ENHANCED ANALYSIS METHODS TO DERIVE THE SPATIAL DISTRIBUTION OF 131I DEPOSITION ON THE GROUND BY AIRBORNE SURVEYS AT AN EARLY STAGE AFTER THE FUKUSHIMA DAIICHI NUCLEAR POWER PLANT ACCIDENT
ENHANCED ANALYSIS METHODS TO DERIVE THE SPATIAL DISTRIBUTION OF 131I DEPOSITION ON THE GROUND BY AIRBORNE SURVEYS AT AN EARLY STAGE AFTER THE FUKUSHIMA DAIICHI NUCLEAR POWER PLANT ACCIDENT
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DOI：
10.1097/hp.0b013e318294444e
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发表时间：
2013-08-01
期刊：
影响因子：
2.2
通讯作者：
Blumenthal, Daniel J.
中科院分区：
文献类型：
--
作者：
Torii, Tatsuo;Sugita, Takeshi;Blumenthal, Daniel J.
本文将新的且经过充分测试的分析方法应用于航空放射测量，以提取 2011 年 3 月福岛第一核电站 (NPP) 事故后存在的 I-131 地面浓度。该分析提供了 I-131 沉积的完整图谱，由于 I-131 的半衰期短且分析复杂，这一重要数量在事故发生时无法计算。 I-131 沉积图是进行内照射评估、人群剂量重建和后续流行病学研究的第一步。 I-131 的半衰期较短，因此需要使用航空放射勘测来快速、彻底、安全地覆盖大面积区域。美国能源部国家核安全管理局 (DOE/NNSA) 的团队进行了航空放射性调查，以提供日本放射性物质扩散的初步地图。这项工作报告了日美联合合作对初始调查数据的子集进行的分析，以确定 I-131 地面浓度。分析结果显示，核电站西北部存在高浓度的 I-131，与之前报道的放射性铯沉积一致，但也显示核电站南部存在显着的 I-131 浓度，这在原始铯分析中未观察到。放射性碘和铯模式的差异可能是这些材料从空气中沉降的方式不同的结果。
This paper applies both new and well tested analysis methods to aerial radiological surveys to extract the I-131 ground concentrations present after the March 2011 Fukushima Daiichi nuclear power plant (NPP) accident. The analysis provides a complete map of I-131 deposition, an important quantity incalculable at the time of the accident due to the short half-life of I-131 and the complexity of the analysis. A map of I-131 deposition is the first step in conducting internal exposure assessments, population dose reconstruction, and follow-up epidemiological studies. The short half-life of I-131 necessitates the use of aerial radiological surveys to cover the large area quickly, thoroughly, and safely. Teams from the U. S. Department of Energy National Nuclear Security Administration (DOE/NNSA) performed aerial radiological surveys to provide initial maps of the dispersal of radioactive material in Japan. This work reports on analyses performed on a subset of the initial survey data by a joint Japan-U.S. collaboration to determine I-131 ground concentrations. The analytical results show a high concentration of I-131 northwest of the NPP, consistent with the previously reported radioactive cesium deposition, but also shows a significant I-131 concentration south of the plant, which was not observed in the original cesium analysis. The difference in the radioactive iodine and cesium patterns is possibly the result of differences in the ways these materials settle out of the air.