VARIATION OFATMOSPHERIC TRITIUM CONCENTRATION IN THREE CHEMICAL FORMS AT TOKI, JAPAN: 2004-12.

Atmospheric tritium concentrations of HTO, HT and CH₃T have been measured at Toki, Japan, for the environmental impact assessment of tritium for a fusion test facility. According to the data from 2004 to 2012, the concentrations of HT and HTO in water vapour tend to increase in spring. The seasonal variation in HT concentration at Toki was compared with the H₂ concentration between 1990 and 2005 at Tae-ahn Peninsula, Republic of Korea, which is at approximately the same latitude as Toki. The monthly average of HT-specific activity varied from 1.24 × 10⁵ to 1.76 × 10⁵ TU. The peak of the monthly average H₂ concentration did not match that of HT. This indicates that the mechanism of the production or the source of HT might be different from the production mechanism of H₂. [ABSTRACT FROM AUTHOR]