Between 4 and 20 1C in seawater temperature the Ra-226
concentration in the Kuroshio region varies between 7 and
8 dpm/100 kg whereas in waters flowing out of the SCS the Ra-
226 concentration increases from about 8 dpm/100 kg at seawater
temperatures between 16 and 20 1C, to as high as 22 dpm/100 kg
at 4 1C in seawater temperature