最新刊期
      卷 0 ， 期 0 ， 2020
      • Anquan Le,Jieqing Zhu,Junquan Xu
        Vol. 05, Issue 4, (1982)
        摘要：This paper describes an X-ray fluorescence technique used for measuring thickness of ultra-thin coated layers absolutely and nondestructively with the non-monoenergetic primary radiation from a radioisotope source. It has been found that the precision for the layer-thickness measurements is better than 1.1%, and the relative deviation is less than 3.8% when the measured results are compared with those obtained from an α-ray thickness gauge based on the air equivalent method.  
          
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        发布时间：2022-08-16
      • Hongqi Yin,Guanlian Jin,Jiwen Cao
        Vol. 05, Issue 4, (1982)
        摘要：A yellow precipitate, formed by adding BPHA (N-benzoyl-N-phenylhydroxylamine) into Ti (IV) solution containing trace amount of Pa (V) , can carry almost completely Pa (V) from 6 N hydrochloric acid. The precipitate is dissolved in 1% of BPHA in chloroform. By re-extracting with 0.25 M NH4F from the organic phase a good radiochemical purity can be obtained. The protactinium content is determined by counting activity.  
          
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        发布时间：2022-08-16
      • Qidong Li,Suiyuan He
        Vol. 05, Issue 4, (1982)
        摘要：The adsorption characteristics of airborne radioiodine on the impregnated charcoal were studied of partial adsoption isotherms (range of concentration of iodine was 1~20 ppm V/V) was measured of it was linear at the beginning rose slowly and reached saturation at last. By method of extrapolation the adsorption capacity corresponding to of extreme low concentration was obtained below 2 ppm. The adsorption capacity was used to evaluate breakthrough time of impregnated charcoal for removing iodine. The dependences of adsorption efficiency on the ambient conditions (temprature, relative humidity, and superficial velocity) were studied.  
          
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        发布时间：2022-08-16
      • Yunfang Xing,Xiaopin Chen
        Vol. 05, Issue 4, (1982)
        摘要：This paper discribes the effect of different kinds and volumes of medium on the counting efficiency by Cerenkov radiation with liquid scintillation spectrometer of type YS-2, which was made by our institute. The emphasis is put on the relation between the concentration of emulsifier solution and counting efficiency. We found the 32P peak of counting efficiency is at the place where concentration is about 77% (efficiency is about 65%) . The experiment proves that 32P counting in emulsifier solution by Cerenkov radiation has good stability both in time and temperature.  
          
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        发布时间：2022-08-16
      • Zhilian He,Yubao Wang
        Vol. 05, Issue 4, (1982)
        摘要：This paper discribes a safe protective apparatus for intravenous injection and subdivision of radionuclides, which is designed by ourself. It consists of a syringe lead shell, a lead shielded locker and two lead glasses. It is very easy to produce and operate. The practical use shows that the dose rate received by the operator is near the level of natural background.  
          
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        发布时间：2022-08-16
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