Isotope Hydrology Laboratory, The International Atomic Energy Agency, Vienna, Austria.
Isotope Hydrology Laboratory, The International Atomic Energy Agency, Vienna, Austria; Noble Gas Mass Spectrometry Laboratory, University of Oxford, Department of Earth Sciences, UK.
Appl Radiat Isot. 2022 Nov;189:110450. doi: 10.1016/j.apradiso.2022.110450. Epub 2022 Sep 13.
The long-lived radio-krypton isotope Kr (t = 2.29 × 10 yr) is an ideal tracer for old groundwater age dating in the range of 10-10 years which goes beyond the reach of radio-carbon (C) age dating. Analytical breakthrough made over the last two decades in Atom Trap Trace Analysis (ATTA) has enabled the use of this isotope with extremely low abundance (Kr/Kr = 6 × 10) to be used as a practical dating tool for very old groundwater. The International Atomic Energy Agency aims to provide this new isotope tool for better groundwater resource management of Member States and developed a field sampling device to collect dissolved gas samples from groundwater and a system to separate and purify trace amounts of krypton from the gas samples for the ATTA analysis. The design, setup and performances of our sampling and purification systems are described here. Our system can produce a high purity aliquot of about 5 μL of krypton from 5 L of air sample (recovery yield of >90%). The samples made by our system were confirmed to be acceptable for the ATTA analysis.
长寿命放射性氪同位素 Kr（t = 2.29 × 10 年）是一种理想的示踪剂，可用于放射性碳（C）测年范围之外的 10 到 10 年的老地下水年龄测定。过去二十年在原子捕获痕量分析（ATTA）方面的分析突破，使这种极低丰度（Kr/Kr = 6 × 10）的同位素可用作非常老的地下水的实际测年工具。国际原子能机构旨在为成员国提供这种新的同位素工具，以更好地管理地下水资源，并开发了一种现场采样装置，从地下水中采集溶解气体样本，并开发了一种系统，从气体样本中分离和纯化痕量氪，以供 ATTA 分析。本文介绍了我们的采样和净化系统的设计、设置和性能。我们的系统可以从 5 升空气样本中产生约 5 微升的高纯度氪馏分（回收率>90%）。我们系统制备的样品经确认可用于 ATTA 分析。
