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Suzuki, Yohei*; Fukuda, Akari; Konno, Yuta*; Kozuka, Mariko*; Hagiwara, Hiroki; Aosai, Daisuke; Takeno, Naoto*; Mizuno, Takashi
no journal, ,
Hasegawa, Yusuke*; Fukushi, Keisuke*; Maeda, Koshi*; Yamamoto, Yuhei; Aosai, Daisuke; Mizuno, Takashi
no journal, ,
Maeda, Koshi*; Fukushi, Keisuke*; Hasegawa, Yusuke*; Yamamoto, Yuhei; Aosai, Daisuke; Mizuno, Takashi
no journal, ,
Sakai, Ryutaro; Munakata, Masahiro; Seguchi, Mariko*; Ooka, Masao*; Ichikawa, Yasuo*; Nakamura, Masaru*; Ishibashi, Junichiro*
no journal, ,
In the safety assessment for a geological disposal of radioactive waste, it is important to establish validation methods for deep groundwater flow system to estimate radionuclide migration to human environment through groundwater flow. This study discussed the method which estimates groundwater mixing condition and groundwater flow process using principal component analysis to groundwater chemistry and isotopic compositions in case of Horonobe area. The results demonstrated that there are three component of deep groundwater which has long residence time and surface water derived from meteoric water in this area.
Th in the Pacific Ocean and their relation to advection and diffusionOkubo, Ayako; Obata, Hajime*; Gamo, Toshitaka*; Yamada, Masatoshi*
no journal, ,
We investigated the vertical distribution of total Th in mid latitudes of the Pacific Ocean. The west to east section of Th shows a strong gradient in the deep waters around 170 degree east and 110 degree west. At depths of 2000 to 4000 m and 4000 m to bottom within the time-scale of scavenging residence time of Th, the horizontal eddy diffusion could reach 1100 to 1400 km and 400 to 700 km, respectively. The horizontal eddy diffusion transport is too weak to affect Th distribution in the deep layers between each station in this study area.
Onuki, Toshihiko; Jiang, M.*; Utsunomiya, Satoshi*; Tanaka, Kazuya*
no journal, ,
We found that Sm(III) phosphate minerals were formed on the cells surface of gram negative bacterium after exposure of Sm(III) solution with the resting cells. TEM-SAED analysis showed that Sm-monazite was developed directly from the surface of cells. Sm(III) ions were first adsorbed by the functional groups of cells surface, followed by the chemical states change by the reaction with phosphate ions released from inside the yeast cells.