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Fixed point observations and characterization of radioactive caesium in Tama river

多摩川における放射性セシウムの定点観測とキャラクタリゼーション

萩原 健太*; 越智 康太郎 ; 小池 裕也*

Hagiwara, Kenta*; Ochi, Kotaro; Koike, Yuya*

多摩川中流域で定点観測を実施し、河川水及び底質中の放射性セシウムの挙動を2012年から2016年にかけて調査した。河川水及び底質中の放射性セシウム濃度は、時間とともに減少した。雨により水中が懸濁すると、懸濁態放射性セシウムと底質中放射性セシウムの濃度が一時的に増加した。一方、溶存態放射性セシウムはこの影響を受けなかった。底質に関して逐次抽出、元素および結晶相分析を行い、放射性セシウムの化学状態と底質への吸着メカニズムを調査した。底質中の放射性セシウムは安定した化学形態で存在しており、バイオタイトが放射性セシウムを取り込んでいる可能性があった。

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.

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