最新刊期
      卷 0 ， 期 0 ， 2020
      • Mao Yu Wang Zhishan
        Issue 10, (1992)
        摘要：The beam transmission factor through a collimator and calculation method of ion beam optics for a beam line are discussed . Comparisons are given between the calculated and the experimental results, showing a good agreement with each other.  
          
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        发布时间：2021-04-09
      • Wei Luncun Yang Xihong Liang Bin Li Renxing Yu Jinxiang
        Issue 10, (1992)
        摘要：In this paper advantages and disadvantages of the 12C RBS over the conventional 4He RBS in mass resolution, depth resolution and detection sensitivities are discussed. The experimental results of the diffusion behavior of the YBa2Cu3O7/SrTi03 studied by using the 12C RBS are given.  
          
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        发布时间：2021-04-09
      • Wang Jingcheng Liu Dajun
        Issue 10, (1992)
        摘要：Measurements of the S - lineshape parameter of Doppler broadening were conducted for Fe -22at%Al, Fe-25at%Al and Fe -28at%Al alloys treated, with the same processes. The results show that the more the alloy’s Al - content, the higher its vacancy concentration remains after quenching from high temperatures; vacancies recover faster for Fe-25at%Al and Fe -28at%Al than for Fe-22at%Al. The present experiments explain why the three alloys with slight difference in constitution need to be treated by different processes to obtain each other’s own good properties.  
          
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        发布时间：2021-04-09
      • Zhang Ning
        Issue 10, (1992)
        摘要：An experimental evidence was presented of the nonlinear relationship between the loga-risthmic neutron transmissivity and humidity for the transmission - type neutron moisture gauges. By taking account of this nonlinear dependence the accuracy of experimental results was improved .  
          
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        发布时间：2021-04-09
      • Li Xingyue Cai Jianhua
        Issue 10, (1992)
        摘要：The dose distribution in an angioma treated with a surface photon source was calculated by using Monte Carlo method . The photon energies ranged from 10 to 366keV,The results showed that photon energy should be near 30 keV in actual treatment. This photon energy can result in a good curative effect and is relatively safe for normal tissue under the angioma. Thirty odd cases of angioma with several centimeters was treated with125I and most of them had very good curative effects. No skin ulceration was found.  
          
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        发布时间：2021-04-09
      • Deng Jianguo Yu Zengliang Qiu Lijian
        Issue 10, (1992)
        摘要：The radicals induced by nitrogen ion beam irradiating UNA and its bases have been studied with ESR method. The experimental results show that the induced radicals at room temperature are ionic. Concentrations of the radicals for different samples increase with increasing ion dose. Various samples have been tested with ESR method during the stored time of more than one month under the dry conditions at room temperature （10-20℃）, no big change was observed for the radicals, showing a quite long life.  
          
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        发布时间：2021-04-09
      • Zhang Wanxi Li Shuzhong He Zhongda Xu Jun
        Issue 10, (1992)
        摘要：The effects of irradiation on polyethersulfone with cardo group （PES-C） were studied. It was found that PES-C can crosslink by γ - irradiation under vacuum and the crosslinking degree at 300℃ is higher than that at room temperature. The gelation dose of PES-C are 6. 6 ×105Gy at 25℃ and 6×104Gy at 300 ℃ respectively.  
          
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        发布时间：2021-04-09
      • Shen Chaohong Bao Borong Wang Gaodong Qian Jun
        Issue 10, (1992)
        摘要：The extraction of uranium （Ⅵ） , thorium （ Ⅳ） and nitric acid as a function of aqueous HNO3 concentration, extractant concentration and temperature is studied with N-（2-ethyl-hexyl） caprolactam. The extracted species and enthalpy of extraction reaction are evaluated . The third phase formation in extraction of U（ Ⅵ）is also studied. In addition ,back extraction behavior of U（Ⅵ）and Th（Ⅳ）from organic phase is tested . The results obtained are compared with those obtained by using TBP at the same experimental conditions.  
          
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        发布时间：2021-04-09
      • Hu Fang Li Yongjian
        Issue 10, (1992)
        摘要：Synthesis of 6-bromo-L-dopa was studied. As a product of straightforward eletrophilic bromination of L -dopa ,6- bromo - L - dopa was obtained when the reaction temperature was in the range of 25 to 30℃. Purity and structure of the product were identified by HPLC, NMR and MS .  
          
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        发布时间：2021-04-09
      • Yang Yongnian Tang Lingfang
        Issue 10, (1992)
        摘要：The acute toxicity test showed that the oral LD50values were >21500mg/kg for male and female mice, indicating that irradiated pollens belong to low toxicity grade or practically non-toxic . Mutagenicities were studied in three short-term tests. Ames test showed that ir-radia-ted pollens did not induce mutation towards strains TA98, TA97,TA100and TA102. Mi-cronucleus test in the bone marrow cells indicated that the percentage of polychromatic ery-throcytes with micronuclei in exposed groups had no significant difference in comparison with the controlled ones . Chromosomal test for reproduction cells showed that the increase of chromosomal aberration rate was not observed . All the above results suggest that irradiated pollens are safe for human consumption.  
          
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        发布时间：2021-04-09
      • Huang Qingquan Xia Zhenmin
        Issue 10, (1992)
        摘要：A two-system-PC method has been established for the determination of RCP of 99mTc-DTPA injection. As a quality control standard of 99mTc-DTPA injection, the method has an advantage of no need to determine the biological residues .  
          
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        发布时间：2021-04-09
      • Zhang Nianbao Xie Binghua
        Issue 10, (1992)
        摘要：The development and application of the radiation-induced labelling method are described. The method is an especial technique for preparing tritium labelled compounds. Since Wilzbach’s gas exposure method was set up in 1957,much improvement has been made such as high frequency electrical dis-charge method, microwave discharge activation （MDA） method and ion beam tritium labelling method. Because of its distinctive features and the use of tritium nuclear resonance spectroscopy （3H-NMR） ,the radiation-induced labelling method has become in common use for preparing tritium labelled compounds.  
          
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        发布时间：2021-04-09
      • Chang Hongjun
        Issue 10, (1992)
        摘要：Radiation therapy has made marked progress following introduction of high energy X rays, gamma rays and electron beams. Nevertheless, there still remains a substantial numbers of patients suffering from the failure of local tumor control. The high LET radiations including fast neutrons, heavy ions and negative pions might be expected to offer a therapeutic gains as compared to those as mentioned above. The rationale for introducing fast neutron therapy mainly is its radiobiological properties that are potentially superior to those of photons and electrons. The tumor types or sites for which a benefit is observed are outlined . Results of clinical trials of high LET radiations therapy are also listed.  
          
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        发布时间：2021-04-09
      • Li Deming Zhang Xilin Shen Ligong Zhang Yuexiang Lu Xiangshun Chen Maobai
        Issue 10, (1992)
        摘要：A non-electrical shimming of magnetic field has recently been completed in the SINR minicyclotron AMS. After shimming five times , deviation of the isochronous field is 1×10-4 -3×10-4. The accumulated maximum phase shift of the central particle is about ±10°under high harmonic operation of 16 and with turn number of 100. Amplitude of the first harmonic has been lowered down to less than 1×10-4T. It tooks only 50 minutes for the magnetic field measuring device to get a whole map of the magnetic field with 1° step.  
          
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        发布时间：2021-04-09
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