最新刊期
      卷 0 ， 期 0 ， 2020
      • Caigu Zhang,Zhuxing Yu,Zhu Wang,Zhe Huang,Jun Zhou
        Vol. 10, Issue 12, (1987)
        摘要：The study on a new superconductor oxide Ba-Y-Cu with high critical temperature Tc is described. The experimental results show that positron lifetime reducing reflects variable curve of resistance with temperature. A peak of positron lifetime is appeared at critical temperature.  
        关键词：Positron annihilation;Positron lifetime spectra;superconductor;Ba-Y-Cu oxide;Doppler broadening   
        9
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839337 false
        发布时间：2022-09-13
      • Shengyun Zhu,Mingli Dong,Tao Zuo,Weiqi Shen
        Vol. 10, Issue 12, (1987)
        摘要：A four-detector time differential perturbed angular correlation spectrometer is built based on the original rotating three-detector spectrometer in order to improve the accuracy and reliability of the measurement and to increase the coincidence efficiency. The spectrometer possesses the advantages of high coincidence efficiency, good differential non-linearity and independance of the measurement upon detector efficiencies. It has a time resolution better than 1.5 ns, a differential non-linearity of less than ± 2.5% and a good stability for a long time operation. The spectrometer has been used in the study of quadrupole interaction and the study of structure and phase transition in materials. Satisfactory results have been obtained.  
        关键词：four-detector TDPAC spectrometer;spin rotation function R (t)   
        9
        |
        13
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839336 false
        发布时间：2022-09-13
      • Guozhu Chen,Chengde Ma,Yumin Zhang,Wei Zhang
        Vol. 10, Issue 12, (1987)
        摘要：The paper described the advance of a low-noise pulsed-light feedback charge sensitive preamplifier used in a low energy X-ray Si (Li) spectrometer. The electronics noise FWHM (to Si) is 85—110 (0 capacitance). Experimental results are presented.  
        关键词：pulsed-light feedback;Noise;Energy resolution   
        9
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839329 false
        发布时间：2022-09-13
      • Bingqiao Lou
        Vol. 10, Issue 12, (1987)
        摘要：This paper describes the construction and specifications of a fast random pulse generator. It consists of a fast LED light source, a PMT, a fast discriminator, a fast amplifier, a fast counter and a negative feedback stable circuit. The counting rate of time non-variant random pulses is near 103 cps. Time variant random pulses can vary with the shape of time variant pulse.  
        关键词：random pulse;randomness;Poisson distribution;time variant function   
        8
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839326 false
        发布时间：2022-09-13
      • Xiuyu Wang,Erkang Zeng,Yusong Wan,Xiaosong Liu
        Vol. 10, Issue 12, (1987)
        摘要：The ediment accumulation rates were estimated from the vertical distribution of excess 210Pb measured in sediment cores collected from Lake Poyang, Jiangxi. These rates were various with the difference in hydrology. The sedimentation rates are the lowest in the middle region of the lake, in which two samples could not be determined and the other one is 0.14 cm/a. The sedimentation rates are lower in the northeast basin section, averaging 0.19 cm/a. In the diffusion area of the lake from which 5 rivers enter sand deposion is more than in other areas of the lake and the hydrology factors are various, the sedimentation rate variation is lager. They are from 0.08 cm/a to 0.28 cm/a. Because of the and from the Yangzhi River the sedimentation rates are the highest in the water-way section of the lake, averaging from 0.23 cm/a to 0.62 cm/a.  
        关键词：lead-210;determination;lake;sediment   
        8
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839328 false
        发布时间：2022-09-13
      • Yuanxun Zhang,Xuepeng Wang,Min Zhi,Jianhua Yin,Yine Qian,Yuandi Cheng
        Vol. 10, Issue 12, (1987)
        摘要：This paper deals with the determination of trace elements in normal human hair, liver and kidney by the method of proton induced X-ray emission (PIXE) analysis. Sampling, specimen preparation and experimental procedures are described in detail. The accuracy of our system has been checked up with the determination of standard reference materials. The preliminary results on correlations between trace elements in human tissues are discussed. Application of the method described in the paper gives evidence in favour of the PIXE as a good tool for investigation of biological medicine.  
