Reconstruction of residents' thyroid equivalent doses from internal radionuclides after the Fukushima Daiichi nuclear power station accident
Reconstruction of residents' thyroid equivalent doses from internal radionuclides after the Fukushima Daiichi nuclear power station accident
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DOI：
10.1038/s41598-020-60453-0
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发表时间：
2020-02-27
影响因子：
4.6
通讯作者：
Suzuki, Gen
中科院分区：
文献类型：
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作者：
Ohba, Takashi;Ishikawa, Tetsuo;Suzuki, Gen
福岛第一核电站（FDNPS）事故发生后，居民们担心他们的孩子在不久的将来可能患上甲状腺癌。然而，甲状腺当量剂量的人口和地理分布没有得到彻底评价，仅对1 200名儿童进行了直接甲状腺测量，其个人甲状腺剂量是根据考虑放射性碘摄入动态的测量结果进行评估的。我们对疏散区内7个城市的儿童随机抽取的100或300份行为问卷进行了分层聚类分析，以重建与烟雾高或低暴露相关的疏散情景。利用大气扩散模拟建立的时空放射性核素浓度数据库，对福岛健康管理调查中的总共896项行为记录进行了分析，以估计通过吸入吸入的甲状腺当量剂量。在应用了用于遮蔽的去污因子和剂量系数的修正因子（以反映日本较低的碘吸收率）之后，估计的甲状腺当量剂量与直接甲状腺测量估计的剂量接近。1岁儿童甲状腺当量剂量的中位数和第95百分位数分别为0.6至16毫西弗和7.5至30毫西弗。这些结果对未来福岛甲状腺癌的流行病学研究是有益的。
There is concern among residents that their children might suffer from thyroid cancer in the near future after the Fukushima Daiichi nuclear power station (FDNPS) accident. However, the demographic and geographical distribution of thyroid equivalent doses was not thoroughly evaluated, and direct thyroid measurements were conducted only for 1,200 children, whose individual thyroid doses were assessed on the basis of those measurements accounting for the dynamics of radioiodine intake. We conducted hierarchical clustering analyses of 100 or 300 randomly sampled behavioural questionnaire sheets of children from each of seven municipalities in the evacuation area to reconstruct evacuation scenarios associated with high or low exposures to plumes. In total 896 behaviour records in the Fukushima Health Management Survey were analysed to estimate thyroid equivalent doses via inhalation, using a spatiotemporal radionuclides concentration database constructed by atmospheric dispersion simulations. After a decontamination factor for sheltering and a modifying factor for the dose coefficient-to reflect lower iodine uptake rate in Japanese-were applied, estimated thyroid equivalent doses were close to those estimated from direct thyroid measurement. The median and 95th percentile of thyroid equivalent doses of 1-year-old children ranged from 0.6 to 16 mSv and from 7.5 to 30 mSv, respectively. These results are useful for future epidemiological studies of thyroid cancer in Fukushima.