Accumulation of organically bound tritium in Arabidopsis thaliana cultivated in soil containing tritiated water
Accumulation of organically bound tritium in Arabidopsis thaliana cultivated in soil containing tritiated water
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含氚水土壤中拟南芥有机结合氚的积累
DOI：
10.1016/j.fusengdes.2021.112787
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发表时间：
2021
影响因子：
1.7
通讯作者：
Toshiharu Takeishi
中科院分区：
文献类型：
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作者：
Takahiro Matano;Kazunari Katayama;Toshiharu Takeishi
氚对于在聚变反应堆中产生D-T反应至关重要，预计将用作下一代发电技术。如果氚因意外事故释放到环境中，最终可能通过植物转移到人体。因此，需要从辐射防护的角度来了解氚在植物体内的行为。本研究构建了一个密闭的植物培养系统，并在供应氚水的腐殖土中培养了拟南芥。然后，通过水浸，干燥，同位素交换和燃烧反应的结果表明，可交换的有机结合氚通过同位素交换反应向组织自由水的传质速率大于组织自由水氚向周围水的传质速率，而非同位素交换的氚所占的百分比则小于组织自由水氚所占的百分比。可交换的有机结合态氚占累积氚总量的2.5 - 9.0%。
Tritium is essential for generating D-T reactions in a fusion reactor, which is expected to be used as a next power generation technology. If tritium is released into the environment due to unexpected accidents, it may transfer to human body through plants eventually. Therefore, it is needed to understand the behavior of tritium in plants from the viewpoint of radiation protection. In this study, an airtight plant cultivation system was constructed and Arabidopsis thaliana was cultivated in the humus supplied with tritiated water. Then, the amount of tritium accumulated in the collected samples was investigated by water immersion, drying, isotope exchange and combustion.It was suggested that the mass transfer rate of exchangeable organically bound tritium to tissue free water by the isotope exchange reaction was faster than the mass transfer rate of tissue free water tritium to the surrounding water.The percentage of non-exchangeable organically bound tritium was in the range from 2.5 to 9.0 % to the total amount of tritium accumulated.