        关键词：X-ray fluorescence;Trace elements;Nuclear analysis   
        14
        |
        15
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839394 false
        发布时间：2022-09-13
      • Yuzheng Wang,Guodong Wu,Jinxin Lin,Chunliang Qian,Lianxue Gu,Jinxing Huang
        Vol. 10, Issue 12, (1987)
        摘要：This paper describes a new radiochromatographic analysis device. Its detector is a flow gas position sensitive proportional counter, which replaces the traditional mechanical scanning device. It can be used to analyse 3H, 14C labelled compounds on paper; silicon gel-thin layer and gel electrophoresis layer. Its position resolution is 3 mm with the peak to valley ratio being 2.6. The time of measuring a specimen is about one minute.  
        关键词：radiochromatography;position sensitive proportional counter   
        9
        |
        15
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839405 false
        发布时间：2022-09-13
      • Tao Jin,Guangwen Zhou,Zixiong Zhou,Xingfa Zhang,Lifu A
        Vol. 10, Issue 12, (1987)
        摘要：Measurement of dose rate distributions of 1.5 MeV electron beams in silicon with extrapolation chamber are discribed. It is considered tha the influence of scattering electrong on the absorbed dose rate distributions of silicon surface-shallow layers can't be ignored.  
        关键词：absorbed dose distributions from electron beams;extrapolation chamber;Silicon   
        12
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839396 false
        发布时间：2022-09-13
      • Yongyi Zhu,Tongcai Qiu
        Vol. 10, Issue 12, (1987)
        摘要：Absorbing fission products from soil is one source of crop contamination from radioactivities. The activity of fission products in soil changes with types of soil. This experiment studied the effect of agrochemical properties of soil on absorption of 90Sr by spring wheat using six types of soil. The result showed that amount of exchangable calcium and pH value are significantly negative correlated with amount of 90Sr uptaken by wheat plant. The differences between six types of soil are 1—6 times in amount of 90Sr absorbed and concentration coefficient in wheat plant. The concentration coefficient in wheat seed varied in the range of 0.08 to 0.59.  
        关键词：Isotope tracer;crop absorption;Fission product;soil property   
        9
        |
        17
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839393 false
        发布时间：2022-09-13
      • Jingcheng Wang,Sikang Ni,Xiaoying Meng
        Vol. 10, Issue 12, (1987)
        摘要：Liquid-rolling method is a new technology of production based on the liquid -quenching for preparing glassy metals. The alloys obtained with this technology will be widely applied in industry before long, because they have no problem of thermal stability which oxists in amorphous. The present paper first reported the experimental results by Doppler-broadening of positron annihilation in a Fe-3 %Si alloy liquid-rolled, which showed that positron annihilation will be useful for studying this kind of alloys.  
        关键词：Positron annihilation;liquid-rolling technique;silicon steel   
        9
        |
        11
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839395 false
        发布时间：2022-09-13
      • Chuanyuan Yin
        Vol. 10, Issue 12, (1987)
        摘要：A device for taking M?ssbauer data based on a single-board computer is described. The device is simple in construction and to operate. The spectrum is displayed by an oscillograph. So it is very convenient for teaching and research work.  
        关键词：single-board computer;M?ssbauer spectrum;digital-to-analog converter   
        8
        |
        13
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839440 false
        发布时间：2022-09-13
      • Feng Yang,Jiarui Liu
        Vol. 10, Issue 12, (1987)
        摘要：A stainless-steel target chamber for ion implantation and ion beam analysis in-situ, like RBS, channelling and charged particle reactions, is described. A 3-axis precise goniometer with 2-dimension parallel movements and two Au-Si surface barrier detectors with different solid angles have been istalled in the chamber. The target chamber has a good base pressure, no evidence of oil contamination, quick sample replacement and high efficiency for various ion beam analysis. Those have been demonstrated by the experiences of four years using.  
