最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：Data archive system is the key part of HLS control system,it is used for archiving beam parameters,real-time equipment data,alarm records,etc.The Archive Engine of RDB Channel Archiver is used for collecting data from Input Output Controllers of HLS control system and storing in Oracle database.Webpages based on JSP are developed for data inquiry and statistics,with which the data processing and analyzing can be more efficient for operators and researchers.Thus the system can meet the requirements of the HLS machine operation and machine research.关键词：EPICS;Oracle;RDB Channel Archiver;JSP
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发布时间：2021-06-03 - 摘要：Benchmark experiment is an important means to inspect the reliability and accuracy of the evaluated nuclear data,the effect/background ratios are the important parameters to weight the quality of experimental data.In order to obtain higher effect/background ratios,a pre-collimator system was designed for benchmark experiment.This system mainly consists of a pre-collimator and a shadow cone.The MCNP-4C code was used to simulate the background spectra under various conditions,from the results we found that with the pre-collimator system have a very marked improvement in the effect / background ratios.关键词：Benchmark experiment;Effect/background ratios;Pre-collimator system;MCNP-4C code
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发布时间：2021-06-03 - 摘要：Neutron holography is an imaging technique permitting the three-dimensional reconstruction of the micro-structure of the original sample.This paper simply introduces the principles and developments of neutron holography.Based on the principle,the holographs and reconstruction procedure of an octahedral crystal lattice with H atom in the center are simulated by numerical method.Effects of some critical parameters such as statistical noise,wavelength of source neutrons,the angular step width and the detector acceptance angle are also investigated in this paper.The simulation method and results will be helpful for future work.关键词：Neutron holography;Numerical simulation;Parameter analysis;Ortho-octahedron lattice;Reconstruction
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发布时间：2021-06-03 - 摘要：According to dose parameters calculation formula of seed source recommended by AAPM TG43U1,125I-103Pd seed source dose parameters calculation formula and a variety of radionuclides composite seed source of dose parameters calculation formula can be obtain.Dose rate constant,radial dose function and anisotropy function of 125I-103Pd composite seed source are calculated by Monte-Carlo method,Empiric equations are obtained for radial dose function and anisotropy function by curve fitting.Comparisons with the relative data recommend by AAPM are performed.For the single source,the deviation of dose rate constant is 0.959（cGy.h–1.U–1）,and with 0.6093% from the AAPM.关键词：Monte-Carlo method;Dosimetric characteristics;125I-103Pd;Empiric equation
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发布时间：2021-06-03 - 摘要：Level 5 samples from radionuclide stations of the Comprehensive Nuclear Test Ban Treaty（CTBT） should be split and sent to two or more independent laboratories for measurement and analysis.The study is focused on the sample splitting method and the uniformity testing of split samples.Two sample splitting methods,filter cutting and sample compressing split,are introduced in this article.Uncompressed and compressed filter samples are split by using two methods.Then the split samples are measured by HPGe γ spectrometer.The results show that the split samples are homogeneous.This work establishes the split and test foundation of the radionuclide station and laboratory.关键词：Aerosol sample;Splitting;7Be;Uniformity
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发布时间：2021-06-03 - 摘要：To satisfy engineering requirements for mechanics performance of neutron shielding material,short carbon fiber was used to reinforce the traditional containing B4C neutron shielding material and effects of fiber content,length and surface treatment to mechanics performance of material was discussed.Based on Americium-Beryllium neutron source,material’s neutron shielding performance was tested.The result of experiment prove that tensile strength of material which the quality ratio of resin and fiber is 5:1 is comparatively excellent for 10wt% B4C of carbon fiber reinforced epoxy resin.The tensile properties of material change little with the fiber length ranged from 3–10 mm.The treatment of fiber surface with silane coupling agent KH-550 can increase the tensile properties of materials by 20% compared with the untreated of that.A result of shielding experiment that the novel neutron shielding material can satisfy the neutron shielding requirements can be obtained by comparing with B4C/polypropylene materials.The material has good mechanical properties and wide application prospect.关键词：Neutron shielding material;Short carbon fiber;Coupling agent;Composite
