最新刊期
      卷 0 ， 期 0 ， 2020
      • Fan Long Ren Diyuan Gao Wenyu Guo Qi Yan Rongliang
        Issue 3, (1997)
        摘要：An investigation on temperature effect of the home-made pMOS RADFETs used in dosimeters has been carried out. Based on the theoretical formulas of MOS transistor threshold voltage and the I DS - V GS equation, the temperature effects on threshold voltage and channel carrier mobility are discussed. And the influence of irradiation on the “zero temperature coefficient（ZTC） point” is explored. The experimental results show that biasing a pMOS dosimeter at ZTC point （constant current） to measure the gate-source voltage can improve the read-out precision of the dosimeter and make compensation for the temperature effect.  
        关键词：pMOS dosimeter;Temperature effect;Zero temperature coefficient（ZTC）point;Compensation   
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        发布时间：2021-04-09
      • Zhu Xuping Yang Ruiying
        Issue 3, (1997)
        摘要：The neutron activation analysis of As（Ⅲ） and As（Ⅴ） contents in water samples is described. A separation method of inorganic arsenic As（Ⅲ） and As（Ⅴ） in water is studied using 76 As as an indicator. The APDC-CCl 4 extraction system is used in the separation of As（Ⅲ） and As（Ⅴ）, and inorganic arsenic in water samples is then coprecipitated by Fe（OH） 3. After filtering and parching the collected sediment can be analyzed by NAA directly.  
        关键词：Arsenic;Extraction;Coprecipitation;Neutron activation analysis（NAA）   
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        发布时间：2021-04-09
      • Zhang Baifang Dai Guangxi Zhou Zhiming
        Issue 3, (1997)
        摘要：The structure and performance of a three-dimension movable target holder used in nuclear reaction experiments are described. A target supporter including six target positions is mounted on the top of a conveyer, the movement of which is controlled by a digital eletrical console. The vertical and horizontal displacements of the supporter as well as its rotation round the beam axis can be realized, with a translation error of less than 0.3mm and a rotation error of less than 0.2°, respectively. A wanted target can be easily chosen by vertically moving the supporter and the dead detection zone can be avoided by appropriately turning the supporter.  
        关键词：Target holder;Nuclear reaction experiments;Judgment unit;Dead detection zone;Repeat error   
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        发布时间：2021-04-09
      • Wang Zhaorong 1,2 Hu Xiuzhang 1 Zhou Dechang 1,2 Ge Ningjie 1,2 1
        Issue 3, (1997)
        摘要：The ESR dating of two clam fossil samples from the upper of Nihewan beds is described. The estimated age is 1.36 and 1.22Ma respectively. Bone and clam fossils bound in lower Nihewan beds were dated by amino acid methods, to be 2.7, 2.9 and 2.78Ma respectively. Based on these data, ages of the Quaternary standard strata in Nihewan beds of Hebei Province can be determined.  
        关键词：ESR dating;Nihewan beds;Fossil;Amino acid dating   
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        发布时间：2021-04-09
      • Hou Xiaolin Chai Zhifang Qian Qinfang Li Chunsheng
        Issue 3, (1997)
        摘要：The epithermal neutron activation analysis （ENAA） using BN and BN+Cd as thermal neutron shielding materials was used to determine the contents of iodine in 20 Chinese biological standard reference materials （SRMs）. The analytical precision, expressed by the relative standard deviation, is 2%-6% and 8%-12% for solid samples with iodine level of more than 100ng/g and 20-100ng/g, respectively, and 12%-18% for liquid samples with iodine level of less than 100ng/g. The detection limits of iodine in our experimental condition vary between 10-30ng/g, 55-95ng/g and 25-68ng/g for BN-shielding in inner irradiation site, Cd-shielding and BN+Cd shielding in outer irradiation site, respectively. Furthermore, four international biological SRMs were determined, and the experimental results agreed well with the certified or literature values.  
        关键词：Iodine;Epithermal neutron activation analysis;Biological standard reference materials   
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        发布时间：2021-04-09
      • Issue 3, (1997)
        摘要：将最新的基于Ｌａｐｌａｃｅ变换的大型正电子寿命无约束解谱程序ＣＯＮＴＩＮ（ＰＡＬＳ２），在保持运算精度和运算速度的条件下，成功地移植于个人微机。移植后的程序能在微机保护模式下运行，突破了ＤＯＳ６４０Ｋ内存的限制。经正电子湮没实验中常用标准样Ａｌ及典型高分子材料聚四氟乙烯寿命谱拟合验证，结果准确可靠。同时，应用移植程序对高分子液晶丙烯酸酯共聚物常温下的正电子湮没寿命谱进行解析，通过正电子湮没率分布计算得到了材料内部自由体积尺寸半径的连续分布  
        关键词：正电子湮没;数据处理;Laplace变换   
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        发布时间：2021-04-09
      • Liu Shengkang Xu Jin Cheng Delong Zhang Yongjie
        Issue 3, (1997)
        摘要：The theoretical calculation and experimental study on the measurement of boron （B 2O 3） content in dry glass fibre by using the thermal neutron trasmission method is reported. For the samples with a boron content of 2%-14% and a mass of 14-25g, a linear law of ln（1/T） against m has been found where T and m are transmission coefficient of slow neutrons and B 2O 3 content respectively. The linear correlation coefficient is 0.999 and precision of the boron content measurement is better than 0.5%.  
