ABSTRACT

After the accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP), the Nuclear Regulation Authority (NRA) has adopted measures based on radiation monitoring in residential areas, instead of making decisions based on predictive radioactive material diffusion to protect residents in emergency preparedness and response. Protective actions such as sheltering and evacuation based on the measured radiation levels have been defined in each municipality where a nuclear facility is locating, but the measures to be taken when radioactive materials arrive from a neighboring country have not been discussed. We employed historical data of environmental γ-ray dose rate in 20 cities for more than 60 years, stored in the Environmental Radiation Database. In order to identify the abnormal signal from radiation emergency at neighboring country, we propose a new peak detection, detrended fluctuation analysis with the centered moving average, with real-time systematic analysis by checking the changes in radiation levels at multiple or all residential areas. Finally, we discuss a radiation monitoring strategy for taking protective actions for the local population.

摘要

福岛第一核电站（FDNPP）事故发生后，核监管局（NRA）采取了基于居民区辐射监测的措施，而不是基于预测性放射性物质扩散的决策，以保护居民的应急准备和响应. 核设施所在的每个城市都已经确定了基于测得的辐射水平的掩蔽和疏散等保护行动，但尚未讨论放射性物质从邻国运抵时应采取的措施。我们使用了 20 个城市 60 多年的环境 γ 射线剂量率历史数据，存储在环境辐射数据库中。为识别邻国辐射应急异常信号，我们提出了一种新的峰值检测，使用居中移动平均线进行去趋势波动分析，通过检查多个或所有住宅区的辐射水平变化进行实时系统分析。最后，我们讨论了为当地居民采取保护行动的辐射监测策略。