A fully automated system for the extraction of in situ cosmogenic carbon-14 in the Tulane University cosmogenic nuclide laboratory
A fully automated system for the extraction of in situ cosmogenic carbon-14 in the Tulane University cosmogenic nuclide laboratory
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DOI：
10.1016/j.nimb.2019.02.006
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发表时间：
2019-09-15
影响因子：
1.3
通讯作者：
Nichols, Keir
中科院分区：
文献类型：
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作者：
Goehring, Brent M.;Wilson, Jim;Nichols, Keir
2015年至2016年初，我们从Aeon Laboratories，L.L.C.收购了一套新的碳提取和石墨化系统（CEGS）。（下文称为“永旺”），并将其用于原位宇宙成因样品处理。杜兰大学的CEGS（TU-CEGS）是完全自动化的，从样品插入管式炉到石墨材料的生成，为加速器质谱阴极制备做好准备。该系统实现了一系列完整的样品处理功能：提取/收集、纯化、测量和石墨生产，所有这些功能都集成到一个统一的系统中。提取部分来自于经由偏硼酸锂（LiBO 2）熔剂的石英熔融的不断发展的设计。系统设计的关键分析与工艺参数的分析相结合，使我们实验室处理的样品总量几乎增加了一个数量级（自安装以来320个），具有一致的工艺空白水平（0.98 +/- 0.32 x 10（5）个原子C-14，n = 26）和二级标准值（0.4953 +/- 0.0012 Fm，n = 8）。本文详细介绍了系统设计、工艺算法和生产线性能，包括系统空白和来自CRONUS-A（6.12 +/- 0.32 x 10（5）原子g（-1）C-14，n = 13）实验室间比较材料的结果。
During 2015 and culminating in early 2016, we acquired a new Carbon Extraction and Graphitization System (CEGS) from Aeon Laboratories, L.L.C. (hereafter, "Aeon"), and adapted it for in situ cosmogenic sample processing. The Tulane University CEGS (TU-CEGS) is fully automated starting from sample insertion into the tube furnace to generation of graphite material ready for accelerator mass spectrometry cathode preparation. The system implements an integrated sequence of sample processing functions: extraction/collection, purification, measurement, and graphite production, which are all integrated into one unified system. The extraction portion is derived from evolving designs of fusions of quartz via lithium metaborate (LiBO2) flux. A critical analysis of system design in concert with analysis of process parameters yield a nearly order of magnitude increase in sample throughput with total samples processed in our laboratory (320 since installation) with consistent process blank levels (0.98 +/- 0.32 x 10(5) atoms C-14, n = 26) and secondary standard values (0.4953 +/- 0.0012 Fm, n = 8). In this paper we detail system design, process algorithm, and line performance including system blanks and the results from the CRONUS-A (6.12 +/- 0.32 x 10(5) atoms g(-1) C-14, n = 13) interlaboratory comparison material.