最新刊期
卷 0 ， 期 0 ， 2020
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Dose distributions of γ rays in silicon at and near interfaces between silicon and various materials
摘要：The dose gradient distributions of 60 Co γ rays in silicon at and near the interfaces between silicon and various materials were measured In the case of silicon adjacent to a high atomic number material, a dose enhancement effect was observed at the interface Dose gradient distributions were also calculated with a semiempirical electron transport equation based on the mechanisms of the Compton, photoelectric and Auger effects of γ-rays and secondary-electron transportation Good agreement was obtained between experimental and calculated results关键词：Co γ rays;Silicon;Interfaces;Dose distributions- 9
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发布时间：2021-04-09 - 摘要：Altogether 28 samples, mainly including glazes and bodies of ancient Chinese Ru porcelain, were analyzed by NAA technique and the contents of 36 elements were compared The scatter analysis for nine fingerprint-elements indicates that almost all ancient Chinese Ru porcelain samples had nearly identical and long-term stable source of raw materials although they were fired in different kilns, at varying time and with distinet colors, and moreover, the source of raw materials for modern Ru porcelain seems to approach that for ancient one The close provenance relation between ancient Jun porcelain and ancient Ru procelain is also preliminarily verified The glaze material of Jingdezhen white porcelain is totally different from all other samples, showing that the former came from a separate source关键词：Ancient Chinese Ru porcelain;NAA;Fingerprint element;Scatter analysis
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发布时间：2021-04-09 - 摘要：The present application of activable stable nuclide tracers to the study of soil erosion is discussed The rare earth element tracers are taken as an exapmle and the emphasis is placed on the application and prospect of the activable nuclide tracer method Experiment results have shown that the method has a great future in the studies on spatial and temporal distributions of soil erosion, sediment movement and deposition process as well as the sediment origin in small watershed关键词：Nuclear tracer;Soil erosion;Rare earth elements
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发布时间：2021-04-09 - 摘要：The paper describes the preparation of uranous nitrate in UO 2 （NO 3 ） 2 -HNO 3 - N 2 H 5 NO 3 system by membrane electrolytic reduction with titanium plate as cathode and platinized titanium net as anode The effects of current-density, concentrations of nitric acid, hydrazine and U（Ⅵ）, as well as temperature on the electrolytric reduction of U（Ⅵ） were studied and discussed Under optimum conditions, U（Ⅵ） can be reduced to uranous nitrate quantitatively and a U（Ⅳ） concentration higher than 150g/L can be obtained关键词：Membrane electrolytic reduction;Uranous nitrate;Hydrazine nitrate;Reduction rate
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发布时间：2021-04-09 - 摘要：Rubidium concentration of erythrocyte of healthy children aged from 6-11 years living in four areas of Sichuan Province with different selenium status was measured by PIXE and the results show that the Rb concentration in erythrocyte for the Keshan Disease area is two times more than other three areas Meanwhile the glutathione peroxidase （GSHPx） activity of erythrocyte was determined and the results confirm that children in the Keshan Disease area are really with selenium deficiency The Rb contents in rice and soil samples from the Keshan Disease area and the Se-deficiency area but with Se-supplementation to the inhabitants, were tested by INAA It was found that Rb contents in rice and soil from the former area were much higher than those from the latter This result indicates that Rb in erythrocyte of children is mainly taken from staple food （rice） and that a higher Rb level in soil is probably another environmental factor causing the Keshan Disease
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发布时间：2021-04-09 - 摘要：The cyclotron production of 97 Ru has been carried out by irradiation of natural molybdenum with α particles The preparation of 103 Ru labelled Etifenium and the effect of temperature and reaction time on the labelling rate were described, and biodistributions of the labelling compound in organs of mice were also determined关键词：Ruthenium;Etifenium;Labelled compound
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发布时间：2021-04-09 - 摘要：Various topologies of the pulse modulator output circuits used in small size electron Linac have been developed in order to suit different modulator loads Some common issues related to the topologies, including load disposition, DC and pulse equilibrium, connection of attached circuits, long cable and grounding, are raised and discussed in detail关键词：Electron LINAC;Electron gun;RF tube;Circuit topology;Bifilar winding pulse transformer
