Low-volume Electrolytic Enrichment for Tritium Measurement Using Improved Solid Polymer Electrolyte System at NIFS and Its Application

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  • Akata Naofumi
    Radiation Chemistry Department, Institute of Radiation Emergency Medicine, Hirosaki University; 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan Institute of Radiochemistry and Radioecology, University of Pannonia, H-8201 Veszprém, P.O.B.: 158, Hungary.
  • Iwata Chie
    National Institute for Fusion Science, National Institute of Natural Sciences; 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
  • Kato Akemi
    National Institute for Fusion Science, National Institute of Natural Sciences; 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
  • Tanaka Masahiro
    National Institute for Fusion Science, National Institute of Natural Sciences; 322-6 Oroshi-cho, Toki, Gifu 509-5292, Japan
  • Tazoe Hirofumi
    Radiation Chemistry Department, Institute of Radiation Emergency Medicine, Hirosaki University; 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
  • Shima Nagayoshi
    Kyushu Environmrntal Evaluation Association; 1-10-1 Matsukadai, Higashi-ku, Fukuoka 813-0004 Japan
  • Ichiyanagi Kimpei
    Kumamoto University; Kurokami 2-39-1, Chuo-ku, Kumamoto, 860-8555, Japan
  • Hegedűs Miklós
    Radiation Physics Department, Institute of Radiation Emergency Medicine, Hirosaki University; 66-1 Hon-cho, Hirosaki, Aomori 036-8564, Japan
  • Bátor Gergő
    Institute of Radiochemistry and Radioecology, University of Pannonia, H-8201 Veszprém, P.O.B.: 158, Hungary.
  • Kovács Tibor
    Institute of Radiochemistry and Radioecology, University of Pannonia, H-8201 Veszprém, P.O.B.: 158, Hungary.
  • Kakiuchi Hideki
    Department of Radioecology, Institute for Environmental Sciences; 1-7 Ienomae, Obuchi, Rokkasho, Aomori 039-3212 Japan

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<p>We evaluated the enrichment factor of tritium for an improved solid polymer electrolyte (SPE) system. In this system, water sample reservoirs were made of double-glazed glass, and cooling water was circulated in the double glass to cool the sample. As the result, a tritium enrichment factor of 5.00 was obtained and the MDL of tritium measurement with a low-background liquid scintillation counter coupled to this improved enrichment process was determined to be approximately 0.062 Bq L-1. Tritium concentration in monthly precipitation at Kumamoto was measured using this method combining a low-background liquid scintillation counter and this improved SPE system.</p>

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