核化学与放射化学2017，Vol.39Issue(1)：103-112,10.DOI:10.7538/hhx.2016.YX.2015073
福岛核事故后上海气溶胶中131I、134Cs和137Cs的来源途径分析
Source and Pathway of 131I, 134Cs and 137CS in Aerosols of Shanghai After the Fukushima Nuclear Accident
摘要
Abstract
The typical radionuclides (131I and 134,137Cs) in aerosols could be efficiently used to evaluate the impacts of radioactive materials from the Fukushima nuclear accident on the radioactive background level of the atmosphere in Shanghai and the world.In the present work,combining impact factors,such as the nuclear accident release process,natural radioactive decay and the meteorological conditions,the distribution patterns of 131I and 134,137Cs activities and their ratios in Shanghai aerosols were obtained.The date when 131I (2011-03-27) could be detectable is earlier than 134Cs (2011-04-06) and 137Cs (2011-04-08).The 131I activity (0.01-1.20 mBq/m3) is 2-10 times higher than those of 134Cs (0.01-0.58 mBq/m3) and 137Cs (0.01-0.65 mBq/m3).Moreover,multiple peak values of 131I are found with time series.The activity ratios of 131I/137Cs (1.3-10.6) decrease after the date of April 5th,2011,however,the activity ratios of 134Cs/137Cs (0.8-2.9) are constant to be around 1.1.Using the analytical method of HYSPLIT model,the primary air mass migration pathways of radioaerosols in Shanghai during this accident can be qualitatively inferred as the northeast and northwest paths.Meanwhile,the northeast pathway of radio-aerosols in Shanghai is further confirmed to be dominant by analysis of the reported radio-aerosol data in the concerned cities of China during that time period.In addition,the results of maximum values of 131I/137Cs and 134Cs/137Cs activity ratios are summarized and analyzed to reveal the spreading pathways of radio-aerosols in the northern hemisphere.关键词
气溶胶/131I/137Cs活度浓度比值/134Cs/137Cs活度浓度比值/迁移路径Key words
aerosol/131I/137Cs activity ratio/134Cs/137Cs activity ratio/migration pathway分类
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刘丹彤,王锦龙,毕倩倩,杜金洲..福岛核事故后上海气溶胶中131I、134Cs和137Cs的来源途径分析[J].核化学与放射化学,2017,39(1):103-112,10.基金项目
河口海岸学国家重点实验室基本科研业务费资助项目(2011KYYW04) （2011KYYW04）