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发布时间：2021-04-09 - 摘要：As the ceramic window of the waveguide transmission system of a medical electron accelerator cracked and F 12 ; gas leaked into its vacuum system, some verdigris was found to contaminate the internal surface of the accelerating tube The X ray diffraction analysis indicates that the verdigris consists of CuCl·3[Cu（OH） 2 ] predominately and CuCl The causes of forming verdigris are discussed It seems that any kinds of isolation gas leaked into the vacuum system can be ionized and then corrode the copper surface Various possible reasons for causing cracks on the ceramic window are cited and some preventive measures are suggested关键词：Medical accelerating tube;Ionization;Corrosion
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发布时间：2021-04-09 - 摘要：The ion exchange behavior of Au and Pt on a new China-made macropore anion resin was studied by using radiotracer technique The conditions for adsorption and desorption, such as acidity, flow-rate and concentration of desorpting agents were investigated carefully Using the method established, the contents of Au and Pt in some Chinese geological SRMs were determined by ICP-MS and the results agreed well with the reference values关键词：Radiotracer technique;Gold;Platinum;HHY-10A macropore resin;Z1Ion exchange;Preconcentration
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发布时间：2021-04-09 - 摘要：Besides energy deposition（ED）,mass deposition（MD） and charge exchange（CE）were also considered as important facors in the survival of organism undet low energy ion beam irradiation If was proposed that the MD and the CE have indirect effect of protecting DNA from damage,and then an equation of the EMC model describing the survival of organiam irradiated by low energy ion besm was deduced and some typical curves were given,With this equation,some expetimemtal data about survival were well fitted In addition,the presumption that the MD product could damage DNA was questioned by the EMC model,thus further supporting the theortical basis of the EMC model关键词：Ion besm;Irradiation;Survival model
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发布时间：2021-04-09 - 摘要：The improvement of Mssbauer spectrometric buffer is reported By using software instead of hardware and with new design, the measuring system without a single channel analyzer is more reliable and efficient关键词：Mssbauer spectrometer;Single channel analyzer;Discriminator threshold;Dead time
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发布时间：2021-04-09 - 摘要：The performance degradation and dose enhancement effects of CMOS circuits in an X-ray radiation environment are presented The relative dose enhancement factors （RDEF） are measured and the RDEF of CMOS manufactured in different technological conditions are compared The mechanism of X-ray dose enhancement for the material with higher atomic number is discussed关键词：CMOS circuit;X-ray;Dose enhancement;Radiation effect
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发布时间：2021-04-09 - 摘要：JZ)〗 The radiation crosslinking of PE, EVA, EPDM, EEA and their blends has been studied A non-halogen flame retardant polyolefin complex has been prepared with aluminum tri-hydrate （ATH） and red phosphor as flame retardant The experimental results show that radiation crosslinking can not only improve mechanical properties of the material but also increase its oxygen index （O I） thus the melt drop phenomenon disappears The new flame retardant polyolefin thus prepared, with a limiting oxygen index of 31, a tensile strength of 9 9MPa and an “elongation at break” of 200%, can therefore be applied to the electric wire and cable industry关键词：Radiation crosslinking;Polyolefin complex;Non-halogen flame retardant
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发布时间：2021-04-09 - 摘要：The fast neutron flux spectrum has been measured by the activation of the threshold detection foils at the inner and outer irradiation sites of the Miniature Neutron Source Reactor in China Institute of Atomic Energy Five threshold detection foils, i e Al, Fe, In, Ni and Mn were adopted in the experiment The ratios of fast-to-thermal neutron flux for inner and outer irradiation sites were calculated by the method of average cross section, to be 0 198±0 005 and 0 071±0 003, respectively The method of effective threshold energy was used to calculate the neutron flux in different energy ranges The axial and radial inhomogeneities of fast neutron flux for four irradiation sites and the inhomogeneity for different inner irradiation sites were also measured关键词：Miniature neutron source reactor;Fast neutron flux;Neutron activation threshold reaction detector
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发布时间：2021-04-09
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