR;HWR   
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        <引用本文> <批量引用> 7394179 false
        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：The hemoglobins from normal adults (Gly-Hb 5%), people infected with diabetes (Gly-Hb 10%) and serious diabetics (Gly-Hb 15%) were investigated by Mossbauer spectyoscopy at liquid nitrogen temperature. All the experimental spectra of hemoglobin are composed of three doublets corresponding to oxy-hemoglobin (Oxy-Hb), deoxy-hemoglobin (Deoxy-Hb) and low-spin hemochrome (Ls-Hemo) respectively. It is found that Oxy-Hb is decreasing but Deoxy-Hb increasing for diabetes. Experimental results also indicate that the line-width of Mossbauer spectra of Oxy-Hb for diabetics is narrower than that for normal adults, showing that while Fe in Oxy-Hb exists in pile-up of some similar states for normal adults, bat it becomes in single state for serious diabetes.  
        关键词：Diabetes;Hemoglobin;Mossbauer spectra   
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        <引用本文> <批量引用> 7394951 false
        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：Described is a new screened type of extracting/accelerating system thataccelerates ion beam up to 1.1mA and 180kV based on the requirements of high-yieldneutron tube. The optimization of structure has been realized and a neutron yield ofmore than 1.5×10~10n/s has reached. The long-term practices prove this physicaldesign is rational and lays a foundation for developing neutron tubes with still higheryield.  
        关键词：Extracting/ accelerating system;Structure optimization;Yield   
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        <引用本文> <批量引用> 7394965 false
        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：A method of producing and accelerating radioactive nuclear beam 64Cu （off-line） at HI-13 Tandem Accelerator is presented. Some techniques are described including mounting and shielding the intensive radioactive 64Cu cathode target of Model 200 Cesium Spuder Ion Source, accelerating weak ion beam of 64Cu through HI-13 Tandem Accelerator, separating and distinguishing 64Cu ions, etc. As an initial result, 64Cu of 4 × 103 ions/s （80MeV） was obtained on the experimental target.  
        关键词：Off-line;Radioactive nuclear beam;Ion source   
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        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：186Re is produced from a reaction induced by 16MeV deuterons on isotopically enriched 186W metal powder target. Carrier-free 186Re saline solution is obtained through a seperation scheme of an alumina column followed by an anion exchange column. The experimental thick-target yield of 186Re is determined to be 19.57TBq/Ah. The isotopic impurities are found to be 186Re（5 × 10-3%） and 184gRe（4.6 ×10-2%）.  
          
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        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：By using the split-division techniques, the output of a detector is divided into two branches with different amplitudes. The two branches are calibrated directly and indirectly, respectively, to extend the dynamic range of the detector in order to meet the requirements of effectively detecting particles with a larger variation of particle density.  
        关键词：Scintillation counters;Particle density;Dynamic range   
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        <引用本文> <批量引用> 7394240 false
        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：A kind of high resolution X-ray detectors based on CCD array is reported. Thecharacteristics of CCD array are briefly introduced and the normally usedscintillation materials compared. Its data acquisition circuits are designed. A verygood spatial resolution was found when this kind of detectors was used in amicrofocal X-my computerized tomographic system.  
        关键词：Detector;High-resolution;Charge coupled device   
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        发布时间：2021-03-12
      • Issue 2, (2000)
        摘要：The Brownian motion of suspended particles of FeS2 in nematic liquid crystal EBBA at different temperatures is studied by Mossbauer spectroscopy. An effective particle model to give a semi-quantitative explanation of diffusion process of the suspended particles in nematic liquid crystal is proposed.  
        关键词：Mossbauer spectroscopy;Brownian motion;Nematic liquid crystal;Anchoring effect   
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        发布时间：2021-03-12
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