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      卷 0 ， 期 0 ， 2020
      • Huazhong Yang,Zhengmin Liu,Kunshan Yang,Yuanxun Qiu
        Vol. 13, Issue 8, (1990)
        摘要：Cl ionbeam induced changes of adhesion of thin Au and Ag films on muscovite mica substrates have been studied for beam energies ranging from 1.02 to 4.02 MeV and for a wide range of doses. Threshold doses (Dth) of enhanced adhesion for different energies have been measured by the Scotch Tape Test. It is found that after ion bombardment with a dose less than Dth the adhesion of thin metal im on mica substrate becomes weaker. The lower the Cl ion irradiation dose the more obvious this phenomenon. An acid (aquaregia) corrosion test indicates that the corrosion resisting time of irradiated metal films is prolonged with inorease of the Cl ion doses.  
        关键词：Cl ion;Irradiation;Metal film;Muscovite mica;Threshold dose   
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        发布时间：2022-08-16
      • Xiaoqing Hu,Yuanxiang Xie,Hushan Xu
        Vol. 13, Issue 8, (1990)
        摘要：Time compensation method is used in a compact heavy ion timing detector with a microchannel plate. The time resolution of 200 ps has been achieved using a silicon detector as a stop detector.  
        关键词：Time of flight;Microchannel plate;Time compensation method   
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        发布时间：2022-08-16
      • Haoyuan Shen,Helian Lin
        Vol. 13, Issue 8, (1990)
        摘要：Si(Li) X-ray detectors are available today in the field of nuclear techniques. At present we have made a series of Si(Li) X-ray detectors with high resolution. The processing technology and performance of the detectors are described. The largest active area of the devices is 200 mm2 with the best resolution (FWHM) of 216 eV and an average resolution of 223 eV for 5.9 keV. The best resolution for 28mm2 Si(Li) detector is 139.6eV.  
        关键词：Si(Li) X-ray detector;High resolution   
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        发布时间：2022-08-16
      • Min Tan,Changmao Chen,Zheng Wang,Youqin Wen
        Vol. 13, Issue 8, (1990)
        摘要：Leake counters are commonly used in neutron dose-equivalent rate measnrement. In this paper, the directionality and collimated beam response of Leake counters are described. The experimental results show that there is no directional dependence for Leake counters, and that Leake counters with different absorbers have similar collimated beam respouse, which can be expressed by the formula .  
        关键词：Leake counter;Directionality;Collimated beam response   
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        发布时间：2022-08-16
      • Keqin Li
        Vol. 13, Issue 8, (1990)
        摘要：The mechanism of radon anomaly caused by water in rock and fossil river course is studied. Characters of radon anomaly in five water-bearing structures are pointed out. Initial success has been won making use of these characters to guide ground water exploration.  
        关键词：Ground water;Sedimentary surface of uranium and radium;Radon anomaly;Water-bearing structure   
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        发布时间：2022-08-16
      • Guanghua Zhu,Xinfu Wang,Xinyin Shen
        Vol. 13, Issue 8, (1990)
        摘要：PIXE technique combined with using cascade impactor, was applied to determine the elemental concentration and size distribution. The variation of elemental concentrations with time was also measured. The correlativity between elemental concentrations was calculated to infer pollution sources. The superiority of PIXE technique in atmospheric monitoring Was discussed.  
        关键词：PIXE analysis;Atmospheric aerosol;Single orifice cascade impactor;Streaker   
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        发布时间：2022-08-16
      • Xingliu Jiang,Tianmin Wang,Jincheng Gao,Lijun Han,Bingqing Li
        Vol. 13, Issue 8, (1990)
        摘要：A new approach of preparation for thin multilayer films is described. A powerful pulsed e-beam is used to irradiate a metal target, leading to the formation of transient hot plasma. The energetic metal ions ejected from such plasma are deposited on the surface of the near-by substrate. The multilayer films of Co/Ti system and other metals have been prepared. The TEM and AES investigations for such films are reported.  
        关键词：Multilayer film;Plasma;Vapor deposition;Pulsed electron beam   
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        发布时间：2022-08-16
      • Yingmei Gu,Jieqing Zhu,Anquan Le
        Vol. 13, Issue 8, (1990)
        摘要：A tube-excited X-ray generator for XRF analysis is described. The major features of this generator are compact construction, high stability in both X-ray intensity and its energy spectrum, and X-ray emission with small area. At present, it has been used in a newly designed XYH-86 small-area coating-thickness gauge successfully.  
        关键词：X-ray tube;High voltage power supply;Stabilizer for filament current   
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        发布时间：2022-08-16
      • Shuwei Xu,Manqing Liu
        Vol. 13, Issue 8, (1990)
        摘要：A ΔE-E plastic scintillator β telescope had been built, and calibrated by using a group of β- and β+ emitters and a 207Bi source. Their end-point energies were determined via two different methods, i. e. weighted linear least-square fit to the Fermi-Kurie plotes of the data after correcting for the finite energy resolution of the E scintillator and direct linear least-square fit to the square root of the raw data. It is shown that the latter can estimate the end-point energy rapidly, while the former can be used to determine the end-point energy with uncertainty about 35 keV for energy ranging 0.7 to 6.1 Me.  
