OCCURRENCE OF RADIORUTHENIUM IN THE LAVER, PORPHYRA TENERA, AND OTHER SEAWEEDS

The effects of fallout or radioactive materials on the sea biota have been studied by many workers, since a series of weapon tests was held at the South Pacific Ocean.On the radionuclides in sea fishes, existence of i40Ba (140La), 118mCd, 115Cd, 144Ce (144Pr), 57Co , 58Co, 66Cp, "Fe, 59Fe, S4Mn, 90Sr (90Y), 65Zn and 95Zr (95Nb) was confirmed by scientists in Japan and the United States.'However, studies on nuclides in seaweeds were not so developed, and only a few papers are available on this subject.FOLSOM2) determined 12?Cs in a kelp in the Santa Monica Bay, Palaglycus porra, and recognized only a little amount of it.The amount of 90Sr in seaweeds was determined by several workers".",",for this is one of the most important nuclides from the standpoint of public hygiene.A series of works conducted by Bureau of Scientific Technology, Japan, showed that the concentration of 90Sr in the brown algae arised from fallout was higher than that of other sea biota.4)DUNSTER') determined 90Sr and 1o6Ru(1o6Rh) in an edible seaweed in England , Porphyra umbilicalis, and found extremely * Radiological studies on seaweeds-1.