最新刊期
      卷 0 ， 期 0 ， 2020
      • HUANG Qunying
        Issue 8, (2000)
        摘要：Activation, dose rate and self-shielding effect of HT-7U device were calculated and analyzed by using one-dimensional discrete coordinate transport calculation code ANISN and the activation calculation code AFDKR with their data libraries based on one-dimensional model. Neutron spectrum, induced spectrum and their dose rate to the neighbour inhabitants and activity level were given and estimated.  
        关键词：HT-7U device;Activation;Dose rate   
        12
        |
        84
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204347 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：A concept has been proposed on the sub-critical nuclear system driven by a fusion neutron source, which can be used to produce fissile nuclear fuel and to transmute long-lived radioactive wastes as a way of early application of the fusion energy technology. The necessity and feasibility to develop that system in China are illustrated based on the prediction of energy source demand in the first half of the 21st century, the current status of nuclear energy supply and the progress in fusion energy technology develepment in the world. A scenario of development steps is also proposed.  
        关键词：Clear nuclear energy;Subcritical system;Fusion;Neutron source;Blanket   
        13
        |
        291
        |
        10
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204952 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：Calculation and analysis on radiation field around HT-7U Tokamak device under the condition of D-D discharge have been performed with the one dimensional discrete ordinate transport calculation code ANISN. The effects of concrete wall and borated water with different thicknesses on shielding have been analyzed. The spatial distribution of fluxes of neutrons and induced photons and dose rate equivalent can be used as a reference to the radiation protection design and environmental asscessment of HT- 7U device.  
        关键词：ANISN code;Tokamak;D-D discharge;Radiation field;Neutron;Photon   
        8
        |
        156
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204327 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：The distributions of neutron flux, r flux and dose rate at the neighbourhoed of HT-7U device are calculated and analyzed by using the two-dimensional neutron/photon transport code DOT3.5. Different shielding materials and their thicknesses are compared and optimized to give a reference to the shielding design of HT- 7U device.  
        关键词：DOT3.5 program;Tokamak;D-D discharge;Fusion;Radiation field;Neutrons;Photon   
        10
        |
        153
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204738 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：In this paper, taking nuclear fusion reactor as a research object, one novel design method guided by parametric component design and variational assembly logic relation is presented. The parametric design relates to such components as center conductor post, PF coil, TF coil, divertor cassette, blanket, shielding and vacuum pumping. The solid modeling technology is used for all design objects, which will give the users a 3-D visualization. The design system introduced in the paper shows a new design means for agile design of nuclear fusion reactor and will promote the design to a desper stage.  
        关键词：Reactor;Engineering design;CAD;Visualization   
        9
        |
        103
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204991 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：In this paper, the rheological properties of PP/SBS irradiated by rays were studied. The viscosity of irradiated PP/SBS was lower than that of unirradiated PP/SBS, which implied that the irradiated blends could be easily processed by injection molding. The effects of radiation on the segmental relaxation of PP/SBS were studied. The glass state temperature of PP and SBS became closer because of the irradiation.  
        关键词：Internal friction;SBS;Propylene(PP);r irradiation;PP/SBS;Rheology   
        9
        |
        108
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204370 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：P(AA-co-DMMAC) hydrogels were synthesized by γ ray irradiation polymerization. The pH value responsive behaviors of hydrogels with different monomer ratios of (DMMC:AA) was studied. When the ratios were 1:3, 1:4, 1:5, and 1:6, the response behaviors was similar. At pH=7, the gels had large swelling properties, while at higher and lower pH values, the swelling was smaller. The situation was reversed when the monomer ratio was 1:2.  
        关键词：Acrylic acid;DMMC;P(AA-co-DMMC);pH-respond;Hydrogels   
        8
        |
        119
        |
        3
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7205163 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：A set of narrow beam gamma ray TCT equipment is described. The whole system uses the software LabVIEW to control the motion, to acquire the project data and to reconstruct the image from the data. Relationships between resolution of the system and shift step and angle step are discussed. Some research work was done and the result was given.  
        关键词：TCT;Spatial resolution;LabVIEW   
        9
        |
        36
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7205008 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：Lead tungstate crystal (PWO), a key component of the electromagnetic calorimeter of CMS, must meet high quality requirements in order to attain the claimed energy resolution. The fluorescence properties and radiation hardness have been measured with some full size (23cm long) Sb doped lead tungstate crystals. The measurement methods are presented and the results are given.  
        关键词：Lead tungstate crystal;Doping;Radiation hardness   
        8
        |
        66
        |
        4
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204840 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：A pulse light source, guided through an optical fiber of 0.15mm, was used to test PSPMT R2486. The following results are obtained: (1) position linearity: absolute non-linearity of 0.63mm and differential non-linearity of 0.1mm; (2) gain non-linearity: ≤30%; (3) space resolution: 0.4mm.  
        关键词：PSPMT;Position linearity;Space resolution   
        10
        |
        139
        |
        8
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204412 false
        发布时间：2021-03-12
      • SUN Lazhen
        Issue 8, (2000)
        摘要：The physical process of 200MeV electron beam bombarded on Tungsten was simulated by Monte Carlo method. The optimum thickness of the electron-photon transfermation target is estimated to be 7- 9mm. It is shown that an 123I yield of 5.92MBq can be obtained or optimum retrieving time of 5.26h, with a 3MPa 124Xe gas target and 3h borobardment time.  
