最新刊期
      卷 0 ， 期 0 ， 2020
      • Guoliang Chen
        Vol. 10, Issue 5, (1987)
        摘要：Yamamura obtained an empirical formula of relative sputtering yields for monoatomic targets bombarded by low energy ions at oblique incidence as follows: y (θ) =Y (θ) /Y (0°) =tf • exp{- g (t- 1) }, t=secθ where f and g are fitting parameters depending on the measured curve of sputtering yields.We pointed out that g=f • cosθ0 where θ0 is the optimum incidence angle of ions at which sputtering yield Y (θ0) reaches the maximum. An analytical expression for θ0 was derived and its physical meaning was discussed in the paper.Finally, Yamamura formula could be written with the unique parameter f. The calculated results showed the equation given was accurate within a relative error of ±12%for targets Si and Ni bombarded by ions Ar and H in the low-energy range.  
        关键词：relative sputtering yield;optimum incidence angle of ion beam   
        8
        |
        15
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333464 false
        发布时间：2022-08-16
      • Zhufang Gong,Wengan Ma,Zhirong Lin,Zhaomin Wang,Zizong Xu,Yangmei Fan
        Vol. 10, Issue 5, (1987)
        摘要：The dependence of light output on the surface treatment of BGO crystals has been tested. The results of experiments and Monte Carlo calculation indicate that for tapered ВGO crystal one of the best ways to improve the uniformity and the energy resolution and to obtain higher light output is roughing the surface which connects PM tube. We also observed that different wrapping method can effect its uniformity and resolution. Our Monte Carlo calculation indicates that the higher one of the "double peaks" is the photoelectron peak of γ rays.  
        关键词：Light output;uniformity of light output;double peak;Monte Carlo calculation   
        10
        |
        13
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333497 false
        发布时间：2022-08-16
      • Shengkang Liu,Yu Mei
        Vol. 10, Issue 5, (1987)
        摘要：In this paper, a microcomputerized neutron moisture gauge is reported. This gauge consists of a neutron moisture sensor and instruments. It is developed from the neutron-moisture gauge for concrete mixer. Its character is that a TECH-81 single card microcomputer is used to play the role of count, compute and display. Its function has been increased ever the early type of the neutron moisture gauge. It has the function of computing compensated quantity of sand. It can acquire those measured data of several neutron sensors by the multichannel sampling, therefore it can measure moisture values of those sands in several hoppers simultaneously. The precision of the static state calibration curve is 0.24% wt. The error limits of the dynamic state check are <0.50%wt. It has satisfied the demands of the concrete production.  
        关键词：neutron moisture gauge;microcomputer;multichannel sampling;concrete production;compensated quantity of sand   
        8
        |
        12
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333465 false
        发布时间：2022-08-16
      • Jun Wang,Huade Cao,Qingbo Zhai,Meina Xue
        Vol. 10, Issue 5, (1987)
        摘要：A new equivalent base internal standard method was adopted to improve the traditional internal standard method, applied in different kinds of sample to correct the influence of different base material. The second part of this paper will describe an advanced curve smooth technique—smoothing spline function to make the determination of the relative sensitivity factor more reliable.  
        关键词：relative sensitivity factor;base material;smoothing spline function;equivalent base internal standard method   
        9
        |
        16
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333483 false
        发布时间：2022-08-16
      • Lin Tang,Ronghui Xu,Qidi Guo
        Vol. 10, Issue 5, (1987)
        摘要：The principle of the manufacture technology and the performance of the calorimeter are discribed in this paper. The ion beam current of the accelerator with high sensitivity and precision is measured by the calorimeter. The reliability of the measured results is discussed in detail.  
        关键词：calorimeter;Ohm heater;heat rating;electromotance;time lag   
        9
        |
        15
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333463 false
        发布时间：2022-08-16
      • Xikai Zhu
        Vol. 10, Issue 5, (1987)
        摘要：The effects of mechanical errors in quadrupoles on beam performances are discussed, using aberration theory of ion optics. The calculated results using parameters of the 2× 6 MV tandem accelerator at Shanghai Institute of Nuclear Research are also given.  
