through the fish-food ingestion pathway are well below current Federal guidelines. 24 refs., 1 fig., 27 tabs Major Descriptors: *AMERICIUM 241 -- RADIOECOLOGICAL CONCENTRATION; *BISMUTH 207 -- RADIOECOLOGICAL CONCENTRATION; *CESIUM 137 -RADIOECOLOGICAL CONCENTRATION; *COBALT 60 -- RADIOECOLOGICAL CONCENTRATION; *FISHES; *PLUTONIUM 238 -- RADIOECOLOGICAL CONCENTRATION ; *PLUTONIUM 239 -- RADIOECOLOGICAL CONCENTRATION; *PLUTONIUM 240 -RADIOECOLOGICAL CONCENTRATION; *STRONTIUM 90 -- RADIOECOLOGICAL CONCENTRATION Descriptors: BIKINI; BIOLOGICAL ACCUMULATION; COMPILED DATA; RADIOACTIVITY; RADIONUCLIDE KINETICS; TISSUE DISTRIBUTION Broader Terms: ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALKALI METAL ISOTOPES; ALKALINE EARTH ISOTOPES; ALPHA DECAY RADIOISOTOPES; AMERICIUM ISOTOPES; ANIMALS; AQUATIC ORGANISMS; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; BETA-PLUS DECAY RADIOISOTOPES; BISMUTH ISOTOPES; CESIUM ISOTOPES; COBALT ISOTOPES; DATA; DISTRIBUTION; ECOLOGICAL CONCENTRATION ; ELECTRON CAPTURE RADIOISOTOPES; EVEN-EVEN NUCLEI; EVEN-ODD NUCLET; HEAVY NUCLEI; INFORMATION; INTERMEDIATE MASS NUCLEI; INTERNAL CONVERSION RADIOISOTOPES; ISLANDS; ISOMERIC TRANSITION ISOTOPES; ISOTOPES; MARSHALL ISLANDS; MICRONESIA; MINUTES LIVING RADIOISOTOPES; NUCLEI; NUMERICAL DATA; OCEANIA; ODD-EVEN NUCLEI; ODD-ODD NUCLEI; PLUTONIUM ISOTOPES; RADIOISOTOPES; STRONTIUM ISOTOPES; VERTEBRATES; YEARS LIVING RADIOISOTOPES Subject Categories: 520300* -- Environment, Aquatic -- Radioactive Materials Monitoring & Transport -- (1989) 560162 -- Radionuclide Effects, Kinetics, & Toxicology -- Animals, Plants, Microorganisms, & Cells 290300 -- Energy Planning & Policy -- Environment, Health, & Safety 290400 -- Energy Planning & Policy -- Energy Resources INIS Subject Categories: B3200* -- Water C2120 -- Radioisotope effects, kinetics, & toxicology in animals, plants & Microorganisms 10/5/440 (Item 140 from file: 103) 02144349 EDB-88-087080 Title: Strontium-isotope stratigraphy of Enewetak Atoll Author(s): Ludwig, K.R.; Halley, R.B.; Simmons, K.R.; Affiliation: Geological Survey, Denver, CO (USA) Source: Geology (United States) v 16:2. Coden: GLGYB Publication Date: Feb 1988 p 173-177 Document Type: Journal Article Language: English Journal Announcement: EDB8805 Subfile: JMT (DOE contractor) Country of Origin: United States Abstract: Peterman, Z.E. /sup 87/Sr//sup 86/Sr ratios determined for samples from a 350 m core of Neogene lagoonal, shallow-water limestones from Enewetak Atoll display a remarkably informative trend. Like the recently published data for Deep Sea Drilling Project (DSDP) carbonates, /sup 87/Sr//sup 86/Sr at Enewetak increases monotonically but not smoothly from the early Miocene to the Pleistocene. The data show intervals of little or no change in /sup 87/Sr//sup 86/Sr, punctuated by sharp transitions to lower values toward greater core depths. The sharp transitions correlate with observed solution disconformities caused by periods of subaerial erosion, whereas the intervals of little or no change in 87/Sr//sup 86/Sr correspond to intervals of rapid accumulation of shallow-water carbonate sediments. /sup When converted to numerical ages using the published DSDP 590B trend, the best-resolved time breaks are at 282 m (12.3 to 18.2 Ma missing) and 121.6 m (3.0 to 5.3 Ma missing) below the lagoon floor. At Enewetak, Sr isotopes offer a stratigraphic resolution; for these shallow-marine Neogene carbonates comparable to that of nadnofossil zonation in deep-sea carbonates (0.3-3 m.y.). In addition, the correlation of times of Sr-isotope breaks at Enewetak with times of rapid Sr-isotope change in the DSDP 590B samples confirms 9003150