ASSESSMENT OF INTERLABORATORY PRETREATMENT PROTOCOLS BY RADIOCARBON DATING AN ELK BONE FOUND BELOW LAACHER SEE TEPHRA AT MIESENHEIM IV (RHINELAND, GERMANY)
ASSESSMENT OF INTERLABORATORY PRETREATMENT PROTOCOLS BY RADIOCARBON DATING AN ELK BONE FOUND BELOW LAACHER SEE TEPHRA AT MIESENHEIM IV (RHINELAND, GERMANY)
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DOI：
10.1017/s0033822200048372
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发表时间：
2013-01-01
期刊：
影响因子：
8.3
通讯作者：
Nalawade-Chavan, Shweta
中科院分区：
文献类型：
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作者：
Fiedel, Stuart J.;Southon, John R.;Nalawade-Chavan, Shweta
四个加速器质谱 (AMS) 设施进行了一项实验室间试验，旨在通过对来自 Miesenheim IV 的麋鹿 (Alces alces) 样本进行年代测定来检查骨放射性碳测定的可靠性和再现性。该标本取自 Laacher See 火山灰直接下方的安全地质环境，该地质环境提供了类似于距今 11,060 年（类似于距今 13,050 年）的精确的前终点。遗憾的是，由于骨样本明显受到外源有机物质的污染，比对结果变得复杂。这种污染物（可能是腐殖酸）导致了广泛的年龄跨度（10,010 +/- 30 至 11,100 +/- 45 BP）。唯一能够进行准确测定且与火山灰年龄一致的方法是牛津大学的单一氨基酸技术，该技术针对羟脯氨酸。酸水解步骤似乎对于破坏骨胶原和污染物之间的键至关重要。
Four accelerator mass spectrometry (AMS) facilities undertook an interlaboratory exercise designed to examine the reliability and reproducibility of radiocarbon determinations on bone by dating a sample of elk (Alces alces) from Miesenheim IV. This specimen is derived from a secure geological context directly beneath the Laacher See tephra, which provides a precise terminus ante quem of similar to 11,060 yr BP (similar to 13,050 cal yr BP). Regrettably, the results of the intercomparison exercise were complicated by evident contamination of the bone sample by exogenous organic material. This contaminant, probably humic acid, resulted in a wide span of ages (10,010 +/- 30 to 11,100 +/- 45 BP). The only method that yielded an accurate determination, consistent with the age of the tephra, was Oxford's single amino acid technique, which targets hydroxyproline. An acid hydrolysis step seems to have been crucial in breaking the bonds between the bone collagen and the contaminant.