共查询到19条相似文献,搜索用时 165 毫秒
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加速器质谱是近年来蓬勃发展的一种十分活跃的核分析技术,其应用涉及环境科学、地质学、核物理及天体物理、生物医学等多个领域。中国原子能科学研究院的加速器质谱装置自从1989年建立至今,已经对^36Cl,^10Be,^129I,^26Al,^79Se和^41Ca等多种核素进行了成功测量。介绍了中国原子能科学研究院的加速器质谱计系统、核素的测量原理及几种相关核素的成功应用。The Accelerator Mass Spectrometry facility at the China Institute of Atomic Energy was established in 1989. The measurement methods for interesting nuclides such as ^36Cl, ^10Be, ^129I, ^26Al, ^79Se and ^41Ca etc. have been established and studies on their applications have been carried out. The facility and some interesting applications are briefly introduced. 相似文献
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新兴的加速器质谱技术(AMS),开拓了核技术应用的新领域。本文简述了加速器质谱技术的主要优点和发展过程,着重介绍了加速器质谱技术在核物理中的应用,其中包括:长寿命同位素半衰期的测量;核反应截面的测量;寻找奇异粒子和测量太阳中微子等实验及应用。 相似文献
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AMS测量中同量异位素的鉴别方法 总被引:2,自引:0,他引:2
在加速器质谱测量中,存在同位素和同量异位素的干扰.排除同位素的干扰是开展超微量核素分析的重要课题之一.主要介绍了加速器质谱测量中同量异位素的几种鉴别、排除方法,以及这些方法的原理、发展及应用. There are interference of isotopes and isobars in accelerator mass spectrometry (AMS) measurements. Eliminating the isobaric interference is the important aspect in AMS measurements. Several methods of isobaric identification in AMS measurements are discussed in this paper. Principles, developments and applications of these methods are also introduced. 相似文献
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Hf的加速器质谱分析要求必须提供纯度极高的HfF4样品,以便获得足够多的HfF5^-离子流来进行测量。氧同位素等杂质会导致产生HfF3O^-,HfFO2^-等无测量价值的离子流,造成HfF5^-束流强度降低,使测量能力下降。“干法”制备技术有助于获得纯度高、无氧和水等杂质的HfF4样品,从而改善加速器质谱的测量效果。 相似文献
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第三次国际加速器质谱计会议于1984年4月10—13日在瑞士苏黎士召开.来自约20个国家的150多人参加了会议.提交的文章有90多篇,其中涉及14C测定的有20多篇,10Be的18篇,27Al的四篇,36Cl 的四篇,3H的两篇,关于40Ca,60Fe,98TC,129I,188Os,194Pt和205Pb 等的测定和半导体材料中不纯成分的分析的文章有十多篇.这些微量同位素的测定广泛应用于地质学、海洋学、考古学、水文学、天体物理、宇宙线物理、陨石物理、核物理和气象研究等领域. 从所用加速器的情况看,西德慕尼黑技术大学的MP串列加速器注入的重离子后加速器具有较高的能量,它能将被分… 相似文献
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236U是一种长寿命放射性核素, 其半衰期为T1/2=2.342(3)×107 a, 在自然界的含量极微, 天然铀中 236U/238U的原子比约为~10-14。 目前, 对于236U及其测量的研究报道较少。首先介绍了236U的产生, 并对地球中 236U的总量进行了估算。 概述了236U测定在亿年级中子注量率积分评估、 核环境和核活动监测, 以及地质学等领域中的重要应用。 最后,对国内外加速器质谱(AMS)测量236U的状况进行了综述,报道了中国原子能科学研究院AMS小组通过对同位素干扰鉴别的多方面研究, 初步建立了236UAMS测量方法。 236U is a longlived radionuclide with half life of 2.342(3)×107 a. The ratio of 236U/238U is about 10-14 in the natural Uranium. The origin and production of 236U in globe are introduced and estimated in this paper,respectively. The major applicationsion of 236U as a 100 million year neutron flux integrator,as a “fingerprint” for monitoring nuclear environment and nuclear activity,and as a tracer in geological studies are briefly summarized. The accelerator mass spectrometry(AMS) measurement of 236U in the world and the research on HI 13 tandem accelerator at China Institute of Atomic Energy(CIAE) is also mentioned in this paper. 相似文献
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WANG Xiang-Gao HE Ming SHI Guo-Zhu LI Chao-Li WANG Wei ZHANG Da-Wei HUANG Chun-Tang SHEN Hong-Tao WU Shao-Lei HE Guo-Zhu WU Shao-Yong JIANG Shan 《中国物理C(英文版)》2010,34(2)
