Earticle

초록

영어

Background: The radionuclides released by the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident 9 years ago are still being monitored by various research teams and the Japanese government. Comparison of different surveys’ results could help evaluate the exposure doses and the mechanism of radiocesium behavior in the urban environment in the area. In this study, we clarified the relationship between land use and temporal changes in the ambient dose rates (air dose rates) using big data. Materials and Methods: We set a series of 1 × 1 km2 meshes within the 80 km zone of the FDNPP to compare the different survey results. We then prepared an analysis dataset from all survey meshes to analyze the temporal change in the air dose rate. The selected meshes included data from all survey types (airborne, fixed point, backpack, and carborne) obtained through the all-time survey campaigns. Results and Discussion: The characteristics of each survey’s results were then evaluated using this dataset, as they depended on the measurement object. The dataset analysis revealed that, for example, the results of the carborne survey were smaller than those of the other surveys because the field of view of the carborne survey was limited to paved roads. The location factor of different land uses was also evaluated considering the characteristics of the four survey methods. Nine years after the FDNPP accident, the location factor ranged from 0.26 to 0.49, while the half-life of the air dose rate ranged from 1.2 to 1.6. Conclusion: We found that the decreasing trend in the air dose rate of the FDNPP accident was similar to the results obtained after the Chernobyl accident. These parameters will be useful for the prediction of the future exposure dose at the post-accident.

목차

ABSTRACT
Introduction
Materials and Methods
1. National Project
2. Measurement Tools
3. Analysis Dataset
4. Comparison of the Survey Methods
5. Evaluation of the Location Factors
Results and Discussion
1. Comparison of the Survey Methods
2. Location Factor
Conclusion
Conflict of Interest
Acknowledgements
Author Contribution
Supplementary Materials
References
Supplementary Materials

키워드

저자

• Yukihisa Sanada [ Sector of Fukushima Research and Development, Japan Atomic Energy Agency, Fukushima, Japan ] Corresponding Author
• Mutsushi Ishida [ NESI Inc., Ibaraki, Japan ]
• Kazuya Yoshimura [ Sector of Fukushima Research and Development, Japan Atomic Energy Agency, Fukushima, Japan ]
• Satoshi Mikami [ Nuclear Emergency Assistance and Training Center, Japan Atomic Energy Agency, Ibaraki, Japan ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  방사선방어학회지 [Journal of Radiation Protection and Research]

• 간기

  계간

• pISSN

  2508-1888

• 수록기간

  1976~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 559 DDC 629