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首页> 外文期刊>Applied radiation and isotopes: including data, instrumentation and methods for use in agriculture, industry and medicine >Accuracy of ↑(210)Pb Dating in Two Annually Laminated Lake Sediments with High Cs Background
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Accuracy of ↑(210)Pb Dating in Two Annually Laminated Lake Sediments with High Cs Background

机译：具有高Cs背景的两个年叠层湖泊沉积物中↑（210）Pb的约会精度

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A low-background gamma ray spectroscopy system has been used for nondestructive determination of ↑(210)pb, ↑(226)Ra, ↑(134)Cs and ↑(137)Cs in lake sediment samples. Two Finnish sediment cores with high ↑(137)Cs activity originating from the Chernobyl accident have been analysed and dated using ↑(210)Pb. The accuracy of the ↑(210)Pb dating method was checked by varves counting of replicate samples. In one lake the ↑(210)pb method gave similar dating results as varves, but in the other lake significant differences were detected. It was found that a high Cs concentration significantly impairs the accuracy of the ↑(210)Pb activity measurement. However, the reliability of the dating result depends mostly on the constancy of the Pb flux into the sediment. Human activity has greatly increased the variability of ↑(210)Pb flux, reducing the reliability of ↑(210)Pb dating. Independent support by other methods is required to improve dating results. # 1997 Elsevier Science Ltd
机译：低背景伽玛射线光谱系统已用于湖泊沉积物样品中↑（210）pb，↑（226）Ra，↑（134）Cs和↑（137）Cs的无损测定。使用切尔诺贝（210）Pb对源自切尔诺贝利事故的两个具有高↑（137）Cs活性的芬兰沉积物核心进行了分析和测年。 ↑（210）Pb测年方法的准确性通过重复样品的varves计数来检查。在一个湖泊中，↑（210）pb方法给出的测年结果与valves相似，但在另一个湖泊中，检测到显着差异。发现高的Cs浓度会严重损害↑（210）Pb活性测量的准确性。但是，测年结果的可靠性主要取决于铅进入沉积物中的恒定性。人类活动大大增加了↑（210）Pb流量的变异性，降低了↑（210）Pb测年的可靠性。需要其他方法的独立支持以改善约会结果。 ＃1997爱思唯尔科学有限公司

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