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引用次数: 0
摘要
NTUAMS 实验室设计并建造了一个与元素分析仪(EA)相连的低成本计算机控制石墨化系统。这套半自动系统配备了 6 个反应器,用于在铁催化剂上将 CO2 与 H2 石墨化。整个过程大约需要 7 个小时,包括铁调节、样品燃烧和装载以及石墨化。该系统能为含碳量为 0.5-1.6 毫克的样品生产优质石墨,石墨化的压力产率为 57.7% 至 87.1%。OXI 和 OXII 的平均值与共识值吻合,但 ANU 蔗糖的结果略高于报告值。十个月的无烟煤本底样品的平均值为 0.38±0.10 pMC(n=21),对应的 14C 年龄为 45 kyr BP。FIRI 的互比样品 L 和 M 表明,测得的 14C 年龄与共识值几乎相同,而且这些值的差值较小。该系统对泥炭样本的总有机碳(TOC)进行了石墨化处理,为 AMS 14C 测年提供了更高效、更便捷的方法。
A HOMEMADE SEMIAUTOMATIC GRAPHITIZATION DEVICE FOR AMS 14C DATING AT NTUAMS LAB
A low-cost and computer-controlled graphitization system connected to an elemental analyzer (EA) has been designed and built at the NTUAMS Lab. This semiautomatic system equips 6-unit reactors for the graphitization of CO2 with H2 on the iron catalyst. The entire procedure takes about 7 hours for iron conditioning, sample combustion and loading, and graphitization. The system can produce good-quality graphite for samples containing 0.5–1.6 mg carbon mass, with the pressure yield of graphitization ranging from 57.7% to 87.1%. The average values of OXI and OXII agree well with the consensus value, but the result of ANU sucrose was observed to be slightly higher than the reported one. The background samples of anthracite over ten months yielded an average of 0.38±0.10 pMC (n=21) corresponding to a 14C age of 45 kyr BP. Intercomparison samples L and M of FIRI exhibit that the measured 14C ages are almost identical to the consensus values and have a small spread in these values. The system has been carrying out graphitization for total organic carbon (TOC) of peat samples, and providing a more efficient and convenient way for AMS 14C dating.
期刊介绍:
Radiocarbon serves as the leading international journal for technical and interpretive articles, date lists, and advancements in 14C and other radioisotopes relevant to archaeological, geophysical, oceanographic, and related dating methods. Established in 1959, it has published numerous seminal works and hosts the triennial International Radiocarbon Conference proceedings. The journal also features occasional special issues. Submissions encompass regular articles such as research reports, technical descriptions, and date lists, along with comments, letters to the editor, book reviews, and laboratory lists.