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      卷 0 ， 期 0 ， 2020
      • Wenbin Zhang,Dongchen Xu,Bingxue Fan
        Vol. 09, Issue 1, (1986)
        关键词：airborne gamma ray spectrometer survey;uranium prospecting;geological mapping;non-radioactivity prospecting;aero-geophysical survey   
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        发布时间：2022-08-16
      • Zhenxia Wang
        Vol. 09, Issue 1, (1986)
        关键词：Backscattering;mass resolution power;depth resolution power;Time of Flight (TOF);glancing angle   
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        发布时间：2022-08-16
      • Meifen Huang,Shunjuan Mao
        Vol. 09, Issue 1, (1986)
        摘要：The method and apparatus for on-line measuring the coating weight on art paper are described. The design of the coating gauge was based on the technique of characteristic X-ray fluorescence preferential absorption. The gauge was equipped with a TP-801 micro-computer which makes the gauge capable of showing and typing the data in different forms. The measurement is quick, continuous, accurate and non destructive. Analysis period is 10 seconds. In on line measuring, the reproducibility is ±1g/m2 and the relative error of this method amounts to ±5% with the weighing method as a standard.  
        关键词：preferential absorption;on line measuring;art paper;coating weight   
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        发布时间：2022-08-16
      • Yubo Piao,Shuxun Ma,Yongli Ma
        Vol. 09, Issue 1, (1986)
        摘要：A device with double probe driven by a stepping motor is described. It can be used to determine the position and the profile of ion beams. The results of the measurement are compared wite the actual profile of the ion beams.  
        关键词：double probe;Scanning;stepping motor;profile of ion beam   
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        发布时间：2022-08-16
      • Zhiping Cao,Jingxia Zhang
        Vol. 09, Issue 1, (1986)
        摘要：This paper presents a method on improving Cerenkov radiation counting efficiency for 32P, 132I, 45Ca, 35S and 14C radionuclides by using the emulsifier and wavelength shifter mixed solution as medium. The use of this mixed-medium for Cerenkov counting of high-energy β emitters is able to increase the counting efficiency 40% to 50% as compared to the water medium, and even the low-energy β emitters which below the Cerenkov threshold can also obtain higher counting efficiency. It is found that this method shows good stability, strong resistance to chemical quencher. In addition, it is particularly advantageous to large volume of aqueous sample and more convenient for sample preparation. The action mechanism of both the emulsifier and the wavelength shifter in the mixed-medium has also been discussed.  
        关键词：Cerenkov radiation counting efficiency;emulsifier;wavelength shifter;mixed-medium;Cerenkov threshold;chemical quencher   
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        发布时间：2022-08-16
      • Zhenxia Wang,Fuying Zhu,Wenbiao Chen,Dexin Cao,Zuyao Zhou,Hengshan Zhang,Ahu Zhang
        Vol. 09, Issue 1, (1986)
        摘要：Dose dependence in preferential sputtering and altered surface layer of Cu-An alloy has been studied by using thermal-neutron activation and Rutherford backscattering(RBS). The copper-gold sputtering atom ratio SCu/SAu decreases with increasing ion dose. The results of RBS measurement show that the recoil implantation of gold atoms raises with increasing ion dose. The fact suggests that the bombardment of Ar+ ions onto Cn-Au alloy films causes the preferential sputtering of Cu atoms resulting in the depletion of Au atoms in the outmost surface layer and the Au-rich beneath this layer.  
        关键词：thermal-neutron activation;Rutherford backscattering;altered layer   
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        发布时间：2022-08-16
      • Guohua Yang
        Vol. 09, Issue 1, (1986)
        摘要：The chemical exchange systems of СО/aqueous solution of Cu2Cl2·8NH4C1, abbreviated as COCO, and CO2/carbamate in enrichment of 13C were compared using identical experimental devices. The results indicate that the latter system is better than the former, and can be used to produce highly concentrated 13C.  
        关键词：chemical exchange;COCO process;concentration multiple;density of spray;number of theoretical plates per metre;separation capacity;specific volume   
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        发布时间：2022-08-16
      • Anmin Guan,Suifu Wang,Yilin Sun,Haiyang Geng,Weizhong Zhao,Zhenyuan Ni
        Vol. 09, Issue 1, (1986)
        摘要：The emittance of heavy ion beams (Ar+, Si+ and Bi+) extracted from Nielsen source was measured. The measurements of emittance with slit-probe method were performed on a test bench at different positions of the beam line (in front of and behind the annalyzing magnet).The measuring errors of emittance were corrected with different focusing voltages of einzellens.The experimental results showed that the emittances were different with the gap of the extraction, the shape of the plasma boundary and the increase of the ion mass and intensity of ion beams.  
