Estimation of internal exposure of the thyroid to 131I on the basis of 134Cs accumulated in the body among evacuees of the Fukushima Daiichi Nuclear Power Station accident

Hosoda, Masahiro; Tokonami, Shinji; Akiba, Suminori; Kurihara, Osamu; Ishikawa, Tetsuo; Momose, Takumaro; Nakano, Takashi; Mariya, Yasushi; Kashiwakura, Ikuo

doi:10.1016/j.envint.2013.09.013

Cited by 41 publications

(18 citation statements)

References 18 publications

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“…The production and decay scheme of 90 Sr is as follow [3]: 90 Kr ÀÀÀÀÀ ÀÀ! Many scientific papers have been published related to the Fukushima accident mainly focusing on gamma emitter radionuclides such as iodine, tellurium and cesium isotopes [4][5][6][7][8][9] while the number of papers on 90 Sr are much fewer [10][11][12]. The main reason of this difference is rooted in the applied measurement methods.…”

Section: Introductionmentioning

confidence: 98%

Measurement of 90Sr in soil samples affected by the Fukushima Daiichi Nuclear Power Plant accident

Kávási¹,

Sahoo²,

Tokonami

et al. 2014

J Radioanal Nucl Chem

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90 Sr activity concentration was measured in four soil samples (0-10 cm) collected from the exclusion zone around the Fukushima Daiichi Nuclear Power Plant.The open chemical digestion method was used for sample decomposition with a mixture of acids. The strontium separation was achieved with strontium selective resin (Srresin). The activity of 90 Sr was determined with liquid scintillation counter. Owing to the atmospheric nuclear weapon tests, the soil in Japan is contaminated with 90 Sr. Significant Fukushima contamination was not noticed by the results of this study due to background level. The detected 90 Sr activities were 8.9 ± 0.8, 20 ± 1.3, \6.8, and 23.4 ± 1.5 Bq kg -1 , respectively.

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Section: Introductionmentioning

confidence: 98%

Measurement of 90Sr in soil samples affected by the Fukushima Daiichi Nuclear Power Plant accident

Kávási¹,

Sahoo²,

Tokonami

et al. 2014

J Radioanal Nucl Chem

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“…Large amounts of artificial radionuclides such as radioiodine and radiocesium were released by the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident in March 2011 [1]. Namie is located in the northern part of Fukushima Prefecture in Japan, and its population was around 21,000 when the Great East Japan earthquake struck.…”

Section: Introductionmentioning

confidence: 99%

Whole-Body Counter(WBC) and food radiocesium contamination surveys in Namie, Fukushima Prefecture

et al. 2017

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PurposeThis study examined the internal Cs exposure of residents and the Cs present in food products produced in Namie. Whole-body counter (WBC) was used for the measurement of internal exposure per each whole body of examinees.MethodsThe food products which appeared to be used for consumption, were brought by residents and commercially available food items were excluded. Most of them were wild plants or food items produced by residents. Four years of data from April 2012 to March 2013 (fiscal 2012) and April 2015 to March 2016 (Fiscal 2015) were analyzed and studied.ResultsThe average radioactivity measured by WBC was approximately 5 Bq for Cs-134, and 20 Bq for Cs-137 and the average committed effective dose was approximately 1 μSv. The average for the residents with detectable radioactivity was 25 μSv, and the human health effects are considered to be extremely low risk. However, the radioactivity of the affected individuals showed a higher value than the theoretical attenuation rate. The majority (83.2%) of individuals exhibiting radioactivity were over 50 years old. The number of food products brought in for detection decreased as the study period progressed, but the number of food products with radioactivity had increased. While the items with a higher detection rate of radioactivity included fruits such as citron and persimmon, shiitake mushrooms exhibited the highest radioactivity. Moreover, the radioactivity of seven items in these 10 items decreased from fiscal 2012 to fiscal 2015. Mushrooms had high radioactivity and were produced over a wide area.ConclusionWe suggest that the elderly try to enjoy life and eat wild plants in moderation while inspecting food products. Therefore, we will continue to work in raising awareness of radiation and its potential presence in food products and thus the continuing necessity of monitoring radioactivity in food in the future.

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“…The estimate for 1-year-old children was 30 mSv as the 90 th percentile value for the relatively high dose areas. A similar approach to this was also attempted for Namie town's residents by Hosoda et al [20] and Kim et al [21], resulting in a large discrepancy in the derived intake ratio of 131 I/ 134 Cs: 0.1-0.9 (a geometric mean, 0.2) and 3-5 (average, 3.8), respectively.…”

Section: Estimation From Direct Measurements For Cesiummentioning

confidence: 90%

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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Estimation of internal exposure of the thyroid to 131I on the basis of 134Cs accumulated in the body among evacuees of the Fukushima Daiichi Nuclear Power Station accident

Cited by 41 publications

References 18 publications

Measurement of 90Sr in soil samples affected by the Fukushima Daiichi Nuclear Power Plant accident

Measurement of 90Sr in soil samples affected by the Fukushima Daiichi Nuclear Power Plant accident

Whole-Body Counter(WBC) and food radiocesium contamination surveys in Namie, Fukushima Prefecture

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

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