How to cut a sediment core for 210Pb geochronology |
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| Authors: | Xueqiang Lu Eiji Matsumoto |
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| Institution: | (1) Graduate School of Environmental Studies, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8601, Japan |
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| Abstract: | 210Pb geochronology is described mathematically, but how to cut a sediment core is not explicit. Thick sectioning may reduce dating reliability; but on the contrary, thin sectioning is time-consuming. Considering the counting error of excess 210Pb, a new method was proposed for the determination of meaningful thickness for sectioning. The authors applied this method to a core from Tokyo Bay. To increase the thickness with depth, the treatment is helpful in reducing the sample number for measurement and improving the dating accuracy. In addition, the averaging effect involved in sectioning was discussed, and it was confirmed that the averaging effect in the new method on 210Pb geochronology may generally be neglected. |
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| Keywords: | Sectioning thickness 210Pb geochronology Counting error |
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