Advances in Handling Small Radiocarbon Samples at the Laboratoire de Mesure du Carbone 14 in Saclay, France
Advances in Handling Small Radiocarbon Samples at the Laboratoire de Mesure du Carbone 14 in Saclay, France
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法国萨克雷 Laboratoire de Mesure du Carbone 14 处理小型放射性碳样品的进展
DOI：
10.1017/s0033822200057805
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发表时间：
2013
期刊：
影响因子：
8.3
通讯作者：
J. Vincent
中科院分区：
文献类型：
--
作者：
E. Delqué;I. Caffy;C. Comby;J. Dumoulin;S. Hain;M. Massault;C. Moreau;A. Quiles;V. Setti;C. Souprayen;J. Tannau;B. Thellier;J. Vincent
Artemis 加速器质谱 (AMS) 设施于 2003 年安装在法国萨克雷，专门用于放射性碳测量。样品由第四纪地质学、环境科学和考古学领域的科学家提交。整个制备过程最初针对碳含量约为 1 毫克的样品进行了优化，近年来已针对碳含量较低的样品进行了测试。特别是，我们制备并测量了质量范围为 0.01 至 1 mg C 的碳酸盐和有机背景和参考样品。这些测试有助于定义我们协议的实际限制并确定必要的改进。此外，我们的实验表明，碳含量低至 0.2 mg 的样品可以获得令人满意的石墨化产率（80% 或更高）和低背景值。为了处理较小的样品，我们开发了一个特定的流程。我们测试了较小的反应器（体积为 5 mL）并相应地调整了还原参数（氢气压力和温度）。我们还测试了化学除水器对石墨化产率和 14C 结果的影响。本文详细介绍了上述进展，并报告了使用改进的反应器制备的背景和标准小样品获得的 14C 结果。
The Artemis accelerator mass spectrometry (AMS) facility, installed in 2003 in Saclay, France, is devoted to radiocarbon measurements. Samples are submitted by scientists in the fields of Quaternary geology, environmental sciences, and archaeology. The entire preparation process, originally optimized for samples with about 1 mg of carbon, has been tested in recent years for samples with a lower carbon content. In particular, we prepared and measured carbonate and organic background and reference samples ranging in mass from 0.01 to 1 mg C. These tests helped define our protocol's practical limits and determine necessary improvements. Furthermore, our experiments demonstrated that satisfactory graphitization yields (80% and higher) and low background values can be obtained with samples down to 0.2 mg of carbon. For handling smaller samples, we developed a specific process. We tested smaller reactors (5 mL in volume) and adapted the reduction parameters (H2 pressure and temperature) accordingly. We also tested the effect of a chemical water trap on graphitization yields and 14C results. This paper presents in detail the aforementioned developments and reports the 14C results obtained for background and standard small samples prepared with the modified reactors.