        关键词：Photon-nuclear reaction;Bremsstrahling radiation;Neutron-defect nuclei   
        8
        |
        76
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204714 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：The production of 123I via photonuclear reactions has been studied both theoretically and experimentally. A facility for producing 123I by photonuclear reaction on natural xenon at an electron linac of 200MeV in National Synchrotron Radiation Laboratory, USTC was established and described in the paper. Some research results, such as the 123I yield, γ -ray spectrum of iodine isotopes, nuclear purity, and chemical purity, were given. The experimental results show that 123I yield of 18.5GBq will be possible if average current is increased to 6 u A. a pure 124Xe (100%) target is used instead of the natural xenon and the gas target thickness reaches to 6g/cm2.  
        关键词：Photonuclear reaction;Radiopharmaceuticals;123I;Nuclear purity   
        9
        |
        88
        |
        5
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204930 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：To increase the beam lifetime to more than 600 minutes for the 800MeV/300mA storage ring in NSRL, some improvements on the vacuum system are necessary. The present condition of the vacuum system is analyzed and several important improvements to be brought about are described in detail.  
        关键词：Synchrotron radiation;Storage ring vacuum;Beam life-time;RF shield   
        8
        |
        38
        |
        2
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204401 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：The micro-tensile processes of Chinese-fir and Masson pine are studied by synchrotron radiation light (SRL). It shows that the patterns of crack propagation are different in tangential and radial tensile process. In the tangential tensile process, because of stress concentration near the crack, once the wood forms a crack, more cracks will occur. In the radial tensile process, crack appears in the standard specimen first mainly in the boundary of early wood and late wood. Usually it extends to early wood. Crack tip does not propagate under tension parallel to grain when the pre-cut crack is perpendicular to grain. On the contrary, small cracks perpendicular to grain form and gather near the pre-cut crack. Obviously sliding between tracheids and intercell failure is easier to happen than transwall failure.  
        关键词：Chinese-fir;Masson pine;Synchrotron radiation;Process of fracture   
        9
        |
        325
        |
        8
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7205034 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：Cadmium sulfide nano-particles with certain shapes have been sucessfully synthesized via r-ray irradiation in the non-water system. Absolute ethanol and a mixed solution of ethanol and benzene with the volume ratio of 1:1 are used as the solvents, and carbon disulfide and sulfur powders as the sulfur ions source, respectively. When the solutions are irradiated, carbon disulfide or sulfur element is reduced into S2- by the produced solvational electrons. CdS is precipitated through the combining reaction of S2- and Cd2+ ions. The investigation reveals that the phases and sizes of the products are affected by different solvents and sulfur ions sources.  
        关键词：r ray irradiation;Cadmitun sulfide nanocrystalline;Solvational electrons;Non-water system   
        9
        |
        108
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204827 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：This text reports the result of heart function examination with nuclide of 99mTc to 72 cases suffering from cardiovascular diseases: Heart function effected little by hypertension, only TPFR , phase angle of ventricle t, 27%- 66% cases with ventricle wall motion and amplitude abnormal. This effected by CAD more obvious, LVEF , 25%FF , 50%FF , phase angle of ventricle ; cases approaching 25%-51% with ventricle wall motion and amplitude abnormal. When CAD getting myocardial infarction(MI), the condition has worsened, such as LVEF , 25%FF , 50%FF , phase angle of ventricle t, 72%-94% cases with ventricle wall motion and amplitude abnormal. Further, when heart ventricle wall tumor occurs after a large area MI, the condition gets serious, LVEF , phase angle of ventricle t (> 120 degree), other targets getting bad, all cases with ventricle wall motion and amplitude abnormal.  
        关键词：Heart function examine with nuclide;Cardiovascular diseases;Gate heart blood pool image   
        9
        |
        55
        |
        1
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204354 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：A 4π multi-dectector array for measuring the charged particles in intermediate energy heavy ion induced reactions is described. It consists of 276 detector telescope units, each unit is composed of fast and slow plastic scintillator phoswiches, or fast plastic scintillator and CsI(TI) phoswiches or silicon detector telescopes. The array covers geometrically 85%-90% of the 4 π solid angle with low detection thresholds. The detecotrs, operated under vacuum, are axially symmetrically arranged around the beam line. 1,2,3H, 3,4He isotopes and elements from Li to Ar can be identified and their energies can be measured over a large dynamic range.  
        关键词：Multi-detector array;Plastic scintillator;CsI(TI) crystal   
        8
        |
        55
        |
        3
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204388 false
        发布时间：2021-03-12
      • Issue 8, (2000)
        摘要：The effects of N+ ion beam implantation on seed germinating rate and root-tip mitotic aberration rate for dry and sprouting seeds are compared. Results show that N+ ion beam implantation brought about obvious effects on sprouting seeds but little effects on dry seeds. Within the range of dose (0- 6x 1016/cm2), the mitotic aberrations of sprouting seeds induced by N+ ion beam implantation are higher than those of dry seeds, and they all increase with the increasing implantation dose; but when the implantation dose is higher than 6 x 1016/cm2, they all show some degree of saturation. Possible mechanism of aberration effects induced by N+ ion beam implantation is briefly discussed.  
        关键词：Ion beam implantation;Wheat;Dry seeds and sprouting seeds;Nuclear aberration;Chromosome aberration;Mitotic aberration;Mutagenesis mechanism   
        8
        |
        118
        |
        12
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 7204753 false
        发布时间：2021-03-12
      0