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Report No.
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Observation of fallout deposition in an outdoor swimming pool 50 km away from the Fukushima Daiichi Nuclear Power Plant

Saegusa, Jun; Yasuda, Ryo; Kurikami, Hiroshi 

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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Category:Nuclear Science & Technology

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