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Hagiwara, Kenta*; Ochi, Kotaro; Koike, Yuya*
Radioisotopes, 70(4), p.227 - 237, 2021/05
Behavior of radioactive caesium in river water and sediment in Tama river was investigated during 2012-2016. Concentrations of radioactive caesium in river water and sediment were decreased with time exponentially. Concentrations of suspended radioactive caesium, and radioactive caesium in sediment temporarily increased when sediments were resuspended due to rain. On the other hand, dissolved radioactive caesium was not easily impacted by this factor. Sequential extraction, elemental and crystal phase analysis were performed on the sediments and examined the chemical state of radioactive caesium as well as the adsorption mechanism. Radioactive caesium in sediment was present in a stable chemical form, and there is possibility that radioactive caesium was incorpolated in biotite.
Tsuruta, Tadahiko; Harada, Hisaya; Misono, Toshiharu
no journal, ,
no abstracts in English
Tsuruta, Tadahiko; Harada, Hisaya; Misono, Toshiharu; Matsuoka, Toshiyuki
no journal, ,
no abstracts in English
Masunaga, Kosuke; Tokoro, Chiharu*; Ohara, Yoshiyuki
no journal, ,
In Ningyo-toge Environmental Engineering Center, water level of mill tailings pond is planned to be lowered to reduce overflow risks caused by heavy rain etc., as a part of remediation activities of the Uranium Mine. It is known that the concentration of Fe and As and other elements in the mine drainage are decreased by retaining in the pond. The aims of this study are to reduce the load of water treatment facility and to determine the efficient countermeasure method for remediation of the mill tailings pond. To accomplish these, purification mechanisms of Fe and As in the pond were investigated, referring other studies. Chemical composition of water drainage in the pond was estimated by the chemical equilibrium analysis with advection using PHREEQC. The result of the simulation was almost reproducible for Fe. For As, it was reproducible when taking into account of surface complexation to ferrihydrite in sediment in the bottom of the pond.
Tsuruta, Tadahiko; Harada, Hisaya*; Misono, Toshiharu
no journal, ,
no abstracts in English
Cs dissolution from dam lake sediment considering temperature and dissolved oxygen conditionTsuji, Hideki*; Hayashi, Seiji*; Higashi, Hironori*; Sakuma, Kazuyuki; Yoshimura, Kazuya; Funaki, Hironori; Nakanishi, Takahiro; Tsuruta, Tadahiko
no journal, ,
no abstracts in English
Katengeza, E.*; Sanada, Yukihisa; Ochi, Kotaro; Iimoto, Takeshi*
no journal, ,
