The background levels of atmospheric tritium concentration in the environment at NIFS Toki site of Japan
- National Inst. for Fusion Science, 322-6 Oroshi, Toki, 509-5292 (Japan)
- Graduate School of Engineering, Nagoya Univ., Furo, Chikusa-ku, Nagoya, 464-8603 (Japan)
- Graduate School of Science and Technology, Kumamoto Univ., Kurokami, Kumamoto, 860-8555 (Japan)
- Radioisotope Center, Kyushu Univ., Hakozaki, Higashi-ku, Fukuoka, 812-8581 (Japan)
Atmospheric tritium concentrations at the National Inst. for Fusion Science (NIFS) Toki site of Japan, where the Large Helical Device (LHD) has been operating, were measured considering future deuterium plasma experiments and environmental safety. The major chemical forms of atmospheric tritium are water (HTO), hydrogen (HT) and methane (CH{sub 3}T). Average tritium concentrations of HTO, HT and CH{sub 3}T observed from January 2003 to March 2006 were 9.0 mBq/m{sup 3}, 9.0 mBq/m{sup 3} and 2.0 mBq/m{sup 3}, respectively. To examine about the systematic error of the air sampling device, we cross-checked with the sampling device of Kumamoto Univ.. The values obtained with both devices were almost consistent. The HTO concentration principally depends on humidity in air. The HTO concentration in the collected water and the HT concentration tend to show seasonal variation. The atmospheric tritium levels measured at Toki were consistent comparing with another environmental values measured in Japan. The present atmospheric tritium monitoring would be useful for safety consideration. (authors)
- OSTI ID:
- 22109362
- Journal Information:
- Fusion Science and Technology, Vol. 54, Issue 1; Conference: 8. international conference on tritium science and technology, Rochester, NY (United States), 16-21 Sep 2007; Other Information: Country of input: France; 12 refs; ISSN 1536-1055
- Country of Publication:
- United States
- Language:
- English
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