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2 - Estimation of Environmental Releases of Radioactive Materials

from Part I - Transport of Radioactive Materials in the Environment

Published online by Cambridge University Press:  16 August 2019

Edited by
Teruyuki Nakajima ,
Toshimasa Ohara ,
Mitsuo Uematsu  and
Yuichi Onda
Teruyuki Nakajima
Affiliation:
University of Tokyo
Toshimasa Ohara
Affiliation:
National Institute for Environmental Studies, Japan
Mitsuo Uematsu
Affiliation:
University of Tokyo
Yuichi Onda
Affiliation:
University of Tsukuba, Japan
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Summary

The Fukushima Daiichi Nuclear Power Station (FDNPS) accident in Japan on 11 March 2011, which was triggered by a magnitude 9.0 earthquake that resulted in a tsunami, caused a month-long discharge of radioactive materials into the atmosphere. However, in the first stage of the accident, only monitoring cars near the FDNPS could collect monitoring data because of damage to the monitoring posts and stack monitor. The limited survey data from the monitoring cars from 12–13 March 2011 (NISA, 2011) showed that radioactive caesium and iodine were already detected at Okuma-machi and Namie-machi, close to the FDNPS around 8:00 JST on 12 March due to leakage from the containment vessel. In addition, increased air dose rates due to the deposition of radionuclides discharged by a hydrogen explosion at unit 1 were observed north of the FDNPS on 13 March.

Type
Chapter
Information
Environmental Contamination from the Fukushima Nuclear Disaster
Dispersion, Monitoring, Mitigation and Lessons Learned
 , pp. 50 - 61
Publisher: Cambridge University Press
Print publication year: 2019

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References

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