The rare isotope 236U has a half-life of 2.342(3)×107 years,and is produced principally by thermal neutron capture on 235U.The isotopic atom ratio of 236U/238U depends on the integral thermal neutron flux received by the material of interest.236U is potentially useful as a "fingerprint" for indicating the presence of neutron-irradiated uranium usually originating from nuclear activity.By extracting negative molecular ion UO- from the uranium oxide target,simulating the 236U16O- beam transport with 238U16O- and 208Pb12 6O- pilot molecular ion beam,transporting the 236U-containing ion beam with a high resolution injection magnet analyzer and electrostatic analyzer system,and finally identifying and detecting 236U with a time-of-flight detector(TOF),a method for AMS(Accelerator Mass Spectrometry) measurement of 236U was established on the HI-13 Accelerator AMS system at China Institute of Atomic Energy. 相似文献
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SHEN Hong-Tao IANG Shan HE Ming DONG Ke-Jun LI Chao-Li WANG Xiang-Gao HE Guo-Zhu GONG Jie LU Li-Yan LI Shi-Zhuo ZHANG Da-Wei SHI Guo-Zhu HUANG Chun-Tang WU Snao-Lei WU Guo-Zhu 《中国物理C(英文版)》2010,34(1)
By using HPGe γ-ray spectrometry, the activity of the long-lived fission product 126Sn in a SnOB2 sample was measured. The number of 126Sn atoms and the ratio of 126Sn to Sn were calculated based on the half-life value of 2.35×105a and the chemical stoichiometry. The result of the ratio of 126Sn to Sn, (1.033±0.037)×10-8, is consistent with the results measured by the accelerator mass spectrometry (AMS) within uncertainty limits, which confirms our procedures in the measurement of 126Sn by AMS and lays a foundation for the AMS measurement of 126Sn at much lower levels. 相似文献
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大气宇宙成因核素 10Be、 7Be、 22Na作为平流层、对流层之间物质交换(STE)动力学过程的敏感示踪剂,对于全球气候变化、大气环境治理等研究具有非常重要的意义。介绍了这几种核素应用于STE的国际研究现状以及面临的困难,概述了加速器质谱法(AMS)在此方面具备的优势和研究基础,基于天津大学的小型低能量AMS系统和已建立的 10Be测量方法,对AMS测量 7Be、 22Na所面临的关键技术做了可行性分析与探索。 相似文献
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Al是核天体物理非常重要的一个核素,14N(16O,α)26Al的反应截面可能是天体26Al的一个来源.介绍了利用AMS方法测量14N(16O,α)26Al反应截面的过程,包括靶的照射、化学分离、26Al原子数的AMS方法测量及最后的核反应截面值.The~(26)Al is one of the important nuclide in the astrophysics. The reaction, namely~(14)N(~(16)O, α)~(26)Al, may be one of the origin of the source of~(26)Al in the cosmic. The procedures of the cross section measurement with accelerator mass spectrometry (AMS) method are discussed, In this paper, the irradiation experiment, chemical separation and~(26)Al measurement are described. The results of cross-section (around) sub-barrier energies are also represented. 相似文献
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加速器质谱(AMS)是测量长寿命放射性核素灵敏度最高的分析技术,在环境、地质、考古、物理等领域有着广泛应用。近年来,AMS装置的小型化在国际上得到了很大发展。为了研发小型化AMS装置及其分析技术,中国原子能科学研究院分别自主研制了加速电压为0.2 MV的单极型AMS装置和端电压为0.3 MV的串列型AMS装置。基于研制的单极型AMS装置,成功开展了14C的高效传输和本底排除技术研究,实现了14C的高灵敏测定,14C/12C的测量灵敏度达到2×10–15;利用研制的串列型AMS装置,开展了低能量下129I的气体剥离条件、本底排除和探测方法研究,建立了129I的高效传输和高灵敏测量方法,129I/127I的测量灵敏度为1×10–14。这是国内首次研制成功小型AMS装置,为AMS国产化奠定基础。 相似文献
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加速器质谱方法测量41Ca及其在生物医学中的应用 总被引:6,自引:2,他引:4
介绍了用AMS测量41Ca的方法及其在生物医学中的应用,以及中国原子能科学研究院目前开展4 1Ca的AMS测量及其应用研究的情况.Ca(T 1/2 =1.0×10 5 a) as a tracer, confined with Accelerator Mass Spectrometry (AMS) method and its applications are reviewed. Measurement of 41 Ca with HI-13 tandem AMS system at the China Institute of Atomic Energy is also introduced. The measurement of 41 Ca used for studying mechanism of cancer caused by carcinogenic substances and mechanism of Ca supplement in human body diseases are being developed in collaboration with Department of Occupational Health, Beijing Universit... 相似文献