最新刊期
      卷 0 ， 期 0 ， 2020
      • Xiaofeng Zao
        Vol. 05, Issue 5, (1982)
        摘要：The finite element method for calculating saturation magnetic field of H-120 cyclotron main magnet using the vector potential over a wide region was described in this paper. The simultaneous non-linear equations which were finally deduced were solved by Newton-Raphson iterative method with a small increment (the increment of surrent density) . LDLT analysis method was used in every step.Comparing the values calculated with those measured, it was found that the errors of the field distribution calculated were less than 1%.  
          
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        发布时间：2022-08-16
      • Qingchang Yu
        Vol. 05, Issue 5, (1982)
        摘要：The beam optics of the doubly-focusing uniform-field magnets is studied. The doubly-focusing condition of the magnets for axisymmetrical incident and emergent beams is obtained. The relations among the characteristic lengths of object-waist and the image-waist, object distance, image distance, entrance angle, exit angle and deflection angle are derived. The correction for the finite extent of the actual fringing-field is considered.  
          
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        发布时间：2022-08-16
      • Yongyue Liu,Xiaoyu Gao
        Vol. 05, Issue 5, (1982)
        摘要：The influence of heating time and the response of hydrophone on the time structure and the amplitude of acoustic signal were analysed. The pressure experience fomula P=KECs2/2Cp (τCs+d0+d) in the near fields was drawn from experimental laws. The limits which thermoacoustic theory can be used were discussed.  
          
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        发布时间：2022-08-16
      • Lanzhen Guo
        Vol. 05, Issue 5, (1982)
        摘要：In textile industry, in order to guarantee the standard evenness of the slivers drawn by the high-speed drawing frame, the slivers must be tested and controlled before they are intaken into the drawing frame. Voltage signals indicating the weight changes of the slivers can be gained by measuring the β ray intensity of 90Sr radioactive source passing through the slivers with a scintillation detector is used. The measuring precision of 1% (of the weight of slivers) can be obtained.  
          
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        发布时间：2022-08-16
      • Shengkang Liu,Shuxin Wang,Jirong Jin,Qigao Xu,Weifeng Ying
        Vol. 05, Issue 5, (1982)
        摘要：The methods for measuring moisture of a small sample by thermal neutron transmission and scattering are described, and it is proved to be applicable by the experiment of a small sand-water sample. The devices are also described.  
          
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        发布时间：2022-08-16
      • Daogang Wang,Qilu Luo,Guanlu Huang
        Vol. 05, Issue 5, (1982)
        摘要：This paper describes a method——vapor phase growth of HgI2 crystal after high purity element synthesis. Primary impurity content in the high purity HgI2 crystal obtained is only in the order of ppm. The room-temperature nuclear radiation detector made by this HgI2 crystal has been used to detect gamma-ray spectrum of 55Fe, 109Cd, 125I, 241Am.  
          
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        发布时间：2022-08-16
      • Wanhui Zheng,Jinzhou Zhang,Jiabi Zhu,Jiaqi Tian,Jiahui Gu,Guifen Zhou
        Vol. 05, Issue 5, (1982)
        摘要：The construction and some characteristics of the Si (Au) semiconductor electron spectrometer were described. The sensitive volume of the detector was greater than 20mm2×2.2mm. The energy resolution was 2.6keV for 1063keV K-conversion line from 207Bi decay.  
          
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        发布时间：2022-08-16
      • Yunmin Sun
        Vol. 05, Issue 5, (1982)
        摘要：Several vacuum evaporating techniques and parting agents were tested in order to prepare the stripper foil for accelerator. The transmittance was measured at different monochromatic light during the evaporation to monitor the thickness of the carbon foil. The method of measuring the resistance value of carbon foil on a slide was tested to mark a scale of the thickness of carbonfoil.  
          
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        发布时间：2022-08-16
      • Nina Jiang,Guoqiang Zhu
        Vol. 05, Issue 5, (1982)
        摘要：Instead of a NaI (Tl) crystal gammer ray counter, a liquid scintillation counter made in China was used for measuring 125I in RIA. An electron density increaser——lead acetate was added to the scintillator liquide. The counting efficiency was about 60% and the background was about 60 cpm.  
          
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        发布时间：2022-08-16
      • Shengbao Qian,Rongzhen Cao,Chuanpeng Wang,Mingsheng Chen,Yueling Tao
        Vol. 05, Issue 5, (1982)
        摘要：85Sr is prepared from target of molten RbCl bombarded by 13.6MeV deuteron particles. The irradiated target is dissolved in 0.1N hydrochloric acid or hot water.The solution is purified by passing through 732 cation exchange. Tests of the products were carried out.  
          
