原地宇宙成因¹⁴C分析技术的发展与应用

Compared to long-lived in situ cosmogenic nuclides like ¹⁰Be and ²⁶Al, the short half-life of ¹⁴C minimizes the influence of nuclide inheritance effects on exposure age. Its sensitivity to changes in surface processes over short time scales makes it an ideal tool for studying landscape changes over the past 25000 years. However, in situ ¹⁴C extraction is challenging due to the low ¹⁴C concentrations in terrestrial rocks and the contamination by atmospheric ¹⁴C, which has long hampered the development of in situ ¹⁴C analysis and its applications. Currently, there are only a few operational in situ ¹⁴C extraction systems worldwide, some of which have achieved low blank levels ((1~3)×10^{4 14}C atoms) and automation. The routine analysis and widespread application of in situ ¹⁴C rely on further methodological advances, including reducing the blank levels, improving analytical reproducibility, and determining more accurate production rates. Cosmogenic nuclides such as ¹⁰Be and ²⁶Al are widely used in China for studies in Earth surface sciences. However, research related to in situ ¹⁴C remains limited. Therefore, there is an urgent need to establish and develop in situ 14C analysis techniques. Following the high-temperature method, we are constructing an in situ ¹⁴C extraction and purification system at Xi'an AMS Center. It is expected to conduct to enrich research methods for landscape evolution in China.