Initial decrease in the ambient dose equivalent rate after the Fukushima accident and its difference from Chernobyl
Initial decrease in the ambient dose equivalent rate after the Fukushima accident and its difference from Chernobyl
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福岛事故后环境剂量当量率的初始下降及其与切尔诺贝利事故的差异
DOI：
10.1038/s41598-020-60847-0
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发表时间：
2020
影响因子：
4.6
通讯作者：
Y. Sanada
中科院分区：
文献类型：
--
作者：
K. Yoshimura;J. Saegusa;Y. Sanada
2011年，在福岛第一核电站事故后，利用2011年3月16日的监测数据，研究了有效剂量的替代量--环境剂量当量率（dH*（10）dt−1）的初期下降。dH*（10）dt−1通过每单位面积的137 Cs活度（norm-dH*（10）dt−1）进行归一化，以分析具有不同沉积水平的监测点的数据。norm-dH*（10）dt−1在前60天内迅速下降，随后缓慢下降，并使用两个指数函数建模。在铺砌路面和建筑物占主导地位的地区获得的norm-dH*（10）dt−1比未铺砌占主导地位的地区下降得更快，与疏散区相比，居民区的下降更快。将norm-dH*（10）dt−1的下降与使用切尔诺贝利核电站事故后在欧洲获得的参数的模拟结果进行了比较，这些参数表示由于放射性核素迁移而下降（例如，土壤渗透和水平冲刷）。模拟结果显示，放射性铯的减少速度比我们的结果快，这意味着福岛的放射性铯迁移比欧洲少。结果还表明，降低率的区域差异导致外部剂量估计的不确定性。
In 2011, after the Fukushima Dai-ichi Nuclear Power Plant accident, the initial decrease in the ambient dose equivalent rate (dH*(10) dt−1), an alternative quantity to the effective dose, was studied using monitoring data obtained from March 16, 2011. The dH*(10) dt−1 was normalized by the 137Cs activity per unit area (norm-dH*(10) dt−1) to analyze the data across monitoring sites with different deposition levels. The norm-dH*(10) dt−1 showed a rapid decrease during the first 60 days, followed by slow decrease and was modeled using two exponential functions. The norm-dH*(10) dt−1 obtained in areas dominated by paved surfaces and buildings showed a faster decrease than the unpaved-dominant field, and this decrease was facilitated in residential areas compared with the evacuation zone. The decrease in norm-dH*(10) dt−1 was compared with simulation results using parameters obtained in Europe after the Chernobyl Nuclear Power Plant accident that represent a decrease due to radionuclide migration (e.g., soil penetration and horizontal wash-off). The simulation results showed a faster decrease than our results, implying that there was less radiocesium migration in Fukushima than in Europe. The results also suggested that the regional variation in the decrease rate led to uncertainty regarding the external dose estimation.
DOI：
--
发表时间：
2014
期刊：
影响因子：
--
作者：
Naoki Nishimoto;Mizuki Ohta;Katsuhiko Ogasawara
通讯作者：
Katsuhiko Ogasawara
影响因子：
11.4
作者：
Taniguchi, Keisuke;Onda, Yuichi;Saito, Kimiaki
通讯作者：
Saito, Kimiaki