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Report No.

Behavior of iodine in the soil-water and rock-water systems

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

To understand behavior of iodine in shallow and deep underground is essential because radioactive wastes, which contain high levels of radioiodine, are planned to be stored in underground nuclear-waste repository. We determined iodine distribution, speciation, and isotope ratio ($$^{129}$$I/$$^{127}$$I), to investigate long-term migration of iodine in diatomaceous and siliceous shales, using core and groundwater samples collected at JAEA Horonobe underground research center. Iodine exists as I- in groundwater, while that in shales is a mixture of organic and inorganic I.



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