Radioactive status of seawater in the northwest Pacific more than one year after the Fukushima nuclear accident

被引：60

作者：

Men, Wu ^{[1
]}

He, Jianhua ^{[1
]}

Wang, Fenfen ^{[1
]}

Wen, Yu ^{[1
]}

Li, Yiliang ^{[1
]}

Huang, Jiang ^{[1
]}

Yu, Xingguang ^{[1
]}

机构：

[1] State Ocean Adm, Inst Oceanog 3, Lab Marine Isotop Technol & Environm Risk Assessm, Xiamen 361005, Peoples R China

来源：

SCIENTIFIC REPORTS | 2015年 / 5卷

关键词：

SUBTROPICAL MODE WATER; DISPERSION;

D O I：

10.1038/srep07757

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

To understand the impact of Fukushima Nuclear Accident(FNA), eight cruises were performed from 2011-2014. This paper reports the seawater monitoring results of the third cruise, which was conducted in May-June 2012. The northwest Pacific was clearly influenced even more than one year after FNA. However, compared to the monitoring results of the first and second cruises, which were performed in 2011, the seawater radioactivity of the third cruise decreased greatly. The highest value and the highest average of Cs-137 and Cs-134 were found in the 200 m layer, which suggested that Cs-137 and Cs-134 were most likely transported to a depth of 200 m or deeper. At 21.50 degrees N, 125.00 degrees E, Cs-134 was found at a depth of 200 m, which is 430 km away from the southernmost point of Taiwan Island. The formation and subduction of Subtropical Mode Water is the most reasonable explanation for this process. The coastal water of China was not impacted by the radioactive pollutants released from the FNA. The radiation increments from Cs-137, Cs-134 and Sr-90 are only one-thousandth to one-millionth of the screening rate (10 mu Gy/h) according to the estimation using ERICA tools.

引用

页数：9

共 23 条

[1] Surface pathway of radioactive plume of TEPCO Fukushima NPP1 released 134Cs and 137Cs [J].