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发布时间：2021-06-03 - 摘要：In order to study the structure characteristic of the low permeable sandstone ore rock as well as the influence of the structure on the penetration ratio,this paper based on the mercury intrusion experiment to analyze the fractal characteristics of the pore and pore specific surface distribution in the low permeable sandstone uranium rock,and study the relation between the structure characteristic and porosity.The study indicates that there are double-fractal characteristics of the structure in the low permeable sandstone uranium rock,it mainly shows the fractal dimension value of the pore distribution and pore specific surface distribution is different with the pore of small and large aperture.The fractal dimension of the pore distribution with the large aperture ranges from 3.687 to 4.255,while that with the small aperture ranges from 3.101 to 3.208.And,the fractal dimension of the pore specific surface distribution with the big particle mass ranges from 2.910 to 3.151,and that with the small aperture ranges from 2.466 to 2.342,and that the relation between the porosity and the fractal dimension of the large aperture is positive correlation,but is negative correlation between the porosity and the fractal dimension of the pore specific surface distribution in the large aperture.关键词：Low seepage sandstone uranium ore rock;Pore structure characteristics;Mercury intrusion method;Fractal dimension
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发布时间：2021-06-03 - 摘要：Using Monte Carlo program BEAMnrc to simulate Siemens accelerator 6 MV photon beam,using BEAMdp program to analyse the energy spectrum distribution and mean energy from phase space data of different field sizes,then building beam source,energy spectrum and mono-energy source,to use DOSXYZnrc program to calculate the dose deposition kernels at dmax in standard water phantom with different beam sources and make comparison with different dose deposition kernels.The results show that the dose difference using energy spectrum source is small,the maximum percentage dose discrepancy is 1.47%,but it is large using mono-energy source,which is 6.28%.The maximum dose difference for the kernels derived from energy spectrum source and mono-energy source of the same field is larger than 9%,up to 13.2%.Thus,dose deposition has dependence on photon energy,it can lead to larger errors only using mono-energy source because of the beam spectrum distribution of accelerator.A good method to calculate dose more accurately is to use deposition kernel of energy spectrum source.关键词：Monte Carlo;Pencil beam;Dose deposition kernel;Radiation therapy;Linear accelerator
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发布时间：2021-06-03 - 摘要：A kind of inorganic ion-exchanger for cesium removal,zirconium molybopyrophosphate（ZMPP） was synthesized from ZrOCl2,Na2MoO4 and K4P2O7.The effect of ZrOCl2 concentration on the structure and ion-exchange performance of ZMPP was investigated.The microstructure of ZMPP was analyzed by FT-IR,TGA,XRD,SEM,etc.FT-IR spectra indicated that there were structural water and pyrophosphate groups in ZMPP samples.TGA curves showed that the structural water was gradually lost between 110°C to 590°C.XRD curves displayed that ZMPP samples were amorphous.SEM photos manifested that ZMPP were irregular grains in micron scope,and the surface became smooth after ion-exchanged with Cs+.ZMPP exhibited excellent acidresistivity.Concentration of ZrOCl2 did not evidently affect the structure of ZMPP,however,results of adsorption experiment showed that ion-exchange capacity would increase with ZrOCl2 concentration increases.In neutral system,when initial Cs+ concentration was 13.24 mmol/L,its ion-exchange capacity was up to 1.329 mmol/g.关键词：Zirconium molybopyrophosphate;Cesium;Ion-exchange capacity
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发布时间：2021-06-03 - 摘要：The different labeled glucose was synthesized when11C,13C,14C,D,3H or18O were introduced to glucose.Glucose is the essential nutrients in the organism metabolism,therefore,in the research of glucose metabolism and morbid diagnose,they provide people with a convenient and effective tracing tool.The paper mainly introduces the synthesis and the advances in clinic diagnoses,medicine,biology,pharmacology and chemistry of the isotope labeled glucose.关键词：Isotope;Glucose;Synthesis;Application
