松波寿弥，申文浩，高橋義彦，北島枝織，土屋貴史，信濃卓郎, ゲル化法を用いた懸濁物質を含む農業関連水試料中の放射性セシウムの定量, RADIOISOTOPES, 64(11), 681-686, 2015.

松波寿弥，申文浩，高橋義彦，北島枝織，土屋貴史，信濃卓郎, ゲル化法を用いた懸濁物質を含む農業関連水試料中の放射性セシウムの定量, RADIOISOTOPES, 64(11), 681-686, 2015.

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https://www.jstage.jst.go.jp/article/radioisotopes/64/11/64_681/_article/-char/ja/

東京電力福島第一原子力発電所事故以降，農業用水など潅漑水を介して水田に流入する放射性セシウムに関する調査が広く行われている。懸濁物質(SS)を含む水試料を直接測定した場合，測定中のSSの沈降により放射性セシウム濃度が過大評価される可能性が指摘されている。調査したほとんどの試料において直接法による定量値は分画法あるいはゲル化法による定量値より高くなった。ゲル化法はSSを含む多様な農業関連水試料に適用可能であり，簡単な前処理で，安定的に正確な定量値が得られた。

After the TEPCO Fukushima Dai-ichi Nuclear Power Plant accident in 2011, the radiocaesium, which flowed into the paddy fields via irrigation water, have been widely investigated. When the concentration of radiocaesium in the water samples containing suspended solids were directly measured using a high purity germanium detector with a 2L marinelli beaker, the radiocaesium concentration might be overestimated due to the sedimentation of the suspended solids during the measurement time. In fact, the values obtained by the direct method were higher than those obtained by the filtering method and/or the gelling method in most of the agriculture-related water samples. We concluded that the gelling method using sodium polyacrylate can be widely adapted for the analysis of the total radiocaesium in the agriculture-related water samples because of its many advantage such as simple preparation procedure, accurate analysis values, excellent long-term stability of geometry and low operating cost.

Key Words : Agriculture-related water, gelling method, suspended solid, radiocaesium