Abstract
The concentration factors of 106Ru-106Rh and 137Cs for a marine bivalve and a alga were investigated. Furthermore, the transfer ratio ([cpm/g of organism] /[cpm/g of sediment]) of these nuclides from contaminated sediments to organisms was examined. Then the concentration factors were compared with the transfer ratio to know the relative influence of sea water and sediments on the contamination of marine organisms. The obtained figures, we call the biological factor of the sediments (BFS), were 70 and 160 for red alga and bivalve on 137Cs, and 5400 and 2900 for them in case of 106Ru-106Rh, respectively. These figures were comparable to those for annelid worm, 40 on 137Cs and 1000 on 106Ru-106Rh.
