Separation and measurement of ^<129>I and ^<127>I in pre-nuclear-eramarine algae with ultra low ^<129>I/^<127>I isotopic ratios
Separation and measurement of ^<129>I and ^<127>I in pre-nuclear-eramarine algae with ultra low ^<129>I/^<127>I isotopic ratios
复制标题
具有超低 ^<129>I/^<127>I 同位素比的前核紫青藻中 ^<129>I 和 ^<127>I 的分离和测量
DOI：
10.1016/j.jhydrol.2009.07.022
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
H. Matsuzaki
中科院分区：
文献类型：
--
作者：
T. Ohta;Y. Mahara;T. kubota;T. Abe;H. Matsueda;T. Tokunaga;H. Matsuzaki
我们研究了用外流入型中空纤维膜萃取系统从超低浓度地下水中萃取~(85)Kr。我们的目标是开发一种能够在野外研究中有效地从大量地下水(104L)中提取Kr同位素以测量85Kr放射性的系统。在实地测试我们的Kr提取系统之前，我们通过实验确定了从地下水中有效提取Kr同位素所需的条件。通过在实验室中提取微量Kr，考察了从水中提取Kr的效率。在水温为11~29℃、流速小于24L/min的条件下，Kr和溶解于水中的O2的萃取率为99%，证明了该系统的分离效率足以从地下水中提取Kr同位素。然后，我们使用我们的方法从大阪京都大学和日本九州中部熊本平原的地下水中提取85Kr。结果表明，这种从地下水中提取85Kr的技术可以作为研究年轻地下水停留时间的有效工具。
We investigated extraction of the krypton (Kr) radioisotope85Kr from groundwater having an ultra-low concentration with a Kr extraction system using an external inflow type hollow fiber membrane. Our aim was to develop a system able to effectively extract Kr isotopes from a large volume of groundwater (104L) in field studies for measurement of85Kr radioactivity. Before testing our Kr extraction system in the field, we determined experimentally the conditions necessary for effective extraction of Kr isotopes from groundwater. We investigated the efficiency of Kr extraction from water by extracting trace amounts of Kr in the laboratory. With our system, we were able to extract 99% of Kr and O2dissolved in water at water temperatures ranging from 11 to 29°C and with a flow rate of less than 24L/min, confirming that the separation efficiency of the system was sufficient for extraction of Kr isotopes from groundwater. We then used our method to extract85Kr from groundwater at sites at Kyoto University in Osaka and on the Kumamoto Plain in central Kyushu, Japan. We showed that this technique for extracting85Kr from the groundwater can be an effective tool for investigating the residence time of young groundwater.