最新刊期
卷 0 ， 期 0 ， 2020
- 关键词：Heavy ion;adhesion;Interface;Sputtering
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发布时间：2022-09-13 - 摘要：Silicon crystal lattice damage induced by low energy ions is measured by RBS and channeling. The dependence of the lattice damage on crystal orientation, ion energy and dose is investigated. The kinetics of damage formation is discussed.关键词：Sputtering;Damage;etching
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发布时间：2022-09-13 - 摘要：A compact sputtering PIG ion source with end extraction was described, which can produce both gas and metal ions from cathode materials. The magnetic field is provided by a SmCo permanent magnet. Using Ar and BF3 as the discharge gas when discharge power was about 30 W, 500—680 µA for Ar+, 150 µA for Ar2+ and 100—130 µA for B11+ beam intensities were produced. With argon auxiliary gas, we have got 70 µA for Zr+, Fe+, Al+ etc., 50—60 µA for Ta+ and about 30 µA Ti+, Mo+ metal ions beam intensities. The beam intensity of double charge metal ions were usually 1/2—1/5 of that of single charge metal ions.关键词：SmCo permanent magnet;sputtering PIG ion source
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发布时间：2022-09-13 - 摘要：An intelligent instrument for coating thickness measurement has been developed by using X-ray fluorescent and modern microcomputer techniques. This paper discribes the principle and the construction of the instrument. The instrument allows fast, precise and nondestrustive measurement of the thickness of various coating plating on metallic or nonmetallic parts. For example, the range of the thickness measurement for magnetic coating layer of the magnetic disc is M=50—500µg/cm2, the precision of coating thickness measurement is better than ±4% (M=100µg/cm2).关键词：coating thickness;intelligent instrument;X-ray fluorescence interface;program
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发布时间：2022-09-13 - 摘要：Three aspects of experimental studies are described. The first is the selection of the optimum experimental condition. The second is the processing of complex overlapped spectra by AXIL program package. The third is the determination of the relative sensitivity factors, which is the most important problem of XRF method with internal standard.关键词：X-ray fluorescence analysis;relative sensitivity factor;internal standard;AXIL programme package;characteristic peak;overlapped spectra resolution;goodness of fitting
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发布时间：2022-09-13 - 摘要：The paper describes the technique used in measuring absorbed dose components of neutron and photon in the (n, γ) mixed neutron field. The gamma-ray calibration was carried out by a collimated beam of 60Co gamma-ray. The KT value of a TE-TE ionization chamber was calculated. The KU values of C-CO2, Al-Ar chamber and GM counter were measured by a modified lead attenuation method. The correction factors were determined in the neutron field produced by T (d, n) 4He reaction. Finally, the neutron Kerma and photon Kerma in tissue free-in-air was measured and their overall uncertainties were estimated.关键词：Ionization chamber;gamma-ray calibration;relative sensitivity;Absorbed dose;kerma
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发布时间：2022-09-13 - 摘要：A miniature semiconductor detector was developed by ion implantation technique, and its temperature effect, space resolution, noise and count ratio were tested. The results show that the detector can be used for medical purposes.关键词：Ion implantation;Semiconductor detector;Cancer
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发布时间：2022-09-13 - 摘要：The assembly of the thermal neutron transmission gage is described. The method to study the hydrogen content in γ-Fe2O3 structure using thermal neutron transmission gage is discussed. The experimental result is qualitatively consistent with the measuring result of specific saturation magnetization. It indicates that there are hydrogen atoms in the γ-Fe2O3 structure.关键词：thermal neutron transmission gage;γ-Fe2O3;Hydrogen;specific saturation magnetization
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发布时间：2022-09-13 - 摘要：This paper reports the apparatus and technique of measuring regional cerebral blood flow (rCBF) with 133Xe inhalation and dual-NaI (Tl) detectors. The conditiors of measurement were selected. The rCBF values of 106 normal volunteers were given. This apparatus was shown to be of simple composition and easy to operate.关键词：regional cerebral blood flow;133Xe inhalation technique;measuring apparatus
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发布时间：2022-09-13 - 摘要：The principle and the construction of NSD-A seepage-direction detector and its applications in the sites of several unsafe reservoirs are described. The detector is simple and easy to operate. In a 5 mm diameter hole it can be used to determine the eepage-direction of groundwater with seepage velocity more than 0.1 m/day in various Sgeological strata and bed rocks.关键词：seepage-direction detector;groundwater flow direction;adsorption trace;Tracer;I-131
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发布时间：2022-09-13 - 摘要：This paper describes in detail the preparation of 141Ce standard solution with enriched 140Ce target (99.4%) and the absolute measurement of 141Ce disintegration rate by 4πβ-γ coincident method. The overall uncertainty of the standard solution is ±1%.关键词：enriched target;disintegration rate;absolute measurement
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发布时间：2022-09-13 - 摘要：It is difficult to use 3H and 125I in dual isotope LS counting, because their pulse height spectra are overlapped.According to Klein-Elsler method, the degree of separation between two isotope spectra can be enhanced by selecting the discriminator setting for each channel. The concentrations of 3H and 125I can be calculated from the total activity appearing in each channel and from the ratio of counts in the two channels for each isotope when they are present in pure form. This method can easily be used in 3H and 125I double labelling study.关键词：Liquid scintillation counting;3H and 125I double labels measurement;Klein-Elsler method
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发布时间：2022-09-13 - 摘要：This paper describes a method of determination of recent sediment sedimentation rate by Po-210 spontaneous deposit counting. It is shown that the experimental results are in agreement with α-spectra analytical method.关键词：Po-210 spontaneous deposit counting;recent sediment;sedimentation rate
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发布时间：2022-09-13 - 摘要：The I-, IO3- and IO4- ions were seperated by ascending paper chromatograpnic method. The performances of five mixture with different ratio of DMF and 0.1 mol/1 NaOH were comparedas developing agents. The results showed that I-,IO3- and IO4- could be separated most effectively by using 1:1 mixture of DMF and 0.1 mol/1. It is recommended as a method for the determination of radiochemical purity of radioactive NaI(I-123, I-125, I-131)by its good reproducibility and efficiency.关键词：sodium iodide (I-123) injection;Radiochemical purity;Paper chromatography
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发布时间：2022-09-13 - 摘要：In this work, C-13-methacetin contents in serum were measured in several normal adults and hepatic patients by isotope reverse dilution analysis using GC-MS technique.The result showed that the serum C-13-methacetin content of hepatic cirrhosis patients (1.050±SEM 0.227 µg/ml) was singnificantly higher than normal (0.209 ± SEM 0.038µg/ml). Therefore it is clear that the delay of 13CO2 elimination in hepatic patients is mainly caused by the malfunction of liver in oxidizing mathacetin, and the influence of absorption rate is negligible.关键词：isotope reverse dilution analysis;C-13-methacetin;GC-MS;Hepatic cirrhosis
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发布时间：2022-09-13
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