The 16th International Conference on Accelerator Mass Spectrometry

Performance Assessment of Graphitization Process at AGE-3 for 14C-AMS Analysis in IHEG

PSA-57

21 Oct 2024, 17:15

20m

Lobby and Hallway , 2nd Floor (( Poster session A should be set up in the morning.))

Poster Sample Preparation Techniques Poster Session A

Speaker

佳眉 王 (中国地质科学院水文地质环境地质研究所)

Description

Abstract: To overcome the disadvantages of manual purification system during AMS-14C measurement, including inefficiency, unstable quality of graphite, and interference from modern carbon. CAGS-IHEG (Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences) introduced AGE-3 to improve the performance of small carbon graphite, leading to the rapid production of high-quality carbon samples. By changing the reaction temperature and H2/CO2 ratio, the optimum conditions for prompt graphitization reaction have been determined. Corrections for isotopic fractionation and increased modern C background are made by measuring samples in relation to standards of similar mass and a blank sample. In comparison to a manual purification system, AGE-3 results in improvements in parameter visualization and the precise synthesis of graphite. The enhanced technique for graphitization was specifically developed to achieve optimal beam currents of 14C in IHEG 1 MV AMS measurement, aiming to address issues related to inefficiency and impurities in the processing of soil and sediment samples.