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        发布时间：2022-08-16
      • Junfang Xiong
        Vol. 05, Issue 5, (1982)
        摘要：A radioisotopic light source by 14C exitation has been made. The radioisotopic light source has been used in photometric analysis. The stability and accuracy of the new photometric system are better than that of the conventional instruments. The data are given directly in digital.Uranium and iron samples have been measured. For iron detection limit of 0.2µg/ml, detection range of 0.4~100μg/ml and measuring precision is better than ±5%were achieved.Thes result were consistent with that obtained by using conventional light source.  
          
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        发布时间：2022-08-16
      • Daming Chen,Minglü Ye,Tinghua Li,Baoyu Xu,Xintai Li,Qizong Qin
        Vol. 05, Issue 5, (1982)
        摘要：The effect of CW CO2 laser radiation on the extraction rate of the uranyl ion in the TBP-HCl and TBP-HNO3 systems were investigated. The influences of laser power and various frequencies on the extraction rate of the uranyl ion were measured. It was found that the extraction rate increased with laser power and the effects of irradiation at various frequencies by CO2 laser were similar to that by CO laser. It might be explained by zone heating of extraction system. At the beginning of the extraction the transfer rate of the uranyl ion from aqueous solution into the organic phase followed a first order reaction.  
          
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        发布时间：2022-08-16
      • Huhou Li
        Vol. 05, Issue 5, (1982)
        摘要：The alpha emiter 216Po has a half life of only 0.15 seconds comes immediately from 220Rn. The number of cascade pairs was counted by a special equipment and the cascade pairs counting rate thus obtained was served as a measure of the thorium contents in the sample. The validity of results was comfirmed.  
          
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        发布时间：2022-08-16
      • Yuanzhuang Gu,Baoquan Zhang,Xiannian Liu,Wenzheng Sun
        Vol. 05, Issue 5, (1982)
        摘要：This α-monitor has a detection efficiency around 50%. It can show clearly an α-counting of 100 particles/ (100cm2 • 2π • minute) , which is the maximum permissible level recommended.  
          
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        发布时间：2022-08-16
      • Tiemei Chen
        Vol. 05, Issue 5, (1982)
        摘要：Radiocarbon dating involves a comparison of the specific β-activity of the sample (A) with that of the modern reference standard (A0) . The age of the sample is given by: T=82671n (A0/A) (year) . As the sample and the standard are prepared and counted in the same way, it is usually only the statistics of counting is taken into consideration. However, in practice, errors introduced in experimental techniques are not the same for sample and standard. Some foreseeable sources of errors in liquid scintillation counting are investigated in this paper. An overall precision in the activity-ratio A0/A of about 0.5% is achieved.  
          
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        发布时间：2022-08-16
      • Longbo Lu
        Vol. 05, Issue 5, (1982)
        摘要：In this paper a design for x-ray radiation shielding head piece of BJ-10 medical electron linear accelerator is presented. A simplified shielding calculation is derived by neglecting scattering and other factors.  
          
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        发布时间：2022-08-16
      • Huifang Ma,Zhenguo Yang
        Vol. 05, Issue 5, (1982)
        摘要：In this paper, the preparation of thin and thick films of lead by electrodeposition from organic solution is described.  
          
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        发布时间：2022-08-16
      • Baoshan Yang,Shan Cui,Jinzhong Yang
        Vol. 05, Issue 5, (1982)
        摘要：In order to meet the needs of 600kV cockroft-walton accelerator, a radiofrequency ion source using 15MC/s and 300 watts osicillator has been constructed with transverse magnetic field.Two constructions of this source is discribed and the operational characteristics are given.An ion beam current of 5mA at 5kV extraction voltage has been obtained with gas flow of less than 25cc/h and operating life of more than 100 hours. At accelerating voltage of 400kV, the beam current at the target which is about 4m from the outlet of the source is 2.2mA.  
          
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        发布时间：2022-08-16
      • Binggan Hao
        Vol. 05, Issue 5, (1982)
        摘要：A rotatory target of a 5cm diameter was described. Its rotatory speed was about 40~360 rpm.The experimental result showed that the neutron intensity from reaction T (d, n) 4He can be reached to (4.83±0.10) 1011n/s. The energy and intensity of the incident d particles was 400keV and 2.7mA respectively. The half-life of the target was 10 mAh.  
          
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        发布时间：2022-08-16
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