10/5/988 00176782 Author(s): Title: (Item 688 from file: 103) ERA-02-011168; INS-77-001383; EDB-77-014233 Levy, Y.; Miller, D.S.; Friedman, G.M. Fission- and alpha-track study of biogeochemistry of plutonium and uranium in carbonates of Bikini and Enewetak atolls. January 1, 1976--December 31, 1976 Corporate Source: of Geology Publication Date: Report Number(s): Rensselaer Polytechnic Inst., Sep 1976 CO0O-3462-13 Contract Number (DOE): Document Type: Report Language: English Journal Announcement: Troy, Progress report, . N.Y. p 32 (USA). Dept. ; EY-76-S-02-3462 , EDB7701 Availability: Dep. NTIS $4.00. Subfile: INS (US Atomindex input); (Technical Information Center). ERA (Energy Research Abstracts); TIC Country of Origin: United States Country of Publication: United States Abstract: Alpha emitters have been detected with a resolution of a few tens of micrometers using a solid state track detector (cellulose nitrate) to map the activity in a coral sample from Bikini. Calibration methods used include: a Pu source of 0.15 ..mu..Ci in conjunction with polycarbonate and CaCO/sub 3/ absorbers of different thicknesses 30 micrometers), (2 to and a powdered coral sample which had been analyzed previously for alpha emitters by chemical methods in conjunction with an alpha spectrometer. 0.04 mm/sup 3/ can be measured routinely; smaller concentrations can be determined but with a lower resolution. CaCO/sub 3/ of the coral Favites virens from Bikini lagoon was analyzed by placing the detector directly on the sample for thirty days. Sections and thin sections cut perpendicular to one another, but parallel to the direction of coral growth, give very different concentrations and distributions of alpha emitters. Maximum concentrations of 800 pCi/g were measured in a volume of 0.004 mm/sup 3/ in void-filling cement separated from the coral and in an area in which coral skeleton and cement could not be distinguished. Areas of high alpha emitter concentrations coincide with areas of coral growth interruption where non coral material exists that is composed of a mixture of encrusting bryozoan like carbonate material and skeletal debris.; Major Descriptors: *BIKINI -- BIOGEOCHEMISTRY; *ENIWETOK -- BIOGEOCHEMISTRY i; *PLUTONIUM -- BIOGEOCHEMISTRY; *URANIUM -- BIOGEOCHEMISTRY Descriptors: ALPHA PARTICLES; CALCIUM CARBONATES; CORALS; FISSION TRACKS; GROWTH Broader Terms: ACTINIDES; ALKALINE EARTH METAL COMPOUNDS; ANIMALS; CALCIUM COMPOUNDS; CARBON COMPOUNDS; CARBONATES; CHARGED PARTICLES; CHEMISTRY; CNIDARIA; ELEMENTS; GEOCHEMISTRY; INVERTEBRATES; ISLANDS; MARSHALL ISLANDS; METALS; OXYGEN COMPOUNDS; PARTICLE TRACKS; TRANSURANIUM ELEMENTS Subject Categories: 510300* -- Environment, Terrestrial -- Radioactive Materials Monitoring & Transport -- (-1989) 580400 -- Geochemistry INIS Subject Categories: 10/5/989 00155198 Author(s): Title: -- B31* (-1989) -- Land (Item 689 from file: ERA-02-003869; Schell, W.R. 103) INS-76-021294; EDB-76-093509 Biogeochemistry of radionuclides in aquatic environments. progress report, 1975--1976 (Retention of /sup 239/Pu, Annual /sup 240/Pu, and /sup 241/Am in Bikini Lagoon 17-years following nuclear explosions) Corporate Source: Washington Univ., Seattle (USA). Lab. of Radiation Ecology Publication Date: 15 Jan 1976 p 54 Report Number(s): Contract Number Document Type: RLO-2225-T18-18 (DOE): Report E(45-1)-2225-T18 Sb0n OB yu