| α反冲径迹定年 |
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| 关键词:alpha-recoil track thermochronology dating biotite phlogopite |
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| Alpha-Recoil Track Dating |
| 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. |
| DONG Jinquan,YUAN Wanming,GAO Shaokai,BAO Zengkuan,WANG Shicheng.2005.Alpha-Recoil Track Dating[J].Acta Geoscientica Sinica,26(z1):258-261. |
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