最新刊期
卷 0 ， 期 0 ， 2020
- 摘要：? Calibration of the pMOS dosimeter at VT mode has been carried out for the irradiation of 60Co gamma rays or 6MeV electrons It is shown that, at the dose range larger than 102Gy（Si）, the response curve of threshold voltage shift to irradiation dose is linear and the sensitivity of the pMOS FET to irradiation is 20mV/Gy（Si） which is suitable for the use in the space radiation environment The sensitivity to 60Co gamma rays is about 13 times of that to 6MeV electrons Considering the dependence of sensitivity of the pMOS dosimeter on the sort of irradiation particles, a calibration method for a mix-irradiation field is suggested关键词：pMOS dosimeter;Irradiation;Mix-irradiation field;Calibration
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发布时间：2021-04-09 - 摘要：? The thermoluminescence （TL） from anhydrous magnesium sulphate irradiated with γ-rays was measured in pure nitrogen environment from room temperature up to 500℃ The TL glow curves were deconvoluted into four elementary peaks based on the Gaussian function The trapping parameters including activation energy, frequency factor and kinetics order were determined for each peak by two heating rates and variable heating rate methods The results show that the total glow curve can be well fitted with general order kinetics关键词：Thermoluminescence;Glow curve deconvolution;Trapping parameters
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发布时间：2021-04-09 - 摘要：? By means of a new spectrum-stripping method, depth profiling of hydrogen and deuterium absorbed in titanium film has been performed using two recoil spectra obtained at different incident 4He++ energies （42MeV and 45MeV） with and without considering the energy spread effect Satisfactory depth profiles of hydrogen and deuterium have been achieved when the energy spread effect is considered关键词：Elastic recoil detection analysis;Depth profiling;Depth resolution
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发布时间：2021-04-09 - 摘要：? The β-ray resistive ability of transistors and the recovery ability of the pre-irradiation damaged transistors after annealing for different time with various energies and densities of electron beam have been studied Some theoretical and experimental bases have been laid for the screening of radiation-resistive transistors by the “pre-irradiation damage-annealing” techniques关键词：Transistor;Electron beam;Irradiation damage;Annealing
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发布时间：2021-04-09 - 摘要：This paper reviews the recent progress of the nuclear microprobe techniques in both micro-analysis and micro-imaging Their applications to various scientific fields are also reviewed based on the statistic figures collected from the previous five international conferences关键词：Nuclear microprobe;Microscopic analysis technique;Microscopicimaging technique
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发布时间：2021-04-09 - 摘要：? It is found that the crystalline diffraction angles of the electron-beam irradiated filter paper cellulose shift regularly when the irradiation dose is increased Our experiments indicate that the molecules between crystalline area and amorphous area in the filter paper cellulose will be degraded by the irradiation and the cellulose molecules in the surface of crystal will come off, thus the microcrystalline dimension will be reduced and the diffraction angle will become smaller The fact that intensity of the 002 peak for filter paper samples decreases gradually with the increasing storage time can be attributed to the post-irradiation effect关键词：Cellulose;Irradiation;Filter paper;Diffraction peak
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发布时间：2021-04-09 - 摘要：The extraction mechanisms of U（Ⅵ） and Th（Ⅳ） in nitric acid solutions with N,N,N′,N′--tetrahexylsuccinylamide（THSA） were described The effects of nitric acid concentration, THSA concentration and temperature on the distribution coefficients of U（Ⅵ） and Th（Ⅳ）, and the back extraction behaviours of U（Ⅵ） and Th（Ⅳ） from organic phase were studied The compositions of the complex are found to be UO2（NO3）·THSA and Th（NO3）4·2THSA The equilibrium constants and thermody- namical functions of the extraction reactions have been calculated
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发布时间：2021-04-09 - 摘要：? A two-dimensional imaging system of β-rays is presented in this paper The scintillating fiber has a diameter of 1mm and an aperture angle of 337° Clear images of various patterns of collimators were obtained with a β-ray source, with a spatial resolution of 1mm关键词：Plastic scintillating fiber;Two-dimensional imaging system;β-rays
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发布时间：2021-04-09 - 摘要：? Briefly described is a mathematical formula of the interrelated optimized matrix correction coefficients, deduced from the independent matrix correction coefficients of every interested element in a sample Use of the optimized matrix correction coefficients can improve the analysis accuracy for every element in the sample For an interested element with a concentration less than or equal to 03% the relative error of the analysis can be reduced from 23% to 15%关键词：Energy-dispersive X-ray spectrum analysis;Matrix correctioncoefficients;Optimization
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发布时间：2021-04-09 - 摘要：? Since the establishment of Peking University Accelerator Mass Spectrometry （PKUAMS）, a series of successful application research have been made in various fields More than 20 human bone fossil samples in unknown layers from different areas of China have been measured by the PKUAMS facility The facility and 14C measurements are described in detail in this paper
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发布时间：2021-04-09 - 摘要：Using Hologic QDR-2000 Dual Energy X-ray Absorptiometry（DEXA）, the BMD determination was performed in 210 selected Shanghai residents of both sexes across the age range of 16—50 In female groups the peak value of the L1-L4 BMD is 1023g/cm2 at the age of 31—35, while in male groups the peak BMD value is 0971g/cm2 and it occurred at the age of 26—30, the peak period lasts till the group aged 46—50 The similar conclusion is also drawn by further statistical treatments of data关键词：Bone mineral density;Dual Energy X-ray Absorptiometry
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发布时间：2021-04-09 - 摘要：? The 140keV H+ with a dose of 5×1016/cm2 was implanted into Si wafer at room temperature, leading to the formation of a bubble layer beneath the surface, and the annealing behavior of the bubbles was investigated by the Rutherford backscattering and channeling spectrometry, thermal wave analysis technology and microscopy It was found that, above a critical annealing temperature, blistering and flaking will occur at the surface of the implanted sample, and the density of flaking increases with the increasing of annealing temperature Below this temperature, the crystalline character of the top Si layer is not influenced by the bubbles The thermal wave analysis results indicate that the bottom of flaking area is irregular The blistering and flaking phenomena of the implanted samples were also discussed关键词：H+ implantation;Bubble layer;Flaking
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发布时间：2021-04-09 - 摘要：? A system of data acquisition was introduced for the dose monitoring of the HIRFL environment There are 36 data acquisition channels in this system, corresponding to the 18 dose monitoring points The system has the functions of automatic data acquisition and on-line analysis in the whole monitoring process The basic working principle of the system, data acquisition, data storage, sound-light alarm, safety- interlock and some monitoring results were introduced in detail关键词：HIRFL;Dose monitoring;Data acquisition;Safety-interlock
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发布时间：2021-04-09 - 摘要：? The effect of electron-beam irradiation on the C60-benzene homologue solutions was investigated The structure of C60 is found unchanged when it is exposed to the electron beam at room temperature under normal atmospheric pressure However, a lot of brown deposition will be produced when the C60 dissolved in benzene homologue is irradiated with electron beam The infrared spectra of these brown deposits show typical IR absorption peaks of C60, benzene, toluene and xylene Supernatants of the irradiated C60-benzene homologue solution are measured by an UV spectrometer, showing that there is no C60 species in the supernatants of both C60-benzene and C60-toluene solution, while in the xylene solvent some quantity of C60 can still be observed关键词：C60;Benzene homologue;IR spectroscopy;UV spectroscopy
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