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Title: Comparative food-chain behavior and distribution of actinide elements in and around a contaminated fresh-water pond

The bioaccumulation of /sup 233/ /sup 234/U, /sup 238/U, /sup 238/Pu, /sup 239/ /sup 240/Pu, /sup 241/Am, and /sup 244/Cm in both native and introduced biota was studied at Pond 3513, a former low-level radioactive waste settling basin at Oak Ridge National Laboratory. This system, which was decommissioned in 1976 after more than 30 years use, contains approximately 5 Ci of /sup 239/ /sup 240/Pu; inventories of other actinide isotopes are considerably less. Significantly higher concentrations of actinides in fish that were allowed access to sediments indicated that sedimentary particulates may be the primary source of transuranics to biota in shallow fresh-water ecosystems. Our study determined habitat, in particular the degree of association of an organism with the sediment-water interface, to be the primary factor in controlling transuranic concentrations in aquatic biota. In most of the biological samples analyzed, excluding samples suspected of being contaminated by sediment, /sup 241/Am//sup 239/Pu, /sup 244/Cm//sup 239/Pu, and /sup 238/U//sup 239/Pu ratios were greater than the respective ratio in sediment while /sup 233/ /sup 234/U//sup 238/U, and /sup 239/ /sup 240/Pu//sup 238/Pu ratios were not different from the respective ratios in sediment. The relative uptake of actinides from contaminated sediment by aquatic and terrestrialmore » biota at this site was U > Cm greater than or equal to Am > Pu. The relative extractability of actinides from shoreline sediment was U > Cm approx. = Am > Pu; we also observed the same relative ranking for sediment-water exchange in situ. Concentrations of transuranics in water, terrestrial vegetation, and vertebrate carcasses were less than 10% of the recommended public exposure maximum permissible concentration (MPC) of the ICRP.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
6456078
Report Number(s):
CONF-810722-5
ON: DE81026522; TRN: 81-014202
DOE Contract Number:
W-7405-ENG-26
Resource Type:
Conference
Resource Relation:
Conference: International symposium on migration in the terrestrial environment of long-lived radionuclides from the nuclear fuel cycle, Knoxville, TN, USA, 27 Jul 1981
Research Org:
Oak Ridge National Lab., TN (USA)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ACTINIDES; BIOLOGICAL