        关键词：Plastic scintillator;β measurement;Fermi-Kurie plot;Response function;Energy calibration   
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        发布时间：2022-08-16
      • Qi Huang
        Vol. 13, Issue 8, (1990)
        摘要：The chlorine-36 production, principle and experimental method of 36Cl dating are briefly described. Measurements have been made of the ratios of chlorine-36 to chlorine in halite samples from Searles Lake and Gasikule Lake sediments. The ages calculated from the 36Cl/Cl ratios are generally concordant with those obtained by using 14C, 230Th and magnetostratigraphic techniques, which confirms the constancy of the chlorine input ratio over the last million years and implys that 36Cl can provide accurate dates on continental saline sediments.  
        关键词：Chlorine-36;Chlorinc-36 dating;Continental evaporite   
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        发布时间：2022-08-16
      • Chunhan Tong,Guodong Li
        Vol. 13, Issue 8, (1990)
        摘要：The superimposition interferences of fission nuclides and spectral interferences from uranium in neutron activation analysis of La, Lu, Sm, Ce, Nd, Mo, Zr, Ba, Br etc. in geological samples have been studied systematically. The uranium fission coefficiints by thermal and epithermal neutron activation and spectral peaks of 239Np and 147Nd have been determined experimentally. The control of key experimental conditions is described with a discussion about correcting uranium interference in the determination of REE for different geological samples.  
        关键词：Neutron activation analysis;Uranium fission coefficient;Spectral interference;Epithermal neutron activation;Geological sample   
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        发布时间：2022-08-16
      • Tao Jin,A. Q. Murat,Shilian Liu,Shengrong Duan
        Vol. 13, Issue 8, (1990)
        摘要：By the aid of nuclear magnetic resonance and dual wavelength TLC scanner, the absorbed dose distribution in hydrogels containing ferrous sulfate has been measured. The result shows a good straight line between the proton longitudinal relaxation rate and absorbed dose up to 16Gy in agarose gels. It appeared that thin layer of acrylamide is much better than film for obtaining smooth dose curves.  
        关键词：Nuclear magnetic resonance spectrometer;Dual wavelength TLC scanner;Hydrogel;Absorbed dose   
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        发布时间：2022-08-16
      • Xingzhou Jiang,Zhongli Yin,Shumin Zhang,Shujin Wang,Chengjun Ma,Qiang Liang,Zhenkun Li
        Vol. 13, Issue 8, (1990)
        摘要：P and Rh contents in a Rh catalyst (SLPC) have been determined by PIXE technique using Co and Y as internal standards respectively. The results, 1.951% of P and 0.113% of Rh in the catalyst, are very close to the estimated values.  
        关键词：Catalyst;PIXE analysis;Rhodium;Phosphorus   
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        发布时间：2022-08-16
      • Qinghua Zhang,Yiqin Guo,Zhuanfu Li
        Vol. 13, Issue 8, (1990)
        摘要：In this study 100 cases of C. O. P. D were classified according to dialectical method of traditional Chinese Medicine. By infusion lung imaging it was shown that 76 cases were abnormal in blood supply in which the category of "fei xin qi xu" ("weak in heart and lung breath") got the first place and followed by the category of II order "fei qi Xu" ("weak in lung breath"). It was considered that the change in lung infusion imagings were the evidence of "fei xu zheng" ("weak-lunged symptom") "xin xue yu zu"("stasis of heart blood") and might be used to guide the treatment and to observe the efficiency of "huo xue hua yu" ("invigorating blood circulation and eliminating stasis") therapy  
        关键词：Infusion lung imaging;Chinese medical treatment   
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        发布时间：2022-08-16
      • Yuechen Shi,Li Zhong,Jianhua Zhu,Yiguo Zhou,Tong Zhu
        Vol. 13, Issue 8, (1990)
        摘要：Solutions of 99Tc-HMDP and 99Tc-HEDP were prepared by reducing 99TcO4- with excess SnC12 in presence of corresponding chelating agent. The quantity of unreacted SnCl2 was analyzed with I2 standard solution by potentiometric titration. It was found that 99TcO4- is reduced to the+4 state in either 99Tc-HMDP or 99Tc-HEDP at pH~3. The whole experiment was carried out under N2 atmosphere. The UV spectrum of 99Tc-HMDP or 99Tc-HEDP shows that during the iodometric titration 99Tc exists only in one oxidation state and, they are stable in air within 1h.  
        关键词：Oxidation state;99Tc-HMDP(hydroxymethylene diphosphonate);99Tc-HEDP(hydroxyethylidene diphosphonate)   
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        发布时间：2022-08-16
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