Radiocesium concentration in indoor air during residential house cleaning in Fukushima Dai-ichi nuclear power plant evacuation areas

Naohide Shinohara, Hiroko Yoshida-Ohuchi

研究成果: Article査読

4 被引用数 (Scopus)

抄録

After the Fukushima Dai-ichi Nuclear Power Plant (FDNPP)accident, outdoor decontamination was conducted by the Japanese Government, whereas indoor contamination was the responsibility of individual residents. However, no data exist regarding 137Cs exposure during indoor cleaning. Therefore, indoor 137Cs radioactivity concentrations in indoor air were determined during cleaning in 60 houses within the evacuation area near the FDNPP, Fukushima Prefecture, Japan. Radiocesium activity concentrations per cubic meter of indoor air during dusting (mean ± SD (median))was 6.8 ± 7.9 (4.7)and 1.6 ± 2.7 (0.78)Bq/m3 for all aerodynamic diameter of aerosol particle and PM2.5, respectively. Radiocesium activity concentrations in indoor air decreased with decreasing the aerodynamic diameter of aerosol particles (mean: 0.099, 0.22, 0.41, 0.92, 2.2, and 2.9 Bq/m3 for the aerodynamic diameter of <0.25, 0.25–0.5, 0.5–1.0, 1.0–2.5, 2.5–6.6, and >6.6 μm, respectively)and was inversely proportional to the square of the distance from the FDNPP. Indoor 137Cs radioactivity concentrations were significantly higher during dusting than during vacuuming with either a cyclone handy cleaner or a normal vacuum cleaner. The mean deposited activities in tracheobronchial and alveolar regions was estimated to be 1.9 and 2.8 Bq, respectively, during a 2-h dusting period in the studied houses. For values below the detection limit, half of the detection limit was used for calculating the means and SDs.

本文言語English
ページ(範囲)127-134
ページ数8
ジャーナルJournal of Environmental Radioactivity
205-206
DOI
出版ステータスPublished - 2019 9

ASJC Scopus subject areas

  • 環境化学
  • 廃棄物管理と処理
  • 汚染
  • 健康、毒物学および変異誘発

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