1965 Volume 14 Issue 5 Pages 368-373
In order to estimate the behaviour and the distribution of radionuclides in the suspended matter in marine environment, the accumulation and distribution of 55Fe, 59Fe, 60 Co and 89 Sr in the suspended matter in surface seawater sampled at Osaka Bay was studied experimentally by the fractional filtration using Toyo Filter Paper Type No.5A (average pore size 18μ) and four different types of Millipore Filters (Type OS, SM, RA, HA) with different pore sizes. Dry weights, organic and inorganic materials in each fraction were determined.
The radioactive concentration of the seawater was adjusted to about 10-4μc/ml for each nuclide. The results obtained were as follows:
(1) The accumulation of the radioactive nuclides by the suspended matters was observed to reach an equilibrium in about 7-10 days.
(2) The greatest concentration factors per dry weight of radionuclides were obtained in the fraction of large particle sizes recovered by the Toyo Filter Paper Type No.5A. (mean pore size 18μ), rather than in the fractions of relatively small particle sizes.
(3) The distribution of radionuclides in each fraction indicated the tendency that the stronger activity of 60Co was observed in the fraction of large particle sizes, while that of 55Fe in the fraction of small particle sizes.
