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瀬古 典明; 片貝 秋雄; 長谷川 伸; 玉田 正男; 笠井 昇; 武田 隼人*; 須郷 高信; 斎藤 恭一*
Nuclear Technology, 144(2), p.274 - 278, 2003/11
被引用回数:129 パーセンタイル:98.72(Nuclear Science & Technology)海水中に溶存するウランの濃度は3mg/mであるが、世界全体の海水ウランの総量は45億トンにのぼる。海水中のウランの回収に高い性能を有する高分子捕集材(ウラン捕集材)を用いる吸着法は、従来法に比べ経済的にすぐれる。吸着法ではウラン捕集材は吸着床に充填して使用する。原研は日本沖合7kmの太平洋で、深さ20mの海域で、上面サイズが16m、高さが16cmの吸着床を浸漬した。吸着床には総重量350kg,52000枚のウラン捕集材で構成される捕集材カセットを充填した。総浸漬期間240日の実海域試験でイエロケーキとして1kgのウランを回収することに成功した。
大山 卓也; 石川 浩康
no journal, ,
To prevent inflow of radiocedium with suspended solids (SS) into farmland and increase in air dose rate of the river bank in the midstream and downstream, it is important to reduce SS in the river water; therefore we newly developed the test equipment using non-woven fabrics as a trapping material to capture and reduce the SS in running small river water. Authors installed this equipment into the small river which is located in mountainous area surrounded by forests where radionuclides released from the Fukushima Daiichi Nuclear Power Plant were deposited. Two turbidity gauges are installed in inflow and outflow point of this equipment and the turbidity has been continuously measured. From the result of a comparison of turbidity between inflow point and outflow point, a turbidity of inflow point is always higher than outflow point during ordinary water-level; this equipment can capture and reduce the SS in the river water. Through the analysis of particle size distribution, identification of minerals and measurement of concentration of radioactive Cs of the captured SS in the non-woven fabric should be carried out, to clarify the effectiveness of this equipment and non-woven fabrics for reducing the radioactive Cs in small rivers in the future.