Conveners
Small C-14 Sample Techniques and Applications
- Xiaomei Xu (University of California, Irvine)
Description
Discussions will focus on milligram to microgram C fractions of natural and anthropogenic biomarkers, compound specific samples and aerosol fractions. Improvements on analytical separations to better isolate C fractions for subsequent AMS analyses, accuracy and precision validation (including blank assessment and background corrections) and/or applications of smaller targets in a wide variety of research areas are welcome.
In the CRC1211 project "Evolution at the Dry Limit", precise dating analysis of soil samples from the Atacama Desert is essential. These soil samples result in ultra small CO$_2$ samples and have a carbon content of 2-20μg. At CologneAMS ultra-small samples are measured as CO$_2$ with, an elemental analyzer (EA), an isotope ratio mass spectrometer (IRMS) and the 6MV AMS system, by the use of a...
The μGRAPHILINE, introduced in 2024, offers a new, fully automatic graphitization process, enabling rapid, reliable, and precise graphitization using the zinc reduction method for radiocarbon dating. While the majority of radiocarbon samples include bone, wood, charcoal, plant remains, carbonates, and sediments (Dee et al. 2020), there are niche areas of other samples that can be dated with...
Radiocarbon (14C) composition of dissolved organic carbon (DOC) provides critical constraints on its sources, transformation and cycles. UV-irradiation is considered as an effective approach to oxidize the fresh/salty DOC to CO2 of samples with typical low concentration for high precision radiocarbon measurements. However, the challenge of this method is the complete oxidation of sufficient...
Advancements in high-precision AMS radiocarbon ($^{14}$C) measurements coupled with sophisticated statistical techniques offer a powerful approach to uncovering and utilizing annual features in the $^{14}$C record. In recent years, signatures of rapid increases in cosmogenic $^{14}$C have been successfully used as tools for achieving exact-year dating, with the aid of Classical statistical...
