最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：The absolute emission yields of photon-induced electrons from Al, Fe, Cu, Ta and W foils have been measured by the improved Millikan’s method to detect the photoelectric current in the incident direction. The experimental results show that the yield of photoelectron is decreased with the increasing of the foil’s thickness and there are more radiation-induced electrons emitting from the higher Z materials. A model known as " contribution of range layer" has been suggested. The calculated yields based on the model agree with the experimental data with a relative error of 10% on the average.关键词：Transmissive direction;Photon-induced electrons;Emission yield
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发布时间：2021-04-09 - 摘要：The blasting- ball treatment, as a modern general technology of surface strengthening, is introduced. The technology is helpful to improve fatigue strength and resistance to SCC and wearing for some materials. In nuclear power engineering the technology is important for it is suitable for a variety of complex structures, environments and materials as well as being applicable on line.关键词：Blasting-ball treatment;Nuclear power facilities;Service life
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发布时间：2021-04-09 - 摘要：MENG Bonian （China Institute of Atomic Energy,Beijing 102413） Abstract The relationship between content of the measured elements and area of typical peaks of prompt Y - rays is presented. The root- mean square errors on both the regression, value of instrumentation analysis and chemical analysis for some common elements are lower than 0.5wt%. Function of the slowing body was found and analysis sensitivity was enhanced obviously in the iron ore analysis. The FWHM of the spectrometer for the H prompt Y - ray peak （2.223MeV） is 3keV.关键词：Neutron- capture prompt Y - ray;Element analysis;On- line measuremernt
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发布时间：2021-04-09 - 摘要：The dependence of collision dynamics between C60 and a hydrogen-terminated diamond（111） surface on the impinging energy of C60 has been studied by means of molecular dynamics simulations. The Brenner potential has been used to describe the interaction between atoms in the system composed of carbon and hydrogen. It is found that the C60 molecule is reflected intact at energies up to about 200eV. For medium impact energies, chemical reactions may occur. The formation of bonds between C60 and the surface of the target has been observed at energies about 300eV. Furthermore, the present study provides a microscopic explanation of the collision process and gives insight into the deposition mechanism of C60 on substrates.关键词：C60 cluster;Hydrogen-terminated diamond（111 ） surface;Surface collision
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发布时间：2021-04-09 - 摘要：Behavior of the irradiation donor（ID） after annealing in NTDCZSi has been studied by using various kinds of experimental means and the effect of neutron doses and oxygen concentration on the formation of ID is discussed. The donor plateau generated in heat treatment below 750℃is reported for the first time. The results show that ID produces a shallow donor energy level （- 43meV） in the forbidden band. Its electric activity originates from the interface state of Si/SiOz precipitate and its structure is metastable complex which consists of irradiation defects, silicon, silicon dioxide and carbon.关键词：Czochralski grown silicun（CZSi）;Neutron transmutation doping;Donor effect
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发布时间：2021-04-09 - 摘要：A weak current amplifier and output circuit with a maximum nonlinear error of ±0.06% has been developed. Experiments show that it can work stably and therefore be used in nuclear industrial instruments.关键词：Weak current;Output circuit;Nonlinear error
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发布时间：2021-04-09 - 摘要：A simple technique of directly labelling antibodies with Re has been developed.The reduction of antibody disulfide groups was achieved by incubation of antibodywith ascorbic acid （pH=6.5）for an hour at room temperature and a solution of excessSnCl2 in sodium gluconate was added to the AA-reduced antibody followed by theaddition of perrhenate,Some factors that influence labelling efficiency,such as thepH of the reaction mixture, the labelling time,and the amount of antibodies andreductive agent,were studied experimentally and a better labelling method wasestablished,The labelling yidlds,as determined by paper chromatography,weregreater that 80%.关键词：Re;Antibody;Radiolabelling
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发布时间：2021-04-09 - 摘要：Through theoretical analysis and careful experiments, the origin of X- ray background in the mini- cyclotron was deduced and some methods to suppress it were described. As a result, the background counts have been reduced to 2/5 of the original value, which has greatly improved the detection efficiency, measurement precision and abundance sensitivity of the sensitive mini- cyclotron accelerator mass Spectrometer.关键词：X-rays;Minicyclotron;Background;Shielding
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发布时间：2021-04-09 - 摘要：Forty elements in NIST 1570a （or IAEA-331）, an intercomparison material, spinach, have been determined using the NAA techniques. Among them, 31 elements, i.e. Ag, Al, Ba, Br, Ca, Ce, Cl, Co, Cr, Cs, Eu, Fe, Hf,K, La, Mg, Mn, Na, Ni, Rb, Re, Sb, Sc, Se, Sr, Ta, Tb, Th, V, Zn and Zr, were determined by employing INAA. A series of simple and quantitative radiochemical separation procedures were established for the determination of 9 additional elements, Among them, Cd, Lu, Mo, Sm, Yb and U were determined by removing the major interfering nuclide 82Br; Cu by 0.048mol/L NaDDTC/CHCl3 extraction from 1mol/L HCl medium; and As and P by using an inorganic exchange column of acid aluminum oxide（AAO）. The interferences from fission products and γ spectrum of 235U have been corrected by the NAA software, ADVNAA.关键词：Neutron activation analysis;Radiochemical separation;Standard reference material;Spinach
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发布时间：2021-04-09 - 摘要：The extraction of Rb with 18-crown- 6（18C6） in nitrobenzene from picric acid is studied and the conditions on quantitative back-extraction of Rb are defined. The elution curve of Rb and Cs on zirconium phosphate column is given.关键词：Rubidium;Crown ether;Neutron activation analysis
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发布时间：2021-04-09 - 摘要：By using micro- scanning technique of SXRF （Synchrotron Radiation X-ray Fluorescence） combined with multivariable statistical analysis （correlation and hierarchi- cal cluster analysis）, the positional distributions of eleanens in the kidney tissues of three groups of Wistar rats i.e, the control, that treated by CdCl2 and that Cd exposed then treated with a new complex) were obtained. The results show that Cd is mainly distributed in the renal cortex of rats treated by CdCl2, while. the level of Cd in the renal medulla is very low or not detectable. The elements measured in renal cortex of the normal rats can be classified into two groups and Cu, Zn., Mn and Se belong to the same group and have very strong co-locations. In acute CdCl2 poisoning, there is a very strong correlation between Cd and Se, and a secondly strong correlation between Cd and Ca. The classification is therefore different from that for the control. After administration of a new chelator, a very strong co-location and correlation can be observed between Zn and Se, and the classification of elements tends to return to the normal distribution.关键词：Multivariable statistical analysis;Micro- SXRF;Positional distribution of elements;Renal damage;CdCl2-poisoning
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发布时间：2021-04-09 - 摘要：The charge-deposited densities of self-powered detectors with different structures, irradiated by γ- rays, are measured. Some experimental results arc given and discussed.关键词：γ-rays;Self-powered detectors;Charge deposition;Charge transfer;Insulators;Conductors
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发布时间：2021-04-09
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