        关键词：quadrupole lens;aberration;mechanical error   
        9
        |
        15
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333499 false
        发布时间：2022-08-16
      • Qiliang Wang,Miaoting He
        Vol. 10, Issue 5, (1987)
        摘要：Using the combination of a RSS-111 high pressure ionization chamber and a FD-71 NaI (T1) scintillation radiometer, cosmic-ray ionization was measured on sea levels and lakes with different altitude and latitude. As a result of summing up the measurements made during the last three years, a empirical formula is obtained which might be used to estimate the cosmic-ray dose rate in air.The mean value of the measurements of the cosmic-ray ionization on the sea levels was 2.93±0.07×10-8 Gyh-1. The measurement data of the cosmic-ray ionization at the sea levels and lakes are given as well.The results have been compared with the similar works done by foreign authors.  
        关键词：cosmic-ray ionization;measurement;dose rate;empirical formula   
        9
        |
        13
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333509 false
        发布时间：2022-08-16
      • Jingcheng Wang,Zichang Shao
        Vol. 10, Issue 5, (1987)
        摘要：The S-lineshape parameter measurements of positron annihilation Doppler-broadening were performed for a Cu-23.48at%Zn-8.63 at%A1 shape memory alloy. The S-parameters progressively decrease with prolonged holding at room temperature. The result showed that the state containing martensitic and parent phase has an aging effect, of which micromechanism is an annihilation of vacancies.  
        关键词：Positron annihilation;shape memory alloy;copper-zine-al uminum   
        10
        |
        9
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333531 false
        发布时间：2022-08-16
      • Zhenlan Tao,Liping Zheng,Dexin Cao,Ahu Zhang
        Vol. 10, Issue 5, (1987)
        摘要：Using fast neutron activation analysis technique, the number of sputtered Au atoms that were deposited on the surface of carbon foil was determined. The result shows that obtained anisotropic factor A of sputtered Au atoms, i.e the ratio of sputtering yields between azimuth φ = 0 and φ=180 degree, was 1.70±0.4. The experiment result was compared with calculations of sputtering theory model.  
        关键词：Sputtering;fast neutron activation analysis;Anisotropy   
        8
        |
        15
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28326563 false
        发布时间：2022-08-16
      • Miao Chen,Zhiyi Zou,Shouxin Chen,Chunchang Sun
        Vol. 10, Issue 5, (1987)
        摘要：A short-gap ratarding system for getting~500 eV very low energy ion beams is described. Some design rules are discussed. Some experimental results are given also.  
        关键词：very low energy ions;Space charge effect;post-deceleration; lens system   
        9
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333583 false
        发布时间：2022-08-16
      • Xiaoguang Yao
        Vol. 10, Issue 5, (1987)
        摘要：A program of Monte Carlo calculation is established to calculate intrinsic efficiency of NaI, BGO, BaF2, CsF and plastic scintillator for gamma-ray with energy below 1.5 MeV. The scintillator shape can be rectangular, square or cylindrical. Their size and energy threshold can be selected arbitrarily. The part of calculation results is given.  
        关键词：intrinsic efficiency;Monte Carlo calculation program;NaI;BGO;BaF2;CsF;Plastic scintillator   
        12
        |
        16
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333560 false
        发布时间：2022-08-16
      • Yin Sha,Pingsheng Liu,Shisheng Xu,Daze Sun,Zhenjie Chen,Shaoxian Zhang,Liping Xu,Baoguo Wang
        Vol. 10, Issue 5, (1987)
        摘要：The sensitivity of the XRF apparatus was greatly improved by means of shortening the distances from the radioisotope source to the sample and from the sample to the Si (Li) detector. A high-purity aluminum tube was inserted in the stainless steel collimator, the obstruction peak of iron in background spectrum was reduced by a factor of 12.The concentrations of ten trace elements in 180 human hair samples from Pingdingshan. Henan province were measured by XRF. The concentrations of about ten trace elements in human hair from Pingdingshan were compared respectively with those from Tianjin and Shanghai by means of T-test, and the obvious differences in the concentrations of most corresponding elements were observed. The Fe, Cu, Ni and Se contents of human hair from Pingdingshan are on the low side of the reference values.  
