Supported by the National Natural Science Foundation of China (Grant No. 90411016);the National Key Basic Research Special Foundation Program of China (Grant No. 2005CB422305);China Ocean Mineral Resources R& D Association Foundation (Grant Nos. DY105-02-04 and DY105-02-01)
Surface seawater was collected for ^(226)Ra measurement in the North Pacific Subtropical Gyre from July to October, 1999 and October to December, 2003. Combined with the historical data reported for this sea area, a ...