We present the current performance of the in situ radiocarbon (14C) extraction line at the University of Bern with an improved extraction and combustion system. After three major steps of improvement, the extraction of sample CO2 gas now takes place inside a platinum crucible, supported by an outer quartz-glass crucible. This setup allows us to operate the line as a closed system for several samples without breaking the vacuum. Measurements of procedural blanks and samples from our reference strewn field, Jiddat al Harasis 073, performed in our system all show a good reproducibility and, for the strewn field samples, consistency with published data. We describe each improvement step in detail, discussing the advantages and disadvantages of all tested setups. By sharing our knowledge, we aim to inform and prevent others from making the same or similar detours in establishing 14C extraction systems for extraterrestrial samples.

中文翻译：

---

伯尔尼大学原位 14C 提取线性能更新

我们介绍了原位放射性碳的当前性能（14C) 伯尔尼大学的萃取线，带有改进的萃取和燃烧系统。经过三个主要步骤的改进，样品CO的提取2气体现在发生在铂坩埚内，由外部石英玻璃坩埚支撑。这种设置允许我们在不破坏真空的情况下将生产线作为一个封闭系统操作几个样品。在我们的系统中对来自我们的参考散布田地 Jiddat al Harasis 073 的程序空白和样品的测量都显示出良好的重现性，并且对于散布田地样品，与公布的数据保持一致。我们详细描述了每个改进步骤，讨论了所有测试设置的优缺点。通过分享我们的知识，我们旨在告知和防止其他人在建立14用于地外样品的 C 提取系统。