131i Dose Estimation From Intake of Tap Water in the Early Phase After Fukushima Daiichi Nuclear Power Plant Accident

Kawai, Masaki; Yoshizawa, Nobuaki; Suzuki, Gen

doi:10.1093/rpd/ncx208

Cited by 12 publications

(5 citation statements)

References 5 publications

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“…Other researchers have used ATDM simulations for a similar purpose. Kawai et al (2018) and Miyatake et al (2020) attempted to reconstruct a time-series profile of the 131 I concentration in tap water available in the areas of concern after the FDNPP accident with the help of ATDM simulations by WSPEEDI-II to estimate the ingestion dose. Ohba et al (2020) and Takagi et al (2020) estimated the internal thyroid doses due to the inhalation of 131 I by using the latest ATDM simulations available.…”

Section: Discussionmentioning

confidence: 99%

Estimation of the Early Cs-137 Intake of Evacuees from Areas Affected by the 2011 Fukushima Daiichi Nuclear Power Plant Accident Based on Personal Behavioral Data and the Latest Atmospheric Transport and Dispersion Model Simulation

et al. 2021

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More than nine years have passed since the 2011 nuclear disaster in Fukushima Prefecture, 2 Japan. During this period, much effort has been made on the dose reconstruction for Fukushima 3 residents; however, the estimation of the internal dose due to the potential intake of the short-4 lived radionuclides (mainly, 131 I) has been challenging because of the lack of direct human 5 measurements at the early phase of the accident. Our previous study revealed that the residual 6 cesium body contents observed in delayed whole-body counter (WBC) measurements of 7 residents from Namie-town, one of the most affected municipalities), varied greatly with the 8 timepoint of their evacuations on 12 March 2011 when the first explosive event occurred at the 9 accident site; i.e., the late evacuees had much higher residual Cs body contents compared to the 10 prompt evacuees. The present study thus aimed to clarify this finding by reproducing the 11 exposure situation based on the evacuees' personal behavioral data in combination with the 12 latest atmospheric transport and dispersion model (ATDM) simulation for 356 selected subjects 13 in adult and 15-year (13-17 yrs) age groups. The results demonstrated that the ATDM 14 simulation-based method could reasonably reproduce the subjects' exposure situation, 15supporting the previous finding. However, the residual 137 Cs body contents calculated by this 16 method were only 10%-20% of those in the subjects' WBC measurements. This large 17 discrepancy was considered to be caused by both the present method's underestimation and the 18 overestimation of the subjects' early intake in the WBC measurements due to a conservative 19 intake scenario not assuming potential additional intake. Additional studies are needed to 20 further clarify the reasons for the discrepancy and to evaluate the magnitude of the inhalation

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Section: Discussionmentioning

confidence: 99%

Estimation of the Early Cs-137 Intake of Evacuees from Areas Affected by the 2011 Fukushima Daiichi Nuclear Power Plant Accident Based on Personal Behavioral Data and the Latest Atmospheric Transport and Dispersion Model Simulation

et al. 2021

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“…Overall, the uncertainty of the present method using the ATDM simulation could be considerably large at the individual level. Nevertheless, the present dose estimation would be useful for the evaluation of radiation doses due to the ingestion of contaminated food and drink items (Kawai et al 2018;Miyatake et al 2020) because the individual doses from direct human measurements should include the dose contributions from both inhalation and ingestion. Finally, the thyroid dose coefficients for Japanese populations should be examined as an additional issue in future studies.…”

Section: Discussionmentioning

confidence: 99%

Estimation of the Thyroid Equivalent Doses to Residents in Areas Affected by the 2011 Fukushima Nuclear Disaster Due to Inhalation of 131I Based on Their Behavioral Data and the Latest Atmospheric Transport and Dispersion Model Simulation

