最新刊期
      卷 0 ， 期 0 ， 2020
      • Zhao Huanzhen Zhang Haitao Jin Yuren Zhang Lixing
        Issue 1, (1997)
        摘要：Batch experiments show that the D301-DHDECMP resin has a high exchange capacity for Nd 3+ and Eu 3+ and the exchange epuilibrium can be obtained in one minute.The relationship between the distribution coefficient and solution acidity is similar to that of DHDECMP.Infrared spectra and kinetic study show that the bonding sites of the resin are mainly phosphoryl.  
        关键词：DHDECMP;Chelating resin;Lanthanide;Actinide   
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        发布时间：2021-04-09
      • Issue 1, (1997)
        摘要：研究了１１０ｋｅＶＮ＋轰击Ｔｉ／Ｓｉ３Ｎ４和Ａｇ／ＡＬ２Ｏ３后界面间所发生的变化。结果表明，离子束混全技术大幅度提高了陶瓷基体上金属膜的附着力，在界面处发生了原子级混合，这为解释附着力的“增强效应”提供了科学依据，金属薄膜的沉积及后续的离子轰击明显地减少了陶瓷裂纹的形成  
        关键词：离子束混合;Ti／Si3N4;Ag／AL2O3;金属－陶瓷附着力   
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        发布时间：2021-04-09
      • Issue 1, (1997)
        摘要：用归一化含量计算方法求取异形试样中的合金成分，并用不同能量激发源发同一试样，根据归一化含量的差别，判别镀层或均匀试样  
        关键词：X射线荧光分析;贵金属合金;贵金属镀层   
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        发布时间：2021-04-09
      • Wang Guicheng
        Issue 1, (1997)
        摘要：A calibrator of ns/ps BPM（beam position monitor） is reconnended for calibrating the electrical center of beam line in NSRL（National Synchrotron Radiation Laboratory）. The functional circuit which can puovide a recision of 0.5 μm is presented as well.  
        关键词：Super short pulse（ns/ps）;Beam position monitor;Calibrator   
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        发布时间：2021-04-09
      • Ge Liangquan 1 Zhang Ye 2 Cheng Yexun 2 Zhou Sichun 1 Xie Tingzhou 1 Hou Shengli 2 1
        Issue 1, (1997)
        摘要：The basic principle of radioisotope X-ray fluorescence logging technique has been described.Some practical methods for correcting unevenness effects,drilling fluid effects and matrix effects are presented.A test on strontium deposit showed that relative errors between thicknesses and average ore grades of the strontium seams determined by X-ray fluorescence logging and by traditional core-chemical analysis are less than 10%,which can meet the requirments of reserve calculation standard.It is also shown that the consuming time for X-ray fluorescence logging is much less than that for traditional methods.  
        关键词：X-ray fluorescence logging;strontium deposit   
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        发布时间：2021-04-09
      • Dong Mo Cao Rongzhen
        Issue 1, (1997)
        摘要：Methy1 3H] thymine was synthesized from 5 formyluracil by the “two-stepmethod”.As the first step,5 [hydroxymethy1 3H] hydroxymethyluracil was prepared with specific radioactivity of 1.6PBq/mol.Then [methy1 3H]thymine was synthesizedvia enzymatic reaction with specific radioactivity of 2.2PBq/mol.The radiochemical purity of the product was over 95%.  
        关键词：Tritium labelling;Thymine;Thymidine   
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        发布时间：2021-04-09
      • Tian Yuhong Liu Kai Zhent Suhua Wang Ruiguang Zhang Yuhui
        Issue 1, (1997)
        摘要：The total reflection X-ray fluorescence（TERF）analysis technique is introducedbriefly.A small TXRF analyzre charactreised by doubld path X-ray exciting sources and stecially short optical path （15cm） is described. Low minimum detection limit（MDL）,e.g.7pg for Co element under Cu target tube operating at 20kVand 6mA and 30pg for Sr under Mo target tube at 46kV and 10mA,is achieved. Some analysis experiments for tap water,marine animal and human hair are performed and the resrlts are given.  
        关键词：Total reflection;X-ray fluoresence;High sensitivity;Multielement analysis   
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        发布时间：2021-04-09
      • Guo Qi Ren Diyuan Fan Long Lu Wu Yu Xuefeng Yan Rongliang
        Issue 1, (1997)
        摘要：TOtal dose effects and annealing properties of CMOS analog-to-digital converter ADC0816 irradiated by 60 CO-γ rays and electrons are investigated.Radiation susceptive characteristics and components as well as failure mode are discussed in terms of the radiation damage mechanism analysis of this device.  
