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JAEA Reports

Survey results for the transition of the air dose rate after the Cabinet Office decontamination model demonstration project; 1st-11th survey results summary (Contract research)

Kawase, Keiichi; Kitano, Mitsuaki; Watanabe, Masanori; Yoshimura, Shuichi; Kikuchi, Shiro; Nishino, Katsumi*

JAEA-Review 2017-006, 173 Pages, 2017/03

JAEA-Review-2017-006.pdf:35.6MB
JAEA-Review-2017-006-appendix(CD-ROM).zip:0.52MB

Survey of a transition of the air and surface dose rate was conducted for the area where the Cabinet Office decontamination model demonstration project was implemented. The area includes 15 districts in 9 municipalities identified by the Ministry of the Environment. We investigated 11 times from October, 2012 to October, 2015. Measurement of the air dose rate in this study was carried out in two methods using the fixed-point measurement and gamma plotter H using a NaI scintillation survey meter etc. As fixed-point measurement, set measurement point in the first survey for (fixed point), it was subjected to measurement of the surface dose rate to continue (1cm height) and space dose rate (1m height). In addition surface specific dose rate distribution measurement using a gamma plotter H (5cm and 1m height) was also performed together. As a result of the fixed-point measurement and gamma plotter H surface measurements, space dose rate from the first survey to the 11th survey shows the downward trend. We consider that there is no movement of radioactive pollutants from outside decontamination model project area into decontamination model project area.

Journal Articles

Measurements and evaluations of air dose rates around Fukushima, 5; Characteristics of air dose rate distribution in the environment around the Fukushima Nuclear Power Plant site

Mikami, Satoshi; Matsuda, Norihiro; Ando, Masaki; Kinase, Sakae; Kitano, Mitsuaki; Kawase, Keiichi; Matsumoto, Shinichiro; Yamamoto, Hideaki; Saito, Kimiaki

Radioisotopes, 64(9), p.589 - 607, 2015/09

This article presents the features of regional distributions and temporal changes in air dose rate and radionuclide deposition densities in Fukushima on the basis of analyses on large-scale environmental monitoring results using diverse methods. The continuity of decontamination effects is discussed according to repeated monitoring data after the decontamination model project. Further, some examples are shown on the projection of air dose rates together with the ecological half lives for different land uses.

Journal Articles

Development of Monju Easy-to-Introduce System for Total Evaluation of Reactor Core

Kitano, Akihiro; Teruyama, Hidehiko; Nishi, Hiroshi; Yamaoka, Mitsuaki*; Moriki, Yasuyuki*; Nakagawa, Masatoshi*

Saikuru Kiko Giho, (15), p.1 - 16, 2002/06

None

Oral presentation

JAEA's technical activities for environmental remediation of Fukushima; Decontamination pilot project; Result of environmental remediation by using various removal methods, 2 Forest and farmland

Kurikami, Hiroshi; Mori, Hideharu; Kitano, Mitsuaki

no journal, , 

This paper shows the outcomes of decontamination of forest and farmland in the decontamination pilot project. For forest, removal of fallen leaves was not effective, while removal of humus resulted in obvious decrease of dose rate at the surface. In farmland, stirring/dilution, reversal tillage, turning-over and removal of surface soil were applied according to the contamination level. Turning-over and removal of surface soil were much more effective than the other techniques in the viewpoint of dose rate decrease, but removal of surface soil produced much more stuff.

Oral presentation

JAEA's technical activities for environmental remediation in Fukushima; Decontamination pilot project; Work results of Group A

Kitano, Mitsuaki; Sato, Takashi; Kawase, Keiichi

no journal, , 

no abstracts in English

Oral presentation

JAEA's technical experiences and lessons learned for environmental remediation of Fukushima, 3; Temporary storage for removed contaminants

Saegusa, Hiromitsu; Kurikami, Hiroshi; Funaki, Hironori; Sato, Takashi; Kitano, Mitsuaki; Sasayama, Yasuo; Wada, Takao

no journal, , 

no abstracts in English

6 (Records 1-6 displayed on this page)
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