Physics
Scientific paper
Mar 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980e%26psl..47...51m&link_type=abstract
Earth and Planetary Science Letters, Volume 47, Issue 1, p. 51-64.
Physics
2
Scientific paper
In Funka Bay of Hokkaido, Japan, seawater, suspended matter and settling matter were collected once every month in the summer of 1974. These samples were analyzed for 234Th, a short-lived daughter of dissolved 238U. A pronounced disequilibrium between 234Th and 238U, and a highly variable concentration of 234Th were found. Positive correlation, however, exist among the deficiency of 234Th relative to 238U in seawater, the concentration of particulate 234Th, the fraction of particulate 234Th to total 234Th in seawater, the total dry weight of suspended matter, and the primary productivity during the month previous to sampling. The specific activity of 234Th for the settling particles (620 +/- 170 dpm/g) was nearly equal to that for suspended particles (720 +/- 600 dpm/g) but much greater than that for plankton (47 +/- 24 dpm/g). These facts suggest that suspended particles are somehow closely related to the removal of heavy metals from seawater, in spite of the negligibly small settling flux of suspended matter. The residence time of thorium in Funka Bay (mean depth: 60 m) is found to be about 60 days, which is nearly equal to those of 210Pb and 210Po.
Minagawa Masao
Tsunogai Shizuo
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