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      • Guilin Zhang,Lianfan Liu,Weinan Zhou,Wenxiang Hu,Jiahua Wang
        Vol. 09, Issue 12, (1986)
        摘要：The annealing behavior of supersaturated solid solution Cu-Fe produced by 57Fe Ion implanted into copper film at dose of 1×1016 57Fe at./cm2 have been studied by CEMS. During annealing the transition of γ-Fe phase and isolated iron atoms into α-Fe phase was observed below 440℃. The temperature for vacancies detraped by isolated iron atoms is at about 300℃, and the dissolved α-Fe phase and bulk diffusion temperature is between 520-600℃.  
        关键词：Ion implantation;conversion electron Mössbauer spectroscopy;Radiation damage;Thermal annealing;radiation enhanced diffusion supersaturated soild solution;Cu-Fe alloy;γ-Fe   
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        发布时间：2022-09-13
      • Yuanxun Zhang,Xuepeng Wang,Junfa Qin,Yongxian Wang,Shiming Wu
        Vol. 09, Issue 12, (1986)
        摘要：This paper describes matrix absorption enhancement effects of the thick target in energy dispersive X-ray fluorescence analysis (XRF). Absorption correction methods(5—10mg/cm2) are studied especially for medium thick target. For analysis of hair sample, both the measurement of absorption correction coefficients and the determination of sensitivity factor using addition method are introduced. Quantitative analysis and computer program of medium thick samples are established. The relative deviation between different methods for most elements is found to be less than 5%.  
        关键词：X-ray fluorescence analysis;matrix correction   
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        发布时间：2022-09-13
      • Shilun Guo,Xinlu Deng,Shengfen Sun,Wu Meng,Pengfa Zhang,Xiuhong Hao
        Vol. 09, Issue 12, (1986)
        摘要：The uranium concentrations in natural water collected in the fields of uranium ore exploration with fission track method have been determined. It shows that the results of fission track method are consistent with that of fluoro-colorimetry and laser fiuorometry for the same samples of water with uranium concentration in the region from 10-4 to 10-8g/l. For water samples with lower uranium concentration (≤10-8g/l), the fission track method can still give accurate or referential results. but the other two methods failed. The reproducibility of fission track method has been checked and discussed using samples collected in the same fields of uranium ore exploration. The effects of the concentration of the impurities in natural water on the determination of uranium concentration are analysed and discussed as well.  
        关键词：fission track method;uranium ore exploration;natural water;uranium concentration;Solid state nuclear track detector   
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        发布时间：2022-09-13
      • Tongsheng Yao,Chunhua Guo,Yufeng Zhou,Wenqin Wang,Xiying Ding
        Vol. 09, Issue 12, (1986)
        摘要：This paper described the test of flow balance in fuel assemblies of the pressurized water reactor power plant (300MW) which is the first plant designed and to be built by our country. The resistance matching between parts of the four different structure of fuel assemblies was reasonably settled. The difference of the coolant between them was adjusted to less than 1%. The design of the plug was improved after the test. The dimension of orifice for upper grid plate of the reactor core and resistance coefficients of the outlet for various assemblies have been determined. The test results provide the reliable experimental basis for the thermal-hydraulic and structure design of the Qinshan nuclear power plant.  
        关键词：pressurized water reactor power plant;Fuel assembly;flow balance;flow deviation;resistance matching;Resistance coefficient;control rod guide spacer grid;dampler-ring   
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        发布时间：2022-09-13
      • Kangchu Huang,Jianhua Wu,Cunyi Wang
        Vol. 09, Issue 12, (1986)
        摘要：This paper briefly described the principle and method for the multigated radionuc-lide angiocardiography. By using hardware of multigated circuits we can realize the real time acquisition of 14 images in one R-R wave interval. The block diagram of electronics and the clinical cases also presented.  
        关键词：multigated;Interface;angiocardiography;real time acquisition   
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        发布时间：2022-09-13
      • Daolun Li,Qinmin Fan,Yawen Liu,Chenglain Wei,Huhou Li
        Vol. 09, Issue 12, (1986)
        摘要：Based on the segregation phenomenon of bronze alloys in casting process and the measured surface component of bronze mirrors, we discussed the surface models problem of ancient mirrors.  
        关键词：ancient bronze mirrors;segregation;surface model   
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        发布时间：2022-09-13
      • Jufeng Pang,Guifang Zheng
        Vol. 09, Issue 12, (1986)
        摘要：A new peak area computing method——averaged Quittner method,was reported. It has higher precision and accuracy than old Quittner method, especially for weak γ-ray peak of Ge (Li) detectors. The averaged method also avoids the uncertainty in parametes choosing process.  
        关键词：peak area;averaged Quittner method   
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        发布时间：2022-09-13
      • Weidong Shi
        Vol. 09, Issue 12, (1986)
        摘要：The central and fringe field of a Mobley magnet were measured using nuclear magnetic resonance and Hall voltage differences method. The field uniformity can be raised from ±7×10-4 to ±3×10-4 by adjusting the thickness of spacers between magnetic poles. The effects of the place, thickness, width of the magnetic screen on Mobley magnet fringe field have been observed. The errors between the results of two method are analysed and the accuracy is given.  
