Radiocesium and radioiodine in soil particles agitated by agricultural practices: field observation after the Fukushima nuclear accident.
Radiocesium and radioiodine in soil particles agitated by agricultural practices: field observation after the Fukushima nuclear accident.
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农业实践搅动土壤颗粒中的放射性铯和放射性碘：福岛核事故后的现场观察。
DOI：
10.1016/j.scitotenv.2012.02.037
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发表时间：
2012
期刊：
影响因子：
--
通讯作者：
Hirofumi Tsukada
中科院分区：
文献类型：
--
作者：
Noriko Yamaguchi;S. Eguchi;H. Fujiwara;K. Hayashi;Hirofumi Tsukada
在福岛第一核电站事故发生3周后，我们测定了由于农业活动对土壤表面的扰动而从土壤颗粒中逃逸再悬浮的大气粉尘中131 I、134 Cs和137 Cs的放射性浓度。由于锤刀式割草机和旋耕机对土壤颗粒的搅动，131I、134Cs和137Cs的大气浓度增加。粗粒土颗粒主要受土壤表面扰动的影响。对于小于10μm的尘埃粒子，农业设备运行过程中放射性铯的再悬浮因子比本底条件下的再悬浮因子高16倍。耕作前，大多数放射性核素积累在土壤表面几厘米之内。耕作稀释了它们在最上层土壤中的浓度。
Three weeks after the accident at the Fukushima Daiichi Nuclear Power Plant, we determined the activity concentrations of131I,134Cs and137Cs in atmospheric dust fugitively resuspended from soil particles due to soil surface perturbation by agricultural practices. The atmospheric concentrations of131I,134Cs and137Cs increased because of the agitation of soil particles by a hammer-knife mower and a rotary tiller. Coarse soil particles were primarily agitated by the perturbation of the soil surface of Andosols. For dust particles smaller than 10μm, the resuspension factors of radiocesium during the operation of agricultural equipment were 16-times higher than those under background condition. Before tillage, most of the radionuclides accumulated within a few cm of the soil surface. Tillage diluted their concentration in the uppermost soil layer.