[2G17-22] Tungsten

[2G19] Quantitative analytical method of tritium in tungsten

(3)Quantitative tritium analysis in JET tiles

*Rion Nishida¹, Kazuaki Kasai¹, Yuuji Torikai¹, Naoko Asikawa^2,3, Hirohumi Nakamura⁴, Yutaka Sugimoto⁴, Suguru Masuzaki^2,3, Miyuki Yajima^2,3, Anna Widdowson⁵, Marek Rubel⁶ (1. Ibaraki Univ., 2. NIFS, 3. SOKENDAI, 4. QST, 5. UKAEA, 6. KTH Royal Institute of Technology)

Keywords:Quantitative tritium analysis, Tungsten, Chemical etching, JET divertor tiles

In order to evaluate tritium retention in fusion reactor materials, a new chemical etching method was used to analyze tungsten (W) divertor tiles of the 1^st JET ITER-like wall experiments.The W surface containing tritium is dissolved by a mixture of sodium hydroxide solution and hydrogen peroxide solution. A liquid scintillation counter measures tritium in a collected solution, enabling quantitative tritium measurement in the dissolved liquid .Dissolved surfaces on the W sample were selected by masking with plastic tape, and tritium amounts on different surfaces of the sample were compared.Multiple chemical etchings of approximately 1 μm each were performed on W samples. And tritium amounts of different depths from the top surface are confirmed as quantitative measurements.