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首页> 外文期刊>Nuclear instruments and methods in physics research >A fully automated system for the extraction of in situ cosmogenic carbon-14 in the Tulane University cosmogenic nuclide laboratory
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A fully automated system for the extraction of in situ cosmogenic carbon-14 in the Tulane University cosmogenic nuclide laboratory

机译：杜兰大学宇宙成因核素实验室中用于提取原位宇宙成因碳14的全自动系统

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摘要

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.
机译：2015年至2016年初，我们从L.L.C. Aeon Laboratories购买了新的碳提取和石墨化系统（CEGS）。 （以下称为“ Aeon”），并将其修改为用于原位宇宙成因样品处理。杜兰大学CEGS（TU-CEGS）是全自动的，从样品插入管式炉到生成石墨材料准备用于加速器质谱法阴极制备。该系统实现了样品处理功能的集成序列：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。提取部分来自通过偏硼酸锂（LiBO2）助熔剂进行的石英熔体演化设计。系统设计的关键分析与过程参数的分析相结合，使在我们实验室中处理的总样品数量（自安装以来为320）的样品通量提高了近一个数量级，而过程空白水平保持一致（0.98 +/- 0.32 x 10（5） ）原子C-14，n = 26）和二级标准值（0.4953 +/- 0.0012 Fm，n = 8）。在本文中，我们详细介绍了系统设计，处理算法和生产线性能，包括系统空白和CRONUS-A的结果（6.12 +/- 0.32 x 10（5）原子g（-1）C-14，n = 13）实验室间比较材料。

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