エアロゾル研究
Online ISSN : 1881-543X
Print ISSN : 0912-2834
特集「福島第一原発事故による放射性エアロゾル」
東電福島第一原子力発電所事故直後の東日本における放射性セシウムの時空間分布―大気環境常時測定局のSPM計の使用済みテープろ紙分析データの解析―
鶴田 治雄大浦 泰嗣海老原 充森口 祐一大原 利眞中島 映至
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2017 年 32 巻 4 号 p. 244-254

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The spatio-temporal distributions of atmospheric 137Cs concentrations in and around the Fukushima prefecture just after the Fukushima Daiichi Nuclear Power Plant (FD1NPP) accident were retrieved, by measuring radionuclides in suspended particulate matter (SPM) hourly collected on used filter-tapes of operational air quality monitoring stations. Analyzing a published dataset of radiocesium (134Cs and 137Cs) at around 100 SPM monitoring sites, 10 radioactive plumes/polluted air masses in which the maximum 137Cs concentrations were higher than 10 Bq m-3 were found in the period of March 12–23, 2011. In these plumes, 5 plumes were transported to the eastern and/or central parts of the Fukushima prefecture, and another 5 plumes were transported to the Kantou area located more than 100 km south of the FD1NPP, respectively. In the period, the maximum 137Cs concentration of about 575 Bq m-3 was observed in the east coast of the Fukushima prefecture on the evening of March 12, 2011, after a vent process and the hydrogen explosion of Unit 1. Furthermore, high 137Cs concentrations of around 10 Bq m-3 were found in the northern part of the FD1NPP on the morning of March 21 when a strong northerly wind began to blow. These results indicate that further study is expected on the relationship between the release of radionuclides and the events happened in the reactors of the FD1NPP, and on the effects of the vertical structure of the atmosphere on the surface concentrations of radionuclides.

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