Discussion Water Concentrations The average 2394240 Pu concentrations of the lagoon seawater, computed from Table 1, were 0.45 + 0.21 pCi/m® in 1975 and 0.54 + 0.11 pCi/m? in 1976. During these two years the average concentrations of 13765 were 133 + 7 and 138 + 7 pCi/m. There was no significant difference in the average concentrations during these years. average fallout concentrations of In north equatorial surface seawater, 239+240 Pu and 137 were 0.36 + 0.11 and 142 + 10 pci/m, respectively. concentration of 137 Cs during the two years The average Cs in the lagoon is not significantly different from fallout concentrations in the oceanic surface waters which are continuously in exchange with the lagoon. The average concentration of 23942405, in the Open ocean is slightly lower than the lagoon mean concentration but it is within the statistical uncertainty associated with the value. The concentrations of 2394240, u and 137 Cs in surface water collected in 1975 and 1976 at station 5 were essentially identical during the two years. Unlike the levels at station 5, station 1 were different. the 2394240, concentrations at Bottom water from station 1 in 1975 and 1976 surface water contained plutonium levels which were higher than the lagoon average. Station 1 is approximately 100 yards from the remains of the Prinz Eugen, a WW II German cruiser that was used as a target vessel during the Able and Baker nuclear events held at Bikini in 1946, The vessel was towed to Kwajalein after the tests and capsized on the lagoon shelf. Fish collected near the vessel in 1947 showed trace amount of radioactive material in the organisms (Hi 62). It is possible that even after 31 MOF ART VES