| α反冲径迹定年 |
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| 引用本文： | 董金泉,袁万明,高绍凯,保增宽,王世成. α反冲径迹定年[J]. 地球学报, 2005, 26(Z1): 258-261 |
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| 作者姓名： | 董金泉 袁万明 高绍凯 保增宽 王世成 |
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| 作者单位： | 中国科学院高能物理研究所核分析重点实验室，北京，100039;中国科学院高能物理研究所核分析重点实验室，北京，100039;中国科学院高能物理研究所核分析重点实验室，北京，100039;中国科学院高能物理研究所核分析重点实验室，北京，100039;中国科学院高能物理研究所核分析重点实验室，北京，100039 |
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| 基金项目： | 国家自然科学基金，国家重点基础研究发展计划(973计划)，国家科技攻关项目 |
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| 摘 要： | 与裂变迹径定年类似，α反冲径迹定年（Alpha-Recoil Track）也是基于天然放射性元素所释放核粒子在固体中产生可蚀刻径迹的积累。铀钍及它们的子体核素进行α衰变时形成α反冲径迹，当发射一个α粒子时，重的剩余核反冲并造成30-40nm的辐射损失痕迹，经过蚀刻α反冲径迹可在干涉相差显微镜下观测。如果在样品形成以后全部迹径被保留下来，那么测定它们的总数就可以得到样品的年龄。Α反冲径迹定年是一种刚刚开始研究的新型热年代学核分析技术，研究样品可以是单个小云母片（约0.5mm），定年范围102-106a，该方法对第四纪地质、地理、灾害及考古等领域有很大的应用潜力。
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| 关 键 词： | α反冲径迹 热年代学 定年 黑云母 金云母 |
Alpha-Recoil Track Dating |
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| DONG Jinquan,YUAN Wanming,GAO Shaokai,BAO Zengkuan and WANG Shicheng. Alpha-Recoil Track Dating[J]. Acta Geoscientica Sinica, 2005, 26(Z1): 258-261 |
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| Authors: | DONG Jinquan YUAN Wanming GAO Shaokai BAO Zengkuan WANG Shicheng |
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| Affiliation: | Department of Nuclear Analysis, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing,100039;Department of Nuclear Analysis, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing,100039;Department of Nuclear Analysis, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing,100039;Department of Nuclear Analysis, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing,100039;Department of Nuclear Analysis, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing,100039 |
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| Abstract: | Like fission-track dating, alpha-recoil track (ART) dating is based on the accumulation of unclear particles which are re-leased by natural radioectivity and produce etchable tracks in solids. ATRs are formed during the alpha-decay of uranium and thorium as well as their daughter nuclei. When emitting an alpha-particle, the heavy remaining nucleus recoils 30-40nm, leaving behind a trail of radiation damage. Through etching, the ATR tracks become visible under the interference pase-contrast microscope.Under the presupposition that all tracks are preserved since the formation of a sample, their total unmber should be a measure of the sample's age. The technique is applicable to tiny (0.5mm) single mica flakes in the age-range of 102-106 years. Alpha-recoil dating has a great application potential in such fields as geolgoy, geography and disaster of Quatemary and archeaeolgoy. |
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| Keywords: | alpha-recoil track thermochronology dating biotite phlogopite |
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