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Long-term migration of iodine in sedimentary rocks based on iodine speciation and $$^{129}$$I/$$^{127}$$I ratios

Togo, Yoko*; Takahashi, Yoshio*; Amano, Yuki   ; Matsuzaki, Hiroyuki*; Suzuki, Yohei*; Muramatsu, Yasuyuki*; Iwatsuki, Teruki  

Radioactive iodine ($$^{129}$$I) is one of the available indexes of long-term migration of groundwater solutes, because of its long half-life (15.7 million years) and low sorption characteristics. All rock and groundwater samples were collected at Horonobe underground research center. Species of iodine in groundwater was mainly I$$^{-}$$. $$^{129}$$I/$$^{127}$$I isotope ratios in groundwater were lower than that in rocks and almost constant at various depths, demonstrating that iodine in groundwater was released from deeper than co-existing rocks.



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