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Observation of fallout deposition in an outdoor swimming pool 50 km away from the Fukushima Daiichi Nuclear Power Plant

福島第一原子力発電所から50km離れた遊泳用屋外プールにおける放射性降下物の観測

三枝 純; 安田 良; 操上 広志 

Saegusa, Jun; Yasuda, Ryo; Kurikami, Hiroshi

福島第一原子力発電所事故を起因とする放射性降下物の評価を福島県内の遊泳用屋外プールについて行った。発電所から50km離れたプールでは、上層水及びプール底の堆積物の放射性セシウム濃度は、2011年8月時点でそれぞれ170Bq L$$^{-1}$$, 0.36MBq kg$$^{-1}$$と評価された。降雨・蒸発による水収支を考慮した結果、降下した放射性セシウムは0.32$$pm$$0.03MBq m$$^{-2}$$($$k$$=1)と見積もられ、近隣の地区にて、航空機サーベイ法, in-situ Ge法, 土壌サンプリング法により評価された値を裏付けた。上層水中の$$^{89}$$Sr, $$^{90}$$Sr, $$^{238}$$Pu, $$^{239+240}$$Pu濃度はいずれも検出下限値(それぞれ2, 0.1, 0.002, 0.002Bq L$$^{-1}$$)以下であった。

After the Fukushima Daiichi Nuclear Power Plant (NPP) accident, the fallout deposited in an outdoor swimming pool was observed. At a pool situated 50 km away from the NPP, the average concentrations of radiocesium for the water and sediment were quantified as 170 Bq L$$^{-1}$$ and 3.6$$times$$10$$^{5}$$ Bq kg$$^{-1}$$, respectively. Taking account of these concentrations and of the water balance in and around the pool, the deposition density of radiocesium, as of August 2011, was precisely estimated to be 0.32$$pm$$0.03 MBq m$$^{-2}$$ ($$k$$ = 1). The density corroborated the previous results obtained by the other methods, i.e., airborne surveys, in-situ Ge surveys and soil samplings at neighboring locations. The radioactivity concentrations of $$^{89}$$Sr, $$^{90}$$Sr, $$^{238}$$Pu and $$^{239+240}$$Pu in the water were all less than the minimum detectable activities - 2, 0.1, 0.002 and 0.002 Bq L$$^{-1}$$, respectively.

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パーセンタイル:43.74

分野:Nuclear Science & Technology

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