Results of the radiometric analyses of the samples are presented. Results of these analyses indicate that /sup 90/Sr and /sup 137/Cs are predominant in the terrestrial environment and, in addition, /sup 241/Am and /sup 239/ /sup 240/Pu are also important in the soil from Rongelap and Bikini Atols. Naturally occurring /sup 40/K is the predominant radionuclide in marine organisms, while /sup 60/Co is significant in the tridacnid clams. Amounts of radioactivity vary with distance from the Bikini test site and in relation to the fallout pattern from the March 1954 Bravo test. Thus, samples from Bikini Atol had the greatest amounts of radioactivity while the northern islands of Rongelap had slightly lower amounts. The southern islands of Rongelap Atoll and Utirik Atoll had intermediate amounts of radioactivity while Ailuk and Wotje atolls had the least radioactivity of the atolls visited.; Major Descriptors: *AMERICIUM 241 -- RADIATION MONITORING; *AMERICIUM 241 ~- RADIOECOLOGICAL CONCENTRATION; *ANTIMONY 125 -- RADIATION MONITORING ; *ANTIMONY 125 -- RADIOECOLOGICAL CONCENTRATION; *AQUATIC ECOSYSTEMS -- RADIONUCLIDE MIGRATION; *CESIUM 137 -- RADIATION MONITORING; *CESIUM 137 -- RADIOECOLOGICAL CONCENTRATION; *COBALT 60 -- RADIATION MONITORING; *COBALT 60 -- RADIOECOLOGICAL CONCENTRATION; *CRUSTACEANS -~- RADIOACTIVITY; *EUROPIUM 155 -- RADIATION MONITORING; *EUROPIUM 155 -- RADIOECOLOGICAL CONCENTRATION; *FISHES -- RADIOACTIVITY; *MARSHALL ISLANDS -- RADIATION MONITORING; *MARSHALL ISLANDS -- RADIOACTIVITY; *MARSHALL ISLANDS -- RADIOBECOLOGICAL CONCENTRATION; *MARSHALL ISLANDS -- RADIOECOLOGY; *MARSHALIL ISLANDS -- RADIONUCLIDE MIGRATION; *MOLLUSCS -- RADIOACTIVITY; *PLANTS -- RADIOACTIVITY; *PLUTONIUM 239 -- RADIATION MONITORING; *PLUTONIUM 239 -- RADIOECOLOGICAL CONCENTRATION; *PLUTONIUM 240 -- RADIATION MONITORING; *PLUTONIUM 240 -- RADIOECOLOGICAL CONCENTRATION; *POTASSIUM 40 -- RADIATION MONITORING; *POTASSIUM 40 -RADIOECOLOGICAL CONCENTRATION; *SOILS -- RADIOACTIVITY; *STRONTIUM 90 -- RADIATION MONITORING; *STRONTIUM 90 -- RADIOECOLOGICAL CONCENTRATION ; *TERRESTRIAL ECOSYSTEMS -- RADIONUCLIDE MIGRATION; *URANIUM 238 -RADIATION MONITORING; *URANIUM 238 -- RADIOECOLOGICAL CONCENTRATION Descriptors: COMPILED DATA; TABLES Broader Terms: ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALKALI METAL ISOTOPES; ALKALINE EARTH ISOTOPES; ALPHA DECAY RADIOISOTOPES; AMERICIUM ISOTOPES; ANIMALS; ANTIMONY ISOTOPES; AQUATIC ORGANISMS; ARTHROPODS; BETA DECAY RADIOISOTOPES; BETA~MINUS DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; CESIUM ISOTOPES; COBALT ISOTOPES; DATA FORMS; ECOLOGICAL CONCENTRATION; ECOLOGY; ECOSYSTEMS; ELECTRON CAPTURE RADIOISOTOPES; ENVIRONMENTAL TRANSPORT; EUROPIUM ISOTOPES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HEAVY NUCLEI; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; INVERTEBRATES; ISLANDS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; LIGHT NUCLEI; MASS TRANSFER; MICRONESIA; MINUTES LIVING RADIOISOTOPES; MONITORING; NUCLEI; OCEANIA; ODD-EVEN NUCLEI; ODD-ODD NUCLEI; PLUTONIUM ISOTOPES; POTASSIUM ISOTOPES; RADIOISOTOPES; RARE EARTH ISOTOPES; RARE EARTH NUCLEI; STRONTIUM ISOTOPES; URANIUM ISOTOPES ; VERTEBRATES; YEARS LIVING RADIOISOTOPES Subject Categories: 510301* Materials Monitoring & -- Environment, Transport -- Soil Terrestrial -- Radioactive -- (-1987) 510302 -- Environment, Terrestrial -- Radioactive Materials Monitoring & Transport -- Terrestrial Ecosystems & Food Chains -- (-1987) 520302 -- Environment, Aquatic -- Radioactive Materials Monitoring & Transport -- Aquatic Ecosystems & Food Chains -- (-1987) 560172 -- Radiation Effects -- Nuclide Kinetics & Toxicology -- Animals 560173 ~- -- (-1987) -- Radiation Effects -- Nuclide Kinetics & Toxicology -- Plants (-1987) INIS Subject Categories: C22 B31* -- Land -- Radionuclide Ecology C21 -- Tissue Distribution, Radionuclides 10/5/941 00470511 Author(s): Metabolism, (Item 641 from file: 103) INS-79-007169; Nelson, V.A. ERA-04-027871; Toxicology & Removal of EDB-79-044610 Sogugus