        关键词：Analog-to-digital comverter;Radiation effect;Annealing   
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        发布时间：2021-04-09
      • Chen Chuanqun 1 Zhong Weiliang 2 Wang Shouxiang 1 Zhang Yongxi 1 Sun Zhiming 1 1
        Issue 1, (1997)
        摘要：The transport,accumulation and distribution of 141 Ce in a simulated paddy were studied.The results show that when entering water, 141 Ce will be transferred to soil and rice,and the 141 Ce concentration in water will decrease rapidly.The 141 Ce concentration in rice is higher than that in soil and water.The dynamic change of the 141 Ce concentration in the water and soil are decreased monotonously with time,and that in rice is increased to a maximum value then decreased, 141 Ce is puickly adsorbed by soil and the adsorption rate is higher.More than 95% of 141 Ce is detainde in 4 cm of soil surface.The 141 Ce concentration in soil presents an individual exponential declining with depth of soil.  
        关键词：Rice;Radioactive cerium;Compartment model;Concectration factor   
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        发布时间：2021-04-09
      • He Weiyu
        Issue 1, (1997)
        摘要：A method is described for determination of 123 I activity with a radionuclide activity meter.In 123 I sample often exists 124 I as a radioactive impurity.The activity ratio of 124 I to 123 I is changed with time because the two nuclides have different half lifetime.Based on the measured value in the activity meter and the “activity ratio vs.time”relationship,the real 123 I activity can be read directly by adjusting the nuclide factor in the activity meter.The measuring error is less 5%.  
        关键词：I;Radioactive activity;Radionuclide activity meter   
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        发布时间：2021-04-09
      • Lu Wendong He Grangren
        Issue 1, (1997)
        摘要：The contents of Ca,Sr,Pb,Zn,Cu,Ni,Fe,Mn,Cr and Ti in hair of 32 cases with breast cancer and 105 cases with fibrocystic disease have been measrued by XRF.Comparde with 55 normal female adults, the hair levels of Sr,Zn,Cu,Mn and Ca in breast cancer putients and the hair levels of Sr,Mn and Ca in fibrocystic disease patients were significantly decreased （P<0.01 or P<0.001）. However, the hair contents of Zn, Ni ahd Cr in fibrocystic disease patients were dramntically increased（P<0.05）.  
        关键词：XRFanalysis;Hair;Trace elements;Breast cancer;Fibrocystic disease   
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        发布时间：2021-04-09
      • Zhang Jiahua
        Issue 1, (1997)
        摘要：It is pointed out that the group of derivde nuclides generated by the interaction of 238 U and reactor neutron flux actually forms a new type of unstable nuclide series,i.e.the fifth unstable nuclide series.The role of fission products played in the series is similar to the stable Pb isotope（or 209 Bi）,the last generation daughter nuclide in the radioactine decay series. So that fission products should be regarded as the generation of derived nuclide of the fifth unstabale nuclide series.Since in radioactive decay as well as its whole family of radioactive daughter nuclide of the fifth unstabale nuclide series.Sincein radioactive decay series the total quantity of atoms lost due to radioactive decay of the parent nuclide as well as its whole family of radioactive daughter nuclides transforms entirely to stable nuclide Pb,this means tuansformatiom ratio equals to unity .Thus the peculiar property of transformation ratio approaching unity in the fifth unstable nuclide seriex is understandable.As a full set of the fifth unstable nuclide series is very difficult to lbtain,idea on the quasi-fifth unstable nuclide series,which consists of only the upper generations of the derivde nuclides which are in equilibrium with their parent,is introduced.  
        关键词：Unstable nuclide series;Derived nuclides;Neutron flux;loss-fission transformation ratio   
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        发布时间：2021-04-09
      • Yu Xuefeng Ren Diyuan Lu Wu Zhang Guoqiang Guo Qi Yan Rongliang
        Issue 1, (1997)
        摘要：The mechanism and characteristics have been studied of leakage current of the 4000 series CMOS devices induced by the total ionizing radiation.The method of restraining the leakage,especially the leakage in the field oxide region,is discussed.  
        关键词：series CMOS devies;Ionizing radiation;Leakage current   
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        发布时间：2021-04-09
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