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Int. J. Environ. Res. Public Health 2017, 14(8), 926; doi:10.3390/ijerph14080926

Estimation of the Vertical Distribution of Radiocesium in Soil on the Basis of the Characteristics of Gamma-Ray Spectra Obtained via Aerial Radiation Monitoring Using an Unmanned Helicopter

1
Fukushima Environmental Safety Center, Japan Atomic Energy Agency, 45-169 Sukakeba, Kaibama-aza, Haramachi, Minamisoma, Fukushima 975-0036, Japan
2
NESI, Inc., 1-9-3, Saku-machi, Taira-aza, Iwaki, Fukushima 970-8026, Japan
3
Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
*
Author to whom correspondence should be addressed.
Received: 20 July 2017 / Revised: 8 August 2017 / Accepted: 12 August 2017 / Published: 17 August 2017
(This article belongs to the Section Environmental Engineering and Public Health)
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Abstract

After the Fukushima Daiichi Nuclear Power Plant accident, the vertical distribution of radiocesium in soil has been investigated to better understand the behavior of radiocesium in the environment. The typical method used for measuring the vertical distribution of radiocesium is troublesome because it requires collection and measurement of the activity of soil samples. In this study, we established a method of estimating the vertical distribution of radiocesium by focusing on the characteristics of gamma-ray spectra obtained via aerial radiation monitoring using an unmanned helicopter. The estimates are based on actual measurement data collected at an extended farm. In this method, the change in the ratio of direct gamma rays to scattered gamma rays at various depths in the soil was utilized to quantify the vertical distribution of radiocesium. The results show a positive correlation between the abovementioned and the actual vertical distributions of radiocesium measured in the soil samples. A vertical distribution map was created on the basis of this ratio using a simple equation derived from the abovementioned correlation. This technique can provide a novel approach for effective selection of high-priority areas that require decontamination. View Full-Text
Keywords: Fukushima Daiichi Nuclear Power Plant accident; aerial radiation monitoring; unmanned helicopter; radiocesium; vertical distribution Fukushima Daiichi Nuclear Power Plant accident; aerial radiation monitoring; unmanned helicopter; radiocesium; vertical distribution
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MDPI and ACS Style

Ochi, K.; Sasaki, M.; Ishida, M.; Hamamoto, S.; Nishimura, T.; Sanada, Y. Estimation of the Vertical Distribution of Radiocesium in Soil on the Basis of the Characteristics of Gamma-Ray Spectra Obtained via Aerial Radiation Monitoring Using an Unmanned Helicopter. Int. J. Environ. Res. Public Health 2017, 14, 926.

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