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Sakuma, Kazuyuki; Tsuji, Hideki*
no journal, ,
We focus on a behavior of dissolved radiocesium within Yokokawa dam reservoir in Fukushima prefecture. (1) Horizontal distribution of dissolved 
Cs concentration in reservoir water, (2) Cs concentration of a plankton, (3) Investigation for sources of dissolved Cs from an upstream catchment of the dam reservoir, (4) Simulation for dissolved Cs discharge from the upstream catchment of the dam reservoir were studied. These indicated that dissolved Cs concentration in water at dam inlet and outlet were decreasing and an organic matter is one of the dissolved Cs source in forested catchment. Additionally we developed a numerical model to simulate dissolved Cs concentration at the catchment outlet, which reasonably reproduced a observation data under base flow periods.
Yamada, Susumu; Machida, Masahiko; Watanabe, Masahisa
no journal, ,
no abstracts in English
Seki, Akiyuki; Suzuki, Kenta*; Takahashi, Yoshitomo*; Matsubara, Takeshi*; Suto, Shigeo*; Saito, Kimiaki; Takemiya, Hiroshi
no journal, ,
JAEA had collected and published radioactive monitoring data provided individually by government offices and local governments and so on. The amount of those data which were unified in same display format and accuracy had become enormous by six years after the accident had passed. To understand how much the radionuclide distribution changed, new contents which were prepared in maps and graphs were added in the site for publishing.