et al. 2022

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It has been challenging to obtain reliable estimates of thyroid equivalent doses (TEDs) to residents involved in the 11 March 2011 Fukushima Daiichi Nuclear Power Plant (FDNPP) accident because of the shortage of direct human measurements associated with 131 I, the largest contributor to the dose of concern. The present study attempted to perform the estimation of the TEDs by inhalation of 131 I to residents from Namie-town, one of the most radiologically-affected municipalities, by means of the latest atmospheric transport and dispersion model (ATDM) simulations with the Worldwide version of System for Prediction of Environmental Emergency Dose Information (WSPEEDI) ver. 2, coupled with personal behavioral data containing the history of the whereabouts of individuals shortly after the accident. We analyzed 1,637 residents who underwent direct measurements with whole-body counters several months after the accident and provided their personal behavioral data. We divided the subjects into two groups based on whether the distances between their locations and the FDNPP were >20 km as of 15:00 on 12 March in relation to the timepoint of the hydrogen explosion at the Unit 1 Reactor building. As a result, the 90th percentile TEDs of the 1,249 prompt evacuees and 388 late evacuees were 3.9 mSv (adult)-6.8 mSv (10-y-old) and 24.1 mSv (adult)-35.6 mSv (5-y-old), respectively, excluding 16 persons whose TEDs exceeded 50 mSv. The 90th percentile (median) TEDs to 1-y-old children (not included in the subjects) for the prompt and late evacuation groups were 8.1 (1.0) mSv and 36.3 (19.7) mSv, respectively. Additionally, this study provided the evidence to support the view that the explosive event at the Unit 1 Reactor building on the afternoon of 12 March 2011 could have caused the critical group among Namie-town's residents, whereas the largest release event on 15 March gave relatively small doses to the residents because their exposure took place mostly at sites that were distant from the FDNPP. However, the present dose estimation has potentially large uncertainty at the individual level; further validations are thus necessary.

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“…The recent dose estimations by Ohba et al [30] and Kawai et al [28] are provided for the inhalation dose and the ingestion dose, respectively. The sum of these two dose estimates was also mostly less than 20 mSv (at the 90 th percentile level) for the municipalities near the FDNPP.…”

Section: Discussionmentioning

confidence: 99%

“…By contrast, Murakami and Oki [27] estimated the thyroid doses from ingestion taking into account the effects of countermeasures (as in the Case 1 scenario): 1.7 mSv ( < 1 year), 2.1 mSv (7-12 years, male), and 0.84 mSv ( ≥ 19 years, male) for citizens in Fukushima city. Kawai et al [28] also reported the thyroid doses from the ingestion of tap water based on realistic intake scenarios with reconstructed time trend profiles of the 131 I radioactivity concentration.…”

Section: Estimation From Other Sourcesmentioning

confidence: 99%

Thyroid Doses in Children from Radioiodine following the Accident at the Fukushima Daiichi Nuclear Power Plant

Kim¹,

Kurihara²

2020

J Radiat Prot Res

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Background: Huge amounts of radionuclides were released into the environment due to the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident, which caused not only serious contamination on the ground, but also radiation exposure to the public. One problem that remains in performing the dose estimation is the difficulty of estimating the internal thyroid dose due to the intake of radioiodine (mainly, 131 I) because of limitations to the human data available. Materials and Methods:The relevant papers were collected and reviewed by the authors. The results of thyroid dose estimates from different studies were tabulated for comparison. Results and Discussion:The thyroid dose estimates from the studies varied widely. The dose estimates by the United Nations Scientific Committee on the Effects of Atomic Radiation were higher than the others due to the ingestion dose being based on conservative assumptions. The dose estimates by Japanese experts were mostly below 20-30 mSv. The recent studies suggested that exposure on March 12, 2011 would be crucial for late evacuees from the areas near the FD-NPP because of the possible intake of short-lived radionuclides other than 131 I. Further multilateral studies are vital to reduce uncertainties in the present dose estimations. Conclusion:The estimation of the thyroid doses to Fukushima residents still has many uncertainties. However, it is considered unlikely that the thyroid doses exceeded 50 mSv except in some extreme cases. Further multilateral studies are thus necessary to reduce the uncertainties in the present dose estimations.

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131i Dose Estimation From Intake of Tap Water in the Early Phase After Fukushima Daiichi Nuclear Power Plant Accident

Cited by 12 publications

References 5 publications

Estimation of the Early Cs-137 Intake of Evacuees from Areas Affected by the 2011 Fukushima Daiichi Nuclear Power Plant Accident Based on Personal Behavioral Data and the Latest Atmospheric Transport and Dispersion Model Simulation

Estimation of the Early Cs-137 Intake of Evacuees from Areas Affected by the 2011 Fukushima Daiichi Nuclear Power Plant Accident Based on Personal Behavioral Data and the Latest Atmospheric Transport and Dispersion Model Simulation

Estimation of the Thyroid Equivalent Doses to Residents in Areas Affected by the 2011 Fukushima Nuclear Disaster Due to Inhalation of 131I Based on Their Behavioral Data and the Latest Atmospheric Transport and Dispersion Model Simulation

Thyroid Doses in Children from Radioiodine following the Accident at the Fukushima Daiichi Nuclear Power Plant

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