1. Inversion of
- Author
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Sheng, Fang, Xinwen, Dong, Shuhan, Zhuang, Zhijie, Tian, Yungang, Zhao, Yun, Liu, Yuanyuan, Liu, and Li, Sheng
- Subjects
Japan ,Air Pollutants, Radioactive ,Radiation Monitoring ,Cesium Radioisotopes ,Fukushima Nuclear Accident - Abstract
Temporal absences in observation records lead to release losses during the source term inversions of atmospheric radionuclide emissions. Consequently, objectively-estimated source terms for the Fukushima accident contain fewer release details and present large discrepancies when compared with the expert-judged one. This paper describes an objective method that can adaptively recover the missing releases caused by the temporal absences of observations. The proposed method assumes that the accident releases of radionuclides are piecewise-constant and comprise both peaks and constant releases. The missing releases are adaptively recovered as either peaks or constant releases by minimizing the total variation of the estimated source term. The proposed method is applied to the Fukushima accident and evaluated against regional airborne and deposited
- Published
- 2022