        关键词：Mobley magnet;Nuclear magnetic resonance;magnetic field uniformity;Hall element;magnetic screen   
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        发布时间：2022-09-13
      • Zhixiang Xu
        Vol. 09, Issue 12, (1986)
        摘要：This paper destribes the improvement of accelerator performance by using voltage stabilizator. The high voltage stability ΔU/U is raised from 2.3% to 0.81% at target current It=100µA. Target current stability ΔIt/It is raised from 5.2% to 4.4% at It=100μA and terminal voltage U=2MV, and the operation of machine is more convenient with the stabilizator, maintenance time is reduced with it.  
        关键词：voltage stabilizator;electron electrostatic accelerator;voltage stability;target current stability   
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        发布时间：2022-09-13
      • Anquan Le,Liren Jiang,Lianxue Gu,Junquan Xu,Fasheng Han,Yingmei Gu,Jinxin Lin
        Vol. 09, Issue 12, (1986)
        摘要：By means of the X-ray fluorescence technique, the thickness of a plating layer can be measured relatively. With the aid of a microprocessor, the value of the measured(µm) can be printed out directly. The objects of measurement can be cobalt-nickel plating layer on the base of steel or brass and gold plating layer on the base of nickel white copper. The measuring range of thickness is usually 1—6µm with an error of less than ±0.3µm, and the area for the measurement is usually no less than 2 mm in diameter.  
        关键词：thickness measurement by X-ray fluorescence technique;the watch parts;the thickness of plating layer   
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        发布时间：2022-09-13
      • Zhizhen Yang,Jianqiu Jing,Jianhua Yu,Yuanzhuang Gu
        Vol. 09, Issue 12, (1986)
        摘要：Several technical problems of γ-tagged cleaning ball on petroleum pipe are summarized. Among them, the half-thickness of cobalt-60 γ-rays in wet soil, the responsiveness of some Chinese γ-radiation dosimeters to moving γ-source and some distance-protection measures in operation of 1.2×1010 Bq cobalt-60 source in situ of petroleum pipe are reported.  
        关键词：γ-tagged cleaning ball in petroleum pipe   
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        发布时间：2022-09-13
      • Qiyuan Shen,Guozhong Tang,Zili Guo
        Vol. 09, Issue 12, (1986)
        摘要：Dopamine is a neurotransmitter in the central nervous system. (7, 8-3H) dopamine is an important tracer for the study of physiological functions and metabolic processes. It was prepared by catalytic reduction of 3-hydroxy-4-methoxy-8-nitro-styrene with tritium gas. At the end of reaction, hydrobromic acid was added and heated to remove the methoxyl group. The crude product was purified by paper chromatography. The purity of (7,8-3H) dopamine was identified by IR, UV, PC and 3H-NMR spectra. The radiochemical purity was over 95% and the specific activity was 1.26×1012Bq/mmol(34Ci/mmol). The distribution of labelled tritium in molecule was shown as follows: 55.4% at position 7 and 44.6% at position 8.  
        关键词：Tritium labelling;(7,8-3H) dopamine   
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        发布时间：2022-09-13
      • Shouxiang Wang,Ziyuan Chen
        Vol. 09, Issue 12, (1986)
        摘要：The transfer and distribution of the monocrotophos in the water-rice-soil system were investigated by parallel test of micro-soil simulant installation and pot culture. The results revealed that, the remainder quantity of the monocrotophos in the water-rice-soil system was 30 per cent of the total labelled value after 8 days, in which the remainder quantity in the rice plant was 8%, in soil—19%, in leaching water—2%. A notable linear relation was proved to exist between remainder consistency of the monocrotophos together with the metabolite in the micro-soil installation or earthen pot and the depth of soil. The linear regressiongives: Ĉ1=0.4480-0.0116x, r1=-0.9590: Ĉ2=0.4994-0.0159x, r2=-0.8403.  
        关键词：micro soil installation;monocrotophos;Isotope tracer   
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        发布时间：2022-09-13
      • Junfa Qin,Yongxian Wang,Yaoliang Xu,Minqian Li,Shiming Wu,Liebao Yan,Beilian Lu,Shixue Zheng,Yude Cao
        Vol. 09, Issue 12, (1986)
        摘要：The contents of trace elements in hair of 90 longevous females in Shanghai have been determined by using radioisotope source excited energy despersive X-ray fluorescence analysis. It was found that the contents of Sr, Fe, Mn and Ca decreased gradually with the degree of deficient damage. The cecrease of Ni content in Qi deficiency syndrome was also observed. It is appeared that the Ni content in hair may be employed as an index of Qi deficiency syndrome or lung function. In addition, the results of the nonlinear mapping algorithm showed that the contents of Sr, Mn, Fe, Ni and Ti in hair may be useful for differential diagnosis of organ function.  
        关键词：X-ray fluorescence analysis;hair;deficient symptom;Trace elements;Sr;Mn;Ni   
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        发布时间：2022-09-13
      • Jingru Guo
        Vol. 09, Issue 12, (1986)
        关键词：235U target;Irradiation;purification;Identification;Application   
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        发布时间：2022-09-13
      • Taifu Liu
        Vol. 09, Issue 12, (1986)
        关键词：clinical radiobiology;radiosensitization;hyperthermia   
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