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Novel method for determination of tritium depth profiles in metallic samples

Elina Pajuste, Gunta Kizane, Liga Avotina, Anete Stine Teimane, Andris Lescinskis, Karlis Vonda, JET Contributors2019年被引用 2Nuclear FusionIF 3出版社

Tritium accumulation in fusion reactor materials is considered a serious radiological issue, therefore a lot of effort has been concentrated on the development of radiometric techniques. A novel method, based on gradual dissolution, for the determination of the total tritium content and its depth profiles in metallic samples is demonstrated. This method allows for the measurement of tritium in metallic samples after their exposure to a hydrogen and tritium mixture, tritium containing plasma or after irradiation with neutrons resulting in tritium formation. In this method, successive layers of metal are removed using an appropriate etching agent in the controlled regime and the amount of evolved gases are measured by means of chromatography (gas composition and release rate) and a proportional gas flow detector (tritium). Results for the tritium profiles in neutron irradiated, plasma exposed and gas loaded beryllium are reported.

日本語訳

核融合炉材料におけるトリチウムの蓄積は、深刻な放射線学的問題と見なされているため、放射測定技術の開発に多大な努力が注がれてきた。金属試料中の全トリチウム含有量とその深さ分布を決定するための、漸次溶解に基づく新規手法を実証する。本手法により、水素とトリチウムの混合ガスへの曝露後、トリチウム含有プラズマへの曝露後、またはトリチウム生成を生じる中性子照射後の金属試料中のトリチウム測定が可能となる。本手法では、制御された条件下で適切なエッチング剤を用いて金属の層を順次除去し、発生したガスをガスクロマトグラフィー(ガス組成と放出速度)および比例計数管(トリチウム)によって測定する。中性子照射、プラズマ曝露、およびガス曝露されたベリリウムにおけるトリチウム分布の結果を報告する。

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