Exploring sample size limits of AMS gas Ion Source 14C analysis at Cologneams
Exploring sample size limits of AMS gas Ion Source 14C analysis at Cologneams
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探索 Cologneams 的 AMS 气体离子源 14C 分析的样本量限制
DOI：
10.1017/rdc.2019.143
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发表时间：
2019
期刊：
影响因子：
8.3
通讯作者：
J. Rethemeyer
中科院分区：
文献类型：
--
作者：
Jan Olaf Melchert;Alexander Stolz;A. Dewald;M. Gierga;P. Wischhöfer;J. Rethemeyer
对小型放射性碳（14C）分析的需求日益增长，需要在我们的6 MV Tandetron AMS （HVE）上安装“SO-110 B”型离子源（HVE Europa B.V.），用于使用Ionplus AG的气体注入系统（GIS）或EuroVector EA 3000元素分析仪（EA）直接注入二氧化碳。我们用石英安瓿或EA容器中燃烧的多系列无14c和现代标准（2.5-50µg C）测试了这两种体系，并能够量化引入的外源C。在EA- gis - ams分析中，外源C主要来源于EA样品容器。50µg C在溶剂清洗锡（Sn）容器中燃烧的空白值为0.0127±0.0012 F14C（船）和0.0090±0.0010 F14C（胶囊），而在热清洗银（Ag）容器中燃烧的空白值要高得多。GIS-AMS对气体样品的处理得到类似的空白值，对应于0.30±0.08µg外源C和0.93±0.23 F14C，其中包括0.28µg现代C和0.02µg化石C。在单个石英管中分成等分燃烧大量的空白材料（1 mg C）得到较低的空白（0.0064±0.0008 F14C; 50µg C）。因此，现在可以在科隆ams对小型气体样品进行14C分析。
ABSTRACT Increasing demands for small-scale radiocarbon (14C) analyses required the installation of a “SO-110 B” type ion source (HVE Europa B.V.) at our 6 MV Tandetron AMS (HVE) dedicated for the direct injection of CO2 using either the gas injection system (GIS) from Ionplus AG or a EuroVector EA 3000 elemental analyzer (EA). We tested both systems with multiple series of 14C-free and modern standards (2.5–50 µg C) combusted in quartz ampoules or EA containers and were able to quantify exogenous C introduced. In EA-GIS-AMS analysis exogenous C is mainly derived from the EA sample containers. Blank values for 50 µg C combusted in solvent-cleaned tin (Sn) vessels were 0.0127 ± 0.0012 F14C (boats) and 0.0090 ± 0.0010 F14C (capsules), while they were much higher for thermally cleaned silver (Ag) capsules. The processing of gas samples for GIS-AMS yields similar blank values corresponding to 0.30 ± 0.08 µg exogenous C with 0.93 ± 0.23 F14C consisting of 0.28 µg C modern and 0.02 µg C fossil C. The combustion of larger amounts of blank material (1 mg C) in a single quartz tube split into aliquots gives lower blanks (0.0064 ± 0.0008 F14C; 50 µg C). Thus, 14C analysis of small, gaseous samples is now possible at CologneAMS.