        关键词：Emittance;normalized emittance;Space charge effect;heavy ion beam current;Ion source;extraction voltage   
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        发布时间：2022-08-16
      • Jieqing Zhu,Anquan Le,Yingmei Gu,Fasheng Han
        Vol. 09, Issue 1, (1986)
        摘要：This paper describes a FORTRAN program used for absolute calculation of the thickness of multiple plating layers by means of X-ray fluorescence techniques, where the non-monoenergetic primary radiations and the second and the third fluorescence X-rays are considered.  
        关键词：X-ray fluorescence thickness measurement;absolute measurement;mutiple plating layers   
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        发布时间：2022-08-16
      • yuanfu Xia,Shuxin Wang,Rongchuan Liu
        Vol. 09, Issue 1, (1986)
        摘要：Velocity non-linearity is an important specification for Mössbauer spectrometer. The different way of determining the nonlinearity was discussed and some suggestions were presented.  
        关键词：Mössbauer spectrometer;velocity non-inearity;velocity calibration   
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        发布时间：2022-08-16
      • Yongtang Qi
        Vol. 09, Issue 1, (1986)
        摘要：A drive circuit of the Mössbauer spectrometer has been designed. It can be matched with either a binary multichannel pulse analyser(such as 512, 1024-channel), or a decimal multichannel pulse analyser (such as 400, 800-channel). Using all-digital circuit, the reference waveform generator may freely select different velocity sweep waveform of triangle, sinusoidal and so on. An automatic position fixing circuit is built in the drive circuit so that the equilibrium position of the transducer is kept right in the middle of the electromechanical part.  
        关键词：Mössbauer spetroscopy;eletromechanical transducer;reference waveform generator;drive amplifier;symmetrical triangle velocity sweep;sinusoidal velocity sweep   
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        发布时间：2022-08-16
      • Changmao Chen,Jianlun Xie
        Vol. 09, Issue 1, (1986)
        摘要：This paper describes a method of measuring the dead time of a radiation detecting system using two radiation sources with the same spectrum and structure but different intensity. It can be used to precisely determine the dead time independent from count rates, and the approximate values of the relative intensities of the sources can be obtained.  
        关键词：radiation detecting system;Dead time;modified proportional source method   
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        发布时间：2022-08-16
      • Yuanxian Xia,Hesheng Qian
        Vol. 09, Issue 1, (1986)
        摘要：In this paper the spectrophotometric method for determination of trace amount of thorium in weak acidic medium by chlorophosphonazo-mА is described. The composition of the complex was estimated to be 1:4 by slope ratio method. The apparent molar absorption of thorium at 675 nm is 9.2×104. Beer's law is obeyed for 0—12.0µg of thorium in 10ml solution. The coefficient of variation for thorium is 0.88%. The method has been applied to the determination of trace amounts of thorium in the extraction process of thorium.  
        关键词：developing agent;chlorophosphonazo-mA;Spectrophotometric determination;Thorium   
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        发布时间：2022-08-16
      • Guoqiang Tang
        Vol. 09, Issue 1, (1986)
        摘要：The process prepared by us for producing low-molecular weight PTFE fine powder is characterized by that the suspended PTFE is radiation-degraded with an electron accelerator. The average particle of radiation degraded product may be less than 5µm in diameter with its molecular weight below 30000 and the melting point above 300℃. We also studied the dependance of molecular weight, grain diameter, melting point, density and mechanical properties on radiation conditions. The products are used as plastic and rubber filler, oil densified agent and lubricant. The products owing to their best quality have been widely used in industries such as chemistry, textile and machinery and won good appreciation.  
        关键词：polytetrafluoroethylene;Radiation degradation;low-molecular weight;fine powder   
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        发布时间：2022-08-16
      • Rongfang Shi,Xiujie Liu,Yanqun Wang,Xiuzhen Guo,Kewei Chu,Xudong Hu
        Vol. 09, Issue 1, (1986)
        摘要：A comparative analysis of pulmonary perfusion scanning through cardiac catheterization of 57 patients including 32 patients with congenital heart disease, 8 patients with chronic pulmonary thromboembolism and 7 patients with primary pulmonary hypertension is reported.The lung scintigram obtained with In-113m or Tc-99m-MAA represents the distribution of pulmonary blood. It has been found that the lung scintigram was abnormal in patients of congenital heart disease with pulmonary hypertension (i. e. pulmonary artery pressure between 40—80 mmHg)and the extent of radioactive regional defects is proportional to the level of pulmonary hypertension. The results of the analysis indicated that pulmonary perfusion scanning being a noninvasive technique would be a useful method in evaluation the level of pulmonary hypertension in patiens with left to right shunt before and after surgical operation.  
        关键词：pulmonary hypertension;congenital heart disease;radionuclide defect;pulmonary perfusion image   
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        发布时间：2022-08-16
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