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Performance of in situ gamma-ray spectrometry in the assessment of radioactive cesium deposition around the Fukushima Daiichi nuclear power plant
Radiation Physics and Chemistry ( IF 2.9 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.radphyschem.2020.109205
Young-Yong Ji , Kotaro Ochi , Sang Bum Hong , Shigeo Nakama , Yukihisa Sanada , Satoshi Mikami

Abstract In situ gamma-ray spectrometry using diverse survey platforms has been conducted in contaminated areas with various dose rate levels around the Fukushima Daiichi nuclear power plant (FDNPP). Six survey sites, including two evacuation zones around the FDNPP, were selected for ground-based gamma-ray spectrometry using HPGe (high purity Ge) and LaBr3(Ce) detectors to assess the radioactive cesium deposition in the ground. Laboratory analysis of soil samples taken by depth from the sites was performed to evaluate the depth profile of radioactive cesium. The diverse levels of radioactivity of 137Cs were then distributed to six survey sites from 30 to 3000 kBq·m−2 in the measurement period of October 2018. Finally, a method to directly calculate the depth profile using in situ measurement was introduced so as to have representation over a wide area, and the results were successfully compared with those of sample analysis at one point in the site. Except for the sites with relatively high lateral inhomogeneity of radioactive cesium, about 30% difference between two depth profiling methods using samples and in situ measurement was shown in the calculated radioactivity of 134Cs and 137Cs in the ground.

中文翻译:

原位伽马能谱在福岛第一核电站周围放射性铯沉积评估中的性能

摘要 在福岛第一核电站 (FDNPP) 周围具有不同剂量率水平的污染区域中,已经使用各种调查平台进行了原位伽马射线能谱测量。六个调查地点,包括 FDNPP 周围的两个疏散区,被选择用于使用 HPGe(高纯度 Ge)和 LaBr3(Ce)探测器进行地基伽马射线光谱测定,以评估地下放射性铯沉积。对从现场深度采集的土壤样本进行了实验室分析,以评估放射性铯的深度剖面。然后在 2018 年 10 月的测量期间将 137Cs 的不同放射性水平分布到 6 个测量点,范围从 30 到 3000 kBq·m-2。最后,引入了一种利用原位测量直接计算深度剖面的方法,以便在大范围内具有代表性,并将结果与​​现场一个点的样品分析结果进行比较。除放射性铯横向不均匀性较高的地点外,通过样品和原位测量两种深度剖面方法计算的134Cs和137Cs在地下的放射性有30%左右的差异。
更新日期:2021-02-01
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