最新刊期
      卷 0 ， 期 0 ， 2020
      • Shi Li,Yinhua Li
        Vol. 12, Issue 10, (1989)
        摘要：The µSR technique is one of the new techniques developed in recent years. In this report, the theory and the experimental techniques of µSR are described firstly, then a comparison of µSR with Mössbauer effect in the measurements of spin fluctuations and internal fields in magnetic materials has been made. The applications of µSR in magnetism are presented.  
        关键词：Muon spin rotation;Mossbauer spectroscopy;hyperfine field;Relaxation;Spin fluctuations   
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        发布时间：2022-08-16
      • 雨人 刘,亚丽 谢
        Vol. 12, Issue 10, (1989)
        摘要：本文综述了同位素水文学技术在黄河上应用25年的效果, 同时介绍了在研究和应用工作中取得的经验, 并展望了未来.  
        关键词：含沙量;流量;示踪剂;稀释法;颗粒级配;河床质;悬移质   
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        发布时间：2022-08-16
      • Chengru Shi,T.A. Tombrello
        Vol. 12, Issue 10, (1989)
        摘要：The nature of defects in vitreous fused silica induced by implanting with 1—17 MeV 35C1 and 19F ions have been investigated and compared with the results obtained after 2 MeV protons or 0.633 MeV γ-rays irradiation using ESR and optical absorption techniques. The surface cracking caused by MeV heavy ion-bombardment was found. No cracks were seen for 2 MeV protons. The contraction in MeV heavy ion implanted vitreous fused silica was observed. The volume change is about 0.36%　at an ion fluence（17MeV 35C1+4）of 1×1015 35C1 cm-2.  
        关键词：Ion-implantation effect;Radiation damage;Fused silica   
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        发布时间：2022-08-16
      • Wong Man-yin Tso
        Vol. 12, Issue 10, (1989)
        摘要：The method we used is similar to the dating of sherd samples with some modification to minimize the damage to the delicate pottery but still produce a reasonable accurate result.During the past year, ?? have done 31 samples successfully. Most of them claimed to be 1100—4500 years of age. After testing, nineteen samples showed out to be compatible with the claimed age. The general procedures and the encountered problems for the assay are described.  
        关键词：Thermoluminescence;Age estimation;Ceramics   
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        发布时间：2022-08-16
      • Zhibin Zhang,Di Chen,Yong Guo
        Vol. 12, Issue 10, (1989)
        摘要：A calibration procedure in a photon beam for a tissue-equivalent ionization chamber is described. To verify the calibration we also measure the volume of cavity and obtained the mass of gas in the cavity directiy using gas density. The agreement between the two methods is better than 0.5%, showing that the procedure and the physical parameters used in the calibration are proper. The method used for measuring the mass of gas in the cavity is also valid for the experimental determination of (WC/e) • Sm,g.  
        关键词：Tissue-equivalent ionization chamber;Absorbed dose calibration factor;Hysteresis;Correcting factor   
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        发布时间：2022-08-16
      • Dakuan, Sun,Zhixiong Feng
        Vol. 12, Issue 10, (1989)
        摘要：Temporary biological dressings used for burns are highly effective and important. In this paper are discussed the effects of dose, dose rate, storage temperature, death time and enzyme survivors on the properties of porcine xenografts. In addition the porcine xenografts impregnated with silver ions, possessing both bacteriostatic and bactericidal properties, have been detailed.  
        关键词：Xenograft;Homograft;Burns;Biological dressing;Porcine-xenograft impregnated with silver ions;Oxygen consumption   
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        发布时间：2022-08-16
      • Dexun Shen,Congqun Yang,Fangxin Yang
        Vol. 12, Issue 10, (1989)
        摘要：The dose monitor and control system for electron beam and X ray on a 20 MeV medical linear accelerator is described. The system is composed of a transmission parallel-plate ionization chamber with appropriate electronic circuits. The thin foil electrodes (0.05mm) of the chamber are suitable for dose monitoring and measurement of high energy electron beam and X rays. The experimental results show that this system, with excellent linearity, is stable, reliable and fulfils design requirements.  
        关键词：Parallel-plate ionization chamber;Dose monitoring and control   
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        发布时间：2022-08-16
      • Zengliang Yu,Ping Xu,Jianjun He,Jun Zhou
        Vol. 12, Issue 10, (1989)
        摘要：IS-A type 10cm duopigatron ion source that was made for heating plasma in the HT-6M Tokamak has high current, high power and high proton composition. A variety of gas ion beam can be extracted from the ion source for different purposes. The geometry and experimental conditions of the ion source versus plasma parameters were studied in detail, and the preliminary applications in other fields were also presented.  
        关键词：Duopigatron ion source;Ion beam;Ion implantation breeding;Ion beam mixing   
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        发布时间：2022-08-16
      • Sike Xia,Ruzhang Ma
        Vol. 12, Issue 10, (1989)
        摘要：The Mössbauer effect of YBa2Cu2.88Fe0.12O7-δ high Tc superconducting oxide has been studied. The valence of Fe and its environment have been determined experimentally and by the calculation using point charge model. Fe has three sublattices sites Fe(1), Fe(2) and Fe(3). Fe(1) and Fe(3) occupy the sites Cu(1) in YBa2Cu3O7-δ oxide, but the distribution of oxygen around Fe(1) is different from that around Fe(3). Fe(2) occupies the sites Cu(2). Fe(1) and Fe(2) are low spin Fe+3, while Fe(3) is high spin Fe+3. Doping of iron brings some extra oxygen atoms that occupy non-Cu-O chains in (001) planes in Y-Ba-Cu-O system. This makes the lattice tend to tetragonal structure.  
        关键词：High Tc superconductor;57Fe;Mössbauer spectrum   
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        发布时间：2022-08-16
      • Zhongbao Ye
        Vol. 12, Issue 10, (1989)
        摘要：The instrument consists of an argon-filled well type ionization chamber, a MOSFET electrometer and a Z80 microcomputer. It can measure the activity of tens of common nuclides such as 226Ra, 60Co, 137Cs, 32P, 99mTc, 113mIn, 125I and 131I. It can be used as a calibrated instrument when the production and applications of radioisotopes are involved. The result of measurement are displayed in 4-digits. The instrument can storage 91 assayed data and print out the data automatically.The operating range is 3.7 Bq to 3.7 GBq for 226Ra. The functions of this instrument include correction for nuclear decay, background subtraction and automatical detection of trouble.  
        关键词：Radionuclide;Ionization chamber;Microcurrent measurement;Activity Z80 microcomputer   
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        发布时间：2022-08-16
      • Yifang Ye,Fuzeng Yao,Jufang Sun
        Vol. 12, Issue 10, (1989)
        摘要：The 35S-labelled tetramethyl thiuram disulfide has been prepared by using sodium (35S) sulfate as primary material through forming the two intermediates (H235S and C35 S2) . The chemical and radiochemical yield and purity are over 85% (based on CS2) and 99% respectively. The specific activity is 0.16GBq/mmol.  
        关键词：35S labelling;Tetramethyl thiuram disulfide   
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        发布时间：2022-08-16

        研究论文

      • Liguo, Cao,Yimin Ding,Qi Ao
        Vol. 12, Issue 10, (1989)
        摘要：For lower energy characteristic X-ray, the slope of absorption curve is much larger in the range of thin-layer. By making use of this advantage: the thickness of a thin-layer absorber can be gauged with a high sensitivity.The principle of the method and the experimental results are described. The correctness and the feasibility of the method have be verified in this work.  
        关键词：Thin-layer thickness gauging;X-ray fluorescence absorption method   
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        发布时间：2022-08-16
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