福岡県における福島第一原子力発電所事故初期の放射線影響評価

Translated title of the contribution: Early Radiological Impacts of Fukushima Daiichi Nuclear Power Plant Accident Fallout in Fukuoka Prefecture

楢崎 幸範, 竹村 俊彦, 天野 光, 石川 徹夫, 藤高 和信

Research output: Contribution to journalArticlepeer-review

Abstract

We have observed artificial radionuclides originated from the TEPCO Fukushima Daiichi Nuclear Power Plant accident. This paper presents our monitoring results(March to May, 2011) for (1) γ-ray dose rate (2) airborne radioactivity (3) radioactivity deposited onto the basin and (4) radioactivity in tap water. Regarding γ-ray dose rate, no increase was observed. A small amount of artificial radioactivity(<sup>131</sup>I, <sup>134</sup>Cs, <sup>136</sup>Cs, <sup>137</sup>Cs and <sup>132</sup>Te) was found from airborne dust samples. While <sup>131</sup>I was detected two weeks after the accident, <sup>134</sup>Cs and <sup>137</sup>Cs were detected three weeks after. Integrated amount of activity was 14mBq/m<sup>3</sup> for <sup>131</sup>I, 11mBq/m<sup>3</sup> for <sup>134</sup>Cs and 9.5mBq/m<sup>3</sup> for <sup>137</sup>Cs. The monitoring results indicated that a plume with relatively high radioactivity passed through our monitoring station during April 6 - 7. Atmospheric diffusion simulation analyses reveal this. <sup>131</sup>I, <sup>134</sup>Cs and <sup>137</sup>Cs were also measured from monthly-monitored deposition. Total depositions for three months were 4.2Bq/m<sup>2</sup> for <sup>131</sup>I, 0.85Bq/m<sup>2</sup> for <sup>134</sup>Cs and 0.84Bq/m<sup>2</sup> for <sup>137</sup>Cs. No artificial radionuclide was found for tap water samples. The dose from these artificial radionuclides was estimated to be 0.23μSv/y, which was too small to cause health effects.
Translated title of the contributionEarly Radiological Impacts of Fukushima Daiichi Nuclear Power Plant Accident Fallout in Fukuoka Prefecture
Original languageJapanese
Pages (from-to)847-855
Number of pages9
JournalRadioisotopes
Volume62
Issue number11
DOIs
Publication statusPublished - 2013

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