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发布时间：2021-06-03 - 摘要：To study pharmacokinetics of 99m Tc-PQQ ester（99m Tc-4,5-dioxo-4,5-dihydro-1H-pyrrolo（2,3-f） quinoline-2,7,9-tricarboxylic acid 2-ethyl ester 7,9-dimethyl ester） in the blood and the brain of mice with pharmacokinetics local model and vector analysis.99m Tc-PQQ ester can be used to image NMDA receptor.99m Tc-PQQ ester（0.2 mL,10 MBq） was injected through tail vein into the mice（18-22 g）,which were divided into 8 groups（five per group,one group for the blood and the other for the brain） randomly.10 μL blood samples were withdrawn from the tail vein at 5,15,30,60,120,180 and 360 min post-injection.The other groups of mice were sacrificed at the same time intervals post-injection,and tissues of the brain（thalamencephalon,hippocampus,frontal cortex,parietal cortex,temporal cortex,occipital cortex,pons and medulla oblongata,striatum and cerebellum） were removed and weighed.Radioactivities were counted with the γ-counter.Kinetic equations and parameters were calculated by pharmacokinetics local model,and pharmacokinetics data were studied by solution space and vector analysis method.Experimental data showed that 99m Tc-PQQ ester could accumulated in the hippocampus,frontal cortex and parietal cortex.According to the calculation of pharmacokinetics local model,kinetic equations were: hippocampus C=0.24e 0.0420t +0.28e 0.00446t,frontal cortex C=0.22e 0.0420t +0.27e 0.00446t,parietal cortex C=0.24e 0.0420t +0.21e 0.00446t,cerebellum C=0.23e 0.0420t +0.11e 0.00446t,occipital cortex C=0.17e 0.0420t +0.14e 0.00446t,striatum C= 0.11e 0.0420t +0.17e 0.00446t,pons and medulla oblongata C=0.10e 0.0420t +0.18e 0.00446t,temporal cortex C= 0.14e 0.0420t +0.14e 0.00446t and thalamencephalon C=0.14e 0.0420t +0.09e 0.00446t,respectively.Pharmacokinetics parameters of the blood were also calculated,k 12 0.0173 min 1,k 21 0.0096 min 1,k e 0.0196 min 1,CL 0.13 ID%g 1 min 1,AUC 753.68 ID%g 1 min,t 1/2α 16.50min and t 1/2β 155.35 min,respectively.There was a linear relationship between vector modules corresponding to brain tissues and the highest concentrations of 99m Tc-PQQ ester in the brain tissues,and the linear regression equation was y=1.3287x 0.0229,R 2 =0.9487.Results of solution space and vector analysis method indicated that kinetic action of 99m Tc-PQQ ester in the hippocampus,frontal cortex and parietal cortex was similar,and was different from that of the other brain tissues.The study of pharmacokinetics shown that 99m Tc-PQQ ester can accumulated in some brain tissues of mice,such as hippocampus,frontal cortex and parietal cortex.The favourable uptake and suitable retention in these brain tissues confirmed that it can combine with NMDA receptor in vivo.关键词：99mTc-PQQ ester;NMDA receptor;Imaging agent;Pharmacokinetics local model;Vector analysis
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发布时间：2021-06-03 - 摘要：This paper reported the new technology on controlling the minority carrier life time of fast diode by using high energy 12 MeV electronic radiation,discussed the influence of high-energy electron irradiation to the device’s reverse recovery time trr and positive peak pressure drop VFM,and studied the nature of the defects’ energy level.Application results show that the defect level introduced by irradiation directly cause the VFM and trr’s change,this technology can successfully replace the traditional technique of gold doped process,and have a lot of advantages such as high control precision,high consistency of trr and VFM,repeatability,high percent of pass and simple process,so this technology has promising future.关键词：Electronic irradiation;Minority carrier lifetime;Reverse recovery time;Positive peak pressure drop;Defect level
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发布时间：2021-06-03 - 摘要：We successfully prepared the composites possessed high magnetic properties and shielding effectiveness（SE） in RF band with the methods of loading iron nitride nanoparticles on expanded graphite（EG） by the gaseous reduction and nitridation.XRD measurement shows that the ferric phases changed in different nitridation temperature.The phase components of nanoparticles were analyzed in detail by the measurement of 57Fe M ssbauer spectra.The result shows that as the temperature increased,the Fe particles were gradually nitride until completely before 400°C and the γ-Fe4N was gradually converted to ε-FexN（2<x<3） in iron nitride after 400°C关键词：Iron nitride;Expanded Graphite;M ssbauer spectra
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发布时间：2021-06-03 - 摘要：An extraction system with annular centrifugal extractors has been designed to separate plutonium.It worked well when centrifugal speed was ranged from 2000 to 8000 r/min and organic-aqueous flow ratio（o/a） ranged from 1/3 to 1,without obvious entraining phenomenon.Pu（IV） in 6 mol/L HNO3 solution was fast extracted and separated,using 0.1 mol/L TOPO/Cyclohexane as extraction solvent and 0.01 mol/L oxalic acid as back extraction solvent.The extraction ratio of two stages was larger than 90%,and the back ratio per stage was more than 96%.The extraction system shows fast operating speed and high extraction ratio,therefore it is suitable for fast extracting Pu.关键词：Centrifugal extractor;Plutonium;Fast extract;Separate
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发布时间：2021-06-03
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