        关键词：Thermal neutron transmission method;Glass fibre;Boron content   
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        发布时间：2021-04-09
      • He Chengfa Ba Weizhen Wu Qinzhi Chen Chaoyang
        Issue 3, (1997)
        摘要：A multiple-cavity parallel plane ionizing chamber of gold is designed for measuring dose profiles for 60 Co gamma rays in gold near interfaces with lower atomic number materials by means of a two-step measuring route.  
        关键词：Radiation dosimetry;Dose enhancement effect   
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        发布时间：2021-04-09
      • Chen Youhong Zhu Jieqing
        Issue 3, (1997)
        摘要：The scanning proton microprobe and micro-PIXE quantitative analysis technique have been used to determine composition and distribution of the trace elements in micron areas of dinosaur eggshell fossils from the stratum of Upper Cretaceous system at Nanxiong Basin in Guangdong Province, China. The study shows that the trace elements mainly include Ti, V, Cr, Mn, Co, Ni, Cu, Zn, As, Rb, Sr, Y, Zr, Sb, Ba and Pb in the micron area, but they present different distributions. While the element Sr is mainly enriched in the near surface layer, others mainly reside in the near inner layer. A preliminary discussion on the reason of the dinosaur extinction is given based on the above study.  
        关键词：Dinosaur eggshell fossil;Proton microprobe;Trace element composition and distribution;Dinosaur extinction   
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        发布时间：2021-04-09
      • Jiang Shan Jiang Songsheng He Ming Ma Tiejun Guo Hong Du Shubin Yuan Jian Wu Shaoyong
        Issue 3, (1997)
        摘要：The particle identification techniques used in the accelerator mass spectrometry （AMS） system based on the HI-13 tandem accelerator at China Institute of Atomic Energy have been introduced. With this system, 10 Be, 26 Al, 36 Cl and 129 I in natural sampls were measured with a sensitivity of 10 -13 —10 -15 （istope ratio） and a detection limit of 10 5—10 7 atoms.  
        关键词：Accelerator mass spectrometry;Particle identification;Isobars   
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        发布时间：2021-04-09
      • Tang Fanghua
        Issue 3, (1997)
        摘要：The sorption and migration of 137 Cs in two kinds of clay materials have been studied and the feasibility of clay as filling materials is discussed. The sorption ratio and equilibrium time for the two clay materials were measured with the intermittence method and the effects of clay grain size, materials property and water phase pH value on the sorption ratio was studied. And the sorption isothermal line was found to be a straight line. The results show that the two kinds of clay as filling materials of waste disposal can, to a certain extent, hinder the migration of 137 Cs.  
        关键词：Nuclide migration;Sorption material;137 Cs;Sorption ratio   
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        发布时间：2021-04-09
      • Wang Xiaoyan Zhang Tonghe Liang Hong
        Issue 3, (1997)
        摘要：The surface layer optimized in resistance of corrosion and wear has been obtained by W+C dual implantation on H13 steel. The electrochemical polarization measurements show that the peak current density ID is increased and then saturated with increasing of voltage scanning loops. The ID is 100 times smaller than that of H13 steel, and 2-3 times smaller than that of tungsten. The influence of dual implantation order on corrosion resistance is also studied. The ID for W 5C 8 implanted first with W is half of that for C 5W 5 implanted first with C. The corrosion resistance structure of the samples after corrosion is observed by SEM. The X-ray analysis indicates that the structure consists of disperse phases of WC, W2 C FeW, Fe 2W, FeW 2C and iron carbides. It is shown from Auger analysis that the optimum complex layer for corrosion resistance consists of thin carbon film on surface, disperse phases of these metal compounds in middle and then iron carbides layer below.  
        关键词：H13 steel;W+C dual implantation;Corrosion resistance   
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        发布时间：2021-04-09
      • Wu Yingrong Pan Juxiang Li Guangcheng Zhao Limin Huang Yuying
        Issue 3, (1997)
        摘要：The SR-TXRF experimental equipment and the method of studying the cell elemental spectroscopy are described. The MDLs for several elements in two standard reference materials and the elemental contents of each cell are given.  
        关键词：Synchrotron radiation;Total reflection;X-ray fluorescence analysis;Trace elements analysis;Cell   
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        发布时间：2021-04-09
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