Post-accident sporadic releases of airborne radionuclides from the Fukushima Daiichi nuclear power plant site

2017 Fiscal Year Final Research Report

• Project/Area Number: 26293150
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Hygiene and public health
• Research Institution: Kyoto University
• Principal Investigator: Harada Kouji 京都大学, 医学研究科, 准教授 (80452340)
• Co-Investigator(Kenkyū-buntansha): 小泉 昭夫 京都大学, 医学研究科, 名誉教授 (50124574)
• Research Collaborator: Steinhauser Georg Leibniz Universität Hannover, Professor ; NIISOE Tamon 京都大学, 防災研究所, 研究員 (30531735)
• Project Period (FY): 2014-04-01 – 2018-03-31
• Keywords: 環境化学 / 曝露評価 / 放射性物質 / 福島第一原発事故 / 環境モデリング

Outline of Final Research Achievements

Atmospheric diffusion simulation based on the release of radioactive materials from Fukushima Daiichi Nuclear Power Station was conducted. The atmospheric concentrations measured in Minamisoma city in August 2013 was reproduced under the simulation. Radioactive strontium and plutonium analysis was performed for 21 soil samples at undisturbed places at 10 sites in Minami Soma City Haramachi District, where dust was supposed to deposit. Radioactive strontium was observed at relatively high levels in several points. It is suggested that the diffusion kinetics may be different between radiocesium and radiostrontium. These results showed that the secondary releases of coarse particles had a significant effect on fallout and could cause agricultural product contamination including rice.

Free Research Field

環境衛生学