最新刊期
      卷 0 ， 期 0 ， 2020
      • Chen Qing Xia Yuanfu Liu Rongchuan
        Issue 1, (1992)
        摘要：A detector for angle-selective depth-sensitive conversion electron Mossbauer measurement has been established using a channeltron. Either the emerging angle of conversion electrons or the incident angle of γ-rays could be selected. The experimental result implies that the emerging angle selection of conversion electrons could be used as a new way for depth-sensitive Mossbauer measurement.  
          
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        发布时间：2021-04-09
      • Huang Ningkang Feng Zhirong
        Issue 1, (1992)
        摘要：Using the three sweep potential kinetic polarization technique the corrosion behaviour were measured in 0.5 mol/1H2SO4 and 0.1 mol/1 NaCl solutions respectively for Stellite films deposited on the 2Cr 13 stainless steel substrate after treatment by the 190keV N+ bombardment and magnetron controled sputtering. The effects of N+ bombardment on the corrosion properties of the Stellite deposited specimens were studied by RES, XPS and SEM-EDAX analyses.  
          
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        发布时间：2021-04-09
      • Li Guisheng
        Issue 1, (1992)
        摘要：Neutrons are the main shielding object for the heavy ion interaction. In this paper, the concrete shielding thickness of neutrons generated from the medium energy heavy ion interaction were calculated, for a sample of a thick Cu target bombarded with a beam of 100MeV/amu 12C ions at intensity of 4×1011 ions/s. Starting with calculating the neutron multiplicity and accounting for the angular distribution of emitted neutrons, the shielding thickness for different beam current was calcalated.  
          
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        发布时间：2021-04-09
      • Xiang Hongzhuan Han Ming Wang Guanghou Yu Ruixin
        Issue 1, (1992)
        摘要：The radiation effect of high density polyethylene films in the air was studied. The gel content and infrared spectra indicated the competition between cross-linking and oxidation degradation continueously after electron beam irradiation. A preliminary explaination of these results was given.  
          
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        发布时间：2021-04-09
      • He Zhongda Jia Xiang Li Shuzhong
        Issue 1, (1992)
        摘要：The dynamic mechanical properties and thermal behavior of gamma radiation crosslinked LDPE/EPDM blends have been investigated over a temperature range from -50 to 100℃ and-70 to 150℃respectively. The results show that there is a damped peak （tanδmax） of about -20℃ in the dynamic mechanical spectra, and the peak temperature is denoted as Tβg, but the damped peak in low temperature region for each of LDPE and EPDM in blends disappeared. After irradiation, the Tβg of the LDPE/EPDM blends still appeared on the spectra, and gamma radiation does not affected the compatibility of LDPE and EPDM. The thermal analysis results reveal that the fusion temperature Tm of irradiated LDPE/EPDM systems decreases with the increase of radiation doses.  
          
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        发布时间：2021-04-09
      • Cheng Yulin Lin Junying Zhang Bufa Lu Rong Zheng Liping
        Issue 1, (1992)
        摘要：CSR and polycarbanate （PC） track detectors ha-ve been used for measuring fast neutron fluences ranging from 106 to 1011n/cm2. A comparative study of two different modes （the internal and external radiator） of fast neutron measurements based on SSNTDs is presented. Results show that the CSR plastic detector can be used successfully for detecting 14 MeV neutron fluences in the range from 5×107 to 6×1010n/cm2. The detection efficiency of the CSR is on the average 2.88×10-5 tracks per neutron and the CSR with polyethylene（PE） radiator is 3.32×10-5 tracks/a The detection efficiency of the PC detector with a thin layer of uranium is 1.75 × 10-6 tracks/n for detecting fast neutron fluences in the range from 2.5×107 to 5×1010n/cm2.  
          
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        发布时间：2021-04-09
      • Song Zhongheng Zhang Zhenhai Wang Xiaomin
        Issue 1, (1992)
        摘要：The modified PARMELA code is used in the calculation of three dimensional motion of charged particles in the pulse RF electron accelerator. The RMS emittance of the beam and characteristics of ring type resonant cavity with the beam are given, and emittance change in the beam pipe with the solenoid is discussed.  
          
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        发布时间：2021-04-09
      • Li Lu Lin Fenzhi
        Issue 1, (1992)
        摘要：This paper is about the preparation method of ACC. The finely divided barium carbonate-14C is used to react with sodium azide to obtain potassium cyanide-14C. From potassium cyanide-14C, the derivative of p-bromo-benzoic imine of glycine-14C is synthesized. The derivative is dissolved in DMF containing anhydrous K2CO3.The mixture is refluxed with 1.2-dibromo-ethane extracted and depurated under absolute ether. The residure is hydrolyzed by refluxing with 2mol/l HCl. Finally the 1-amino-cylopropane-l-carboxylic acid（ACC） is obtained. The yield of K14CN, 14-Gly, 14C-ACC are 94.3%, 90%, 52% respectively. The ACC is purified and both the chemical purity and radioactive purity of ACC are 99%.  
          
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        发布时间：2021-04-09
      • Tang Guozhong Zhao Xialing Zhou Meiying Yin Linxiang Yang Jianzhong Hu Gensheng
        Issue 1, (1992)
        摘要：Using triiodothyronine derivative（T3X） and Na 125I as starting materials, 125I-T3X and 125I-T4X were synthesized by the chloramine-T method and separated by HPLC. The specific activity of products was 16.87-31.78GBq/mg for 125I-T3X and 3] 15-46.07 GBq/mg for 125I-T4X. The tracers have been used in the direct method of RIA for free T3 and free T4 in serum. It’s proved that the derivative, chemically modified to inhibit its binding to the endogenous serum proteins, still remain original binding characteristics of T3, T4 with the specific antiserum.  
          
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        发布时间：2021-04-09
      • Luo Daling Huang Naiming Zhang Chunxiang
        Issue 1, (1992)
        摘要：Dose responses of thermoluminescent LiF（Mg, Cu, P） to gamma rays radiation have been investigated with a FJ-377 TLD reader which is interfaced to an Apple Ⅱ microcomputer. Sublinear responses of glow peak 1, peak2 and peak3 of the TLD have been obtained. Based on statistical distribution and hit concepts in microdosimetry, a function of TL response to gamma rays was proposed. The function implying a combination of 1-hit and 2-hit responses is a very good decription of TL response of linerarity, sublinearity and supraliearity. Parameters used in this model consist of characteristic dose Do and faction R for 1-hit detectors. Experimental results are in good agreement with the model calculation.  
          
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        发布时间：2021-04-09
      • Li Mianfeng Luo Daling Bai Ying Liu Fusheng Chen Qijin Zhang Chunxiang
        Issue 1, (1992)
        摘要：The radiation responses of prodenia litura nuclear polyhedrosis viruses（NPV） to gamma-ray and electron-beam have been investigated by measuring survival fraction and electron spin resonances（ESR） of irradiated samples. lonization radiation can produce long lived free radicals in NPV and its concentration is proportional to dose of radiation. The curves of survival fraction with either dose of radiation or concentration of free radicals were shouldered. Radiation damage mechanism of NPV have been studied by the correlation between survival fraction, free radical concentration and dose of radiation. It is posible to use ESR method for determing infectivity of NPV instead of biology assay.  
          
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        发布时间：2021-04-09
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