137Cs Trapped by Biomass within 20 km of the Fukushima Daiichi Nuclear Power Plant

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• 作者：Akio Koizumi ; Tamon Niisoe ; Kouji H. Harada ; Yukiko Fujii ; Ayumu Adachi ; Toshiaki Hitomi ; Hirohiko Ishikawa
• 刊名：Environmental Science & Technology
• 出版年：2013
• 出版时间：September 3, 2013
• 年：2013
• 卷：47
• 期：17
• 页码：9612-9618
• 全文大小：353K
• 年卷期：v.47,no.17(September 3, 2013)
• ISSN：1520-5851

文摘

Analysis of ¹³⁷Cs trapped in biomass in highly contaminated zones is crucial in predicting the long-term fate of ¹³⁷Cs following the explosion at the Fukushima Daiichi Nuclear Power Plant. We surveyed forest 20鈥?0 km from the plant in July and September 2011 to evaluate ¹³⁷Cs trapped in biomass within 20 km of the plant. We determined the ambient dose rate and collected forest soils and twigs at 150 sampling points. Removability from the canopy was evaluated by washing leaves and branches with water and organic solvents. The biomass of the forest canopy was then calculated. ¹³⁷Cs fallout was simulated with an atmospheric transport model. The modeled dose rate agreed with observations (n = 24) (r = 0.62; p < 0.01). Washing experiments demonstrated that unremovable portions accounted for 53.9 卤 6.4% of ¹³⁷Cs trapped by deciduous canopy (n = 4) and 59.3 卤 13.8% of ¹³⁷Cs trapped by evergreen canopy (n = 10). In total, it was estimated that 74.5 脳 10¹² Bq was trapped by canopy in the forest within the no-go zone, with 44.2 脳 10¹² Bq allocated to unremovable portions, and that 0.86% of the total release was trapped in biomass as of September 2011.