        关键词：Ion implantation;ion beam analysis;Target chamber   
        9
        |
        16
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839454 false
        发布时间：2022-09-13
      • Shangen Jiang,Liufang Zhang,Dongzhu Zheng,Zheng Feng,Zufan Wu
        Vol. 10, Issue 12, (1987)
        摘要：Pyronaridine is a high efficient and low toxic new antimalarial drug. 3H-pyronaridine was prepared by catalytic isotopic exchange in solution with tritium gas using Pd0/BaSO4 as catalyst. That crude product was purified by extraction. 3H-NMR spectra of pyronaridine showed that tritium was labelled at the 6-position. Specific activity of 3H-pyronaridine was 5.5 Ci/mmol and radiochemical purity over 95%.  
        关键词：tritium tracer;pyronaridine;gas-liquid exchange   
        9
        |
        13
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839487 false
        发布时间：2022-09-13
      • Zhengsheng Yao,Zhiping Cao,Liping Yang
        Vol. 10, Issue 12, (1987)
        摘要：In this paper, we present a method to determine the relationship of liquid-scintillation counting efficiency between 3H and any of the 34 pure beta-particle emitters based on the figure of merit. The calculated quench curve for any interested radionuclide can be obtained from the experimental quench curve for 3H and the corresponding efficiency relationship table.  
        关键词：pure beta-particle emitters;liquid-scintillation counting efficiency;figure of merit   
        9
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839477 false
        发布时间：2022-09-13
      • Chengfang Fan,Pinfang Li,Maoliang Wu,Quan Zhao
        Vol. 10, Issue 12, (1987)
        摘要：This paper describes the use of TLD method to measure exposure dose rate in 60Co garden. As compared with chemical dosimetry, the relative deviation of measurement would not exceed 10%. The good repeatability has been proved by comparing the measurements of different times and distances with correction of decay law and 1/12 law, Besides, the distribution of exposure dose rate was influenced by scattering of the living plants.  
        关键词：60Co garden;exposure rate;living plant;thermoluminescent   
        8
        |
        13
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839490 false
        发布时间：2022-09-13
      • Yongqing Yang,Yimin Jiang,Wendong Lu,Rongen Zhu,Jun Zhang,Runzhi Guo,Zengpu Sun,Chongyuan Wang
        Vol. 10, Issue 12, (1987)
        摘要：Three standard strains of mycobacterium tuberculosis (H37RV-fully sensitive, SM-R1000 μg/ml, RFP-R 100 μg/ml) were tested with 10 concentration of 5 antitubercular agent, INH, SM, PAS, RFP and EB. 114 isolates of mycobacterium tuberculosis taken from patients were tested with INH, PAS, SM and RFP, they were agreed with the results of standard Lowenstein-Jensen method is 81.7%. 82% of the isolate test were completed within 5 days. Our method may be used in routine clinical work. The liquid media that we prepared do not require human serum albumin and it is less expensive and readily available.  
        关键词：mycobacterium tuberculosis sensitivity test;liquid media   
        9
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839492 false
        发布时间：2022-09-13
      • Aina Yuan,Huiyang Zhao
        Vol. 10, Issue 12, (1987)
        摘要：The OMEGA 500 single photon emission computerized tomography (SPECT) system made in USA, has been improved in energy resolution, integration linearity and uniformity from 13.2%, 0.88mm and 5.2% to 10.9%, 0.82mm and 4.2%, respectively) by using a microprocessor SENTINEL instead of conventional electronic circuits. SENTINEL is composed of MC 68000 microprocessor chips and a software package, allowing to perform the corrections of the SPECT system under different energies, radioactive sources and a variety of collimation. The correction data are stored on a floppy disc and can ready to be accessed.  
        关键词：Microprocessor;SENTINEL;OMEGA 500;single photon emission computerized tomography (SPECT)   
        9
        |
        14
        |
        0
        <HTML>
        <L-PDF><Meta-XML>
        <引用本文> <批量引用> 29839491 false
        发布时间：2022-09-13
      0