迅速試料燃焼装置を用いたOBT分析の前処理の合理化

Optimization of pretreatment process of oxygen combustion vessel in OBT analysis

藤原 健壮 ; 桑田 遥*

Fujiwara, Kenso; Kuwata, Haruka*

環境中のトリチウムの影響評価に際しては、被ばく上より重要な有機結合型トリチウム(OBT)の濃度評価が必要である。しかし、従来のOBT分析法では前処理に時間がかかることから、原子力機構福島環境安全センターでは、時間短縮のため、凍結乾燥と加温乾燥を組み合わせた手法を確立した。本発表では、更なる迅速化・精度向上等を目的として、魚種, サンプル処理量等

Tritium is included in liquid waste from Tokyo Electric Fukushima Daiichi Nuclear Power Station. Since different concentrations of tritium in marine products and seawater was reported, concentrations of Organically Bound Tritium (OBT) and Tissue Free Water Tritium (TFWT) in marine products also have differences. Therefore, it is important to distinguish the concentration of OBT and TFWT in marine products. However, a chemical procedure of OBT analysis needs very long time because a pretreatment process is complicated. Thus, for environmental monitoring, a rapid analytical method for OBT in marine products by using oxygen combustion vessel was developed. In the case of pretreatment process combined freeze-drying with heating-drying, the total analysis time was shorter than a conventional method from 14 to 7 days.