Radiation doses among residents living 37 km northwest of the Fukushima Dai-ichi Nuclear Power Plant

Kamada, Nanao; Saitô, Osamu; Endo, Satoru; Kimura, Akirou; Shizuma, Kiyoshi

doi:10.1016/j.jenvrad.2012.02.007

Cited by 47 publications

(27 citation statements)

References 8 publications

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“…IAEA reported that core damage occurring in Unit-2 was 30%. From Table 6, the associated dose is 99.1 mSv [14]. In the same manner, for Unit 3 the core damage fraction was 25% for 92.2 mSv (Table 6 and Fig.…”

Section: Fission Product Dispersion and Radiation Dose In The Environsupporting

confidence: 52%

“…2 for real-time measured dose of 385 to 400 mSv, the core damage for Unit 1 was estimated to range from 50% to 70%. IAEA reported that core damage fraction in Unit 1 was 70% on the b sis of the measured dose of approximately 400 mSv [6,8,14]. It indicates that the backward method in this paper can estimate the core damage fraction and the severity of accident.…”

Section: Fission Product Dispersion and Radiation Dose In The Environmentioning

confidence: 79%

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A Backward Method to Estimate the Dai-ichi Reactor Core Damage Using Radiation Exposure in the Environment

2016

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The Fukushima accident resulted in the melting of the reactor core due to loss of supply of coolant when the reactor stopped from operating conditions. The earthquake and tsunami caused loss of electricity due to the flooding that occurred in the reactor. The absence of the coolant supply after reactor shutdown resulted in heat accumulation, causing the temperature of the fuel to rise beyond its melting point. In the early stages of the accident, operator could not determine the severity of the accident and the percentage of the reactor core damaged. The available data was based on the radiation exposure in the environment that was reported by the authorities. The aim of this paper is to determine the severity of the conditions in the reactor core based on the radiation doses measured in the environment. The method is performed by backward counting based on the measuring radiation exposure and radionuclides releases source term. The calculation was performed by using the PC-COSYMA code. The results showed that the core damage fraction at Dai-ichi Unit 1 was 70%, and the resulting individual effective dose in the exclusion area is 401 mSv, while the core damage fraction at Unit 2 was 30%, and the resulting individual effective dose was 99.1 mSv, while for Unit 3, the core damage fraction was 25% for an individual effective dose of 92.2 mSv. The differences between the results of the calculation for estimation of core damage proposed in this paper with the previously reported results is probably caused by the applied model for assessment, differences in postulations and assumptions, and the incompleteness of the input data. This difference could be reduced by performing calculations and simulations for more varied assumptions and postulations.

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Section: Fission Product Dispersion and Radiation Dose In The Environsupporting

confidence: 52%

Section: Fission Product Dispersion and Radiation Dose In The Environmentioning

confidence: 79%

A Backward Method to Estimate the Dai-ichi Reactor Core Damage Using Radiation Exposure in the Environment

2016

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“…), the announcement of the accident and the ensuing alarm, exacerbated by consumption prohibitions, mean that local products were probably not consumed on a regular basis (Taira et al, 2012). However, dose reconstructions for people who were in these areas, based on urine samples, show that local foodstuffs were occasionally consumed during this period (Kamada et al, 2012).…”

Section: Ingestion Dose Estimates Related To the First Month After Thmentioning

confidence: 99%

“…These doses are to be compared with those reconstructed by Kamada et al (2012): from 27 to 66 mSv for 4 adults and one 14-year-old child living in Iitate-Mura and Kawamata-Machi. The urine was sampled on May 5th (54 days after deposition).…”

Section: Ingestion Dose Estimates Related To the First Month After Thmentioning

confidence: 99%

Contamination of Japanese foodstuffs of terrestrial origin after the Fukushima nuclear accident and related dose assessment

et al. 2013

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-This article proposes an assessment of the ingestion doses potentially received by people living in the Japanese areas most severely affected by the radioactive deposits due to the Fukushima nuclear accident. The assessment distinguishes two consecutive periods: the first 2 months (March 15th to May 15th 2011) and the rest of the year 2011, according to the two main foodstuff contamination periods identified (Renaud et al., 2013). On the basis of the worstcase hypothesis that can reasonably be made, the estimated doses are much lower than they might have been in other circumstances, on account of generally moderate levels of contamination for most foods, early evacuation of the most severely affected areas and the consumption bans ordered by the Japanese authorities. Thus, a single ingestion of 100 g of leafy vegetables in the early days by a one-year-old child living in non-evacuated localities near Iitate and Kawamata could have led to an equivalent dose to the thyroid of about 25 mSv; and to a thyroid dose of about 140 mSv for the rather unrealistic scenario of a daily consumption. Because of the rapid decrease in the contamination of vegetables and a much weaker contamination of other crops, and thanks to measures taken by the authorities (prohibition of consumption, use of certain fodder, etc.), the ingestion doses potentially received during the remainder of the year 2011 are estimated to be below 1 mSv. In the event that sales limits would have been ignored, only repeated consumption of mushrooms would have led to doses above that level. Even with the worst-case hypotheses, the doses potentially caused by ingestion are much lower than those resulting from outdoor exposure to radioactive deposits: approximately several millisieverts in a year for the population living in the non-evacuated localities near Iitate and Kawamata.

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“…Neither human nor environmental measurements could be adequately performed shortly after the accident. According to the published research [3][4][5][6], only around 1,300 human measurements were performed within the first two month after the accident. Extensive direct (in vivo) measurements using whole-body counters (WBCs) were started in late June, 2011 [7,8]; however, 131 I could not have been detected at this point of time.…”

Section: Introductionmentioning

confidence: 99%

Development of a tool for calculating early internal doses in the Fukushima Daiichi nuclear power plant accident based on atmospheric dispersion simulation

et al. 2017

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Abstract.A tool was developed to facilitate the calculation of the early internal doses to residents involved in the Fukushima Nuclear Disaster based on atmospheric transport and dispersion model (ATDM) simulations performed using Worldwide version of System for Prediction of Environmental Emergency Information 2nd version (WSPEEDI-II) together with personal behavior data containing the history of the whereabouts of individul's after the accident. The tool generates hourly-averaged air concentration data for the simulation grids nearest to an individual's whereabouts using WSPEEDI-II datasets for the subsequent calculation of internal doses due to inhalation. This paper presents an overview of the developed tool and provides tentative comparisons between direct measurement-based and ATDM-based results regarding the internal doses received by 421 persons from whom personal behavior data available.

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Radiation doses among residents living 37 km northwest of the Fukushima Dai-ichi Nuclear Power Plant

Cited by 47 publications

References 8 publications

A Backward Method to Estimate the Dai-ichi Reactor Core Damage Using Radiation Exposure in the Environment

A Backward Method to Estimate the Dai-ichi Reactor Core Damage Using Radiation Exposure in the Environment

Contamination of Japanese foodstuffs of terrestrial origin after the Fukushima nuclear accident and related dose assessment

Development of a tool for calculating early internal doses in the Fukushima Daiichi nuclear power plant accident based on atmospheric dispersion simulation

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