        关键词：Human hair;Trace element;XRF;Collimator;T-test   
        9
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333621 false
        发布时间：2022-08-16
      • Hekai Rui,Meifen Wu,Huifen Gu,Qunying Tao,Guanghui Yu,Baoqin Jin
        Vol. 10, Issue 5, (1987)
        摘要：After sterilization with 1 Mrad γ-radiation, the samples are kept for two to four weeks. There is no obvious change in the appearance and the chemical constituents contents of the 15 kinds of Chinese herbal drugs include Ginseng.  
        关键词：radiation sterilization with 60Co;Chinese materia medica;active constituents   
        8
        |
        15
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333620 false
        发布时间：2022-08-16
      • Shengyan Feng,Guanying Qiu
        Vol. 10, Issue 5, (1987)
        摘要：This paper describes the feasibility of DNA-DNA hybridization on nitrocelluose membrane with home made 35S-α-dATP and its detection method.  
        关键词：35S-α-dATP;nick-translation;hybridization   
        9
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333619 false
        发布时间：2022-08-16
      • Meizhen Sun,Qiang Huang,Meichu Luo,Landi Li,Meizhen Zhang,Binyuan Shen,Maosong Jiang
        Vol. 10, Issue 5, (1987)
        摘要：This paper reports a new brain imaging agent-131I-IMP (131I-N-isopropyl-p-iodoamp-hetamine) synthesized from phenylacetic acid and labelled with 131I in the hydrothermal melting method. The optimum reaction was kept in 150℃ for 30 min and Cu (Ⅱ) was used as a catalyst. The labelling efficiency, radiochemistry purity and radioactive recovery of 131I-IMP were 96%, 98% and 90% respectively.The brain-blood ratio was 6.7 at 5 min and 13.2 at 60 min on rat fallowing IIMP intravenous administration.  
        关键词：brain imaging agent;IMP   
        9
        |
        13
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333635 false
        发布时间：2022-08-16
      • Jialing Gong,Ping Yan,Yanru Li
        Vol. 10, Issue 5, (1987)
        摘要：Radioiodine labelled amiodarone can be conveniently obtained in the presence of copper (Ⅱ) and excess reductant by hydrothermal method, at 100℃ for 1 hour and separated by TLC. Labelling efficiency is over 95%. Radiochemical purity is over 95%. The hydrothermal exchange method is a simple monocompartment isotope exchange reaction in homogeneous system and obeys the exponential law.  
        关键词：amiodarone;Radioiodine;exchange reaction   
        10
        |
        16
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333622 false
        发布时间：2022-08-16
      • Shijie Chen,Jiewei He,Suzhen Mo,Yamei Jiang
        Vol. 10, Issue 5, (1987)
        摘要：The α2-macroglobulin (α2M) was purified with gel filtration from the plasma of mice and labelled by the chloramine-T method. 125I-α2M has a half-life of 11.9 min, and it discharged rapidly from the circulation to urine after it was adiministered intravenously. The radioactivity can be found in many tissues of the mice after intravenous injection as well as intramuscular. At 3 hours after intramuscular administration the dose order in tissues (cpm/g) is as follows: lung>kidney>heart>spleen>jejunum>liver>testis> muscle.  
        关键词：125I-α2-macroglobulin;half-life;Metabolism   
        8
        |
        12
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 28333636 false
        发布时间：2022-08-16
      0