Abstract A followup study has been made to assess the concentrations of 23942405, and 13765 in the marine environment of Kwajalein Atoll. Fish collected from the Atoll in 1972 had body burdens of plutonium that were substantially higher than concentrations in similar species from locations contaminated only with global fallout. Our recent results, however, indicated that Kwajalein lagoon seawater contained levels of plutonium more similar to global fallout levels found in north equatorial Pacific surface waters. No satisfactory explanation for the reported plutonium levels in fish from Kwajalein collected in 1972 could be deduced from the available data. The highest plutonium concentrations reported for the 1972 reef species of fish could expose man, through ingestion of marine foods, to a dose rate as high as 25% of the (3 mrad/yr over 70 yrs) proposed EPA guideline for annual total transuranic dose rate to bone. Our present results show the dose rate from the marine food pathway is nearer to 0.005% of the recommended EPA value and are consistent with the view that Kwajalein Atoll contains plutonium concentrations that are expected from global fallout. The magnitude of the plutonium levels reported in fish collected from Kwajalein lagoon during 1972 was excessively high and these results appear to be inconsistent with other environmental data from the lagoon. “Work petfouned under tho auspiees at the US Departnert of Pners bs the Lawrence Livermore Laboratom under contract number WeT4S-ENG-480" pork ARCHIVES