A GIS-based evaluation of the effect of decontamination on effective doses due to long-term external exposures in Fukushima

Yasutaka, Tetsuo; Iwasaki, Yumi; Hashimoto, Shizuka; Naito, Wataru; Ono, Kyoko; Kishimoto, Akira; Yoshida, Katsumi; Murakami, Michio; Kawaguchi, Isao; Oka, Tetsushi; Nakanishi, Junko

doi:10.1016/j.chemosphere.2013.06.083

Cited by 28 publications

(19 citation statements)

References 7 publications

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“…External exposure can be determined from personal dosimeters [6], calculated from ambient dose monitoring and shielding factors [7], or estimated by using numerical dispersion models [8]. Internal exposure from inhalation can be estimated by air monitoring [9] or by numerical dispersion models [8], [10].…”

Section: Introductionmentioning

confidence: 99%

Estimated Dietary Intake of Radionuclides and Health Risks for the Citizens of Fukushima City, Tokyo, and Osaka after the 2011 Nuclear Accident

Murakami

Oki

2014

PLoS ONE

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The radionuclides released from the Fukushima Daiichi nuclear power plant in 2011 pose a health risk. In this study, we estimated the 1st-year average doses resulting from the intake of iodine 131 (131I) and cesium 134 and 137 (134Cs and 137Cs) in drinking water and food ingested by citizens of Fukushima City (∼50 km from the nuclear power plant; outside the evacuation zone), Tokyo (∼230 km), and Osaka (∼580 km) after the accident. For citizens in Fukushima City, we considered two scenarios: Case 1, citizens consumed vegetables bought from markets; Case 2, citizens consumed vegetables grown locally (conservative scenario). The estimated effective doses of 134Cs and 137Cs agreed well with those estimated through market basket and food-duplicate surveys. The average thyroid equivalent doses due to ingestion of 131I for adults were 840 µSv (Case 1) and 2700 µSv (Case 2) in Fukushima City, 370 µSv in Tokyo, and 16 µSv in Osaka. The average effective doses due to 134Cs and 137Cs were 19, 120, 6.1, and 1.9 µSv, respectively. The doses estimated in this study were much lower than values reported by the World Health Organization and the United Nations Scientific Committee on the Effects of Atomic Radiation, whose assessments lacked validation and full consideration of regional trade in foods, highlighting the importance of including regional trade. The 95th percentile effective doses were 2–3 times the average values. Lifetime attributable risks (LARs) of thyroid cancers due to ingestion were 2.3–39×10−6 (Case 1) and 10–98×10−6 (Case 2) in Fukushima City, 0.95–14×10−6 in Tokyo, and 0.11–1.3×10−6 in Osaka. The contributions of LARs of thyroid cancers due to ingestion were 7.5%–12% of all exposure (Case 1) and 12%–30% (Case 2) in Fukushima City.

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Section: Introductionmentioning

confidence: 99%

Estimated Dietary Intake of Radionuclides and Health Risks for the Citizens of Fukushima City, Tokyo, and Osaka after the 2011 Nuclear Accident

Murakami

Oki

2014

PLoS ONE

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“…respectively), the environmental radiation dose rate is estimated to decrease over a long period in the natural environment 5,7) . Past studies have shown that decontamination in the form of soil removal is thought to be an effective method for decreasing the dose rate of environmental radiation 8,9) . The Japanese Government decided to begin decontamination work to lower the radiation exposure to those residing in Fukushima and to bring a sooner end to the evacuation zone 10) .…”

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Risk and preventive factors for heat illness in radiation decontamination workers after the Fukushima Daiichi Nuclear Power Plant accident

Kakamu

Hidaka

Hayakawa

et al. 2015

Journal of Occupational Health

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Risk and preventive factors for heat illness in radiation decontamination workers after the Fukushima Daiichi Nuclear Power Plant accident: Takeyasu Kakamu, et al. Department of Hygiene and Preventive Medicine, Fukushima Medical University School of Medicine Objective The aim of this study was to reveal factors related to heat illness in radiation decontamination workers and determine effective preventive measures. Methods A self‐administered questionnaire was sent to 1,505 radiation decontamination workers. The questionnaire included age, sex, duration of decontamination work, previous occupation, education provided by employers regarding heat illness, preventive action against heat illness, and subjective symptoms of heat illness during work. We included 528 men, who replied and answered all questions, in the statistical analysis. Subjective symptoms of heat illness were categorized as “no symptoms”, “Grade I” and “Grade II” according to severity. A multiple linear regression model was used to determine the factors associated with the severity of heat illness. Results The mean age of the subjects was 47.6 years old (standard deviation: 13.4). Of the 528 workers, 316 (59.8%) experienced heat illness symptoms (213 at Grade I and 103 at Grade II). The results of the stepwise selection revealed that age, outdoor manual labor, adequate sleep, use of a cool vest, and salt intake were selected as preventive factors, whereas living in a company dormitory or temporary housing, wearing light clothing, and consuming breakfast were selected as risk factors for heat illness. Conclusions Both working conditions and living environment are associated with heat illness in radiation decontamination workers. Type of housing and sleep are also strongly related to heat illness during work. Employers should consider not only the working conditions of the employee but also the employee's daily living conditions, in order to prevent heat illness.

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“…Because we have little experience with drastic widespread changes in LULC, we must examine how these changes influence the surrounding environment. After the disaster, many researchers used a variety of simulation models to simulate the diffusion or migration of radioactive materials, such as 131 I and 137 Cs18192930. These simulations used LULC map information as input data, and there is a possibility that the calculation results were influenced by changing ground surface conditions.…”

Section: Resultsmentioning

confidence: 99%

Land cover changes induced by the great east Japan earthquake in 2011

Ishihara

Tadono

2017

Sci Rep

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The east Japan earthquake that occurred on March 11, 2011 was a big natural disaster, comprising the large earthquake shock, tsunami, and Fukushima Daiichi Nuclear Power Plant (FDNPP) accident. These disasters caused changes in the land use and land cover (LULC) in Japan’s Tohoku district. While the LULC map created before the disaster is available, as yet there is no precise LULC map of the district after the disaster. In this study, we created a precise LULC map for the years 2013–2015 post-disaster with 30-m spatial resolution using the Landsat-8 with the Operational Land Imager (OLI) to evaluate the changes in LULC induced by the disaster. Our results indicate many changes in areas categorized as rice paddies primarily into grass categories along the coast damaged by the tsunami and in the evacuation zone around the FDNPP. Since there is a possibility of future LULC changes according to the change of the evacuation zone and implementation of reconstruction and revitalization efforts, we recommend continual monitoring of the changes in LULC by the use of satellite data in order to evaluate the long-term effects of the disaster.

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A GIS-based evaluation of the effect of decontamination on effective doses due to long-term external exposures in Fukushima

Cited by 28 publications

References 7 publications

Estimated Dietary Intake of Radionuclides and Health Risks for the Citizens of Fukushima City, Tokyo, and Osaka after the 2011 Nuclear Accident

Estimated Dietary Intake of Radionuclides and Health Risks for the Citizens of Fukushima City, Tokyo, and Osaka after the 2011 Nuclear Accident

Risk and preventive factors for heat illness in radiation decontamination workers after the Fukushima Daiichi Nuclear Power Plant accident

Land cover changes induced by the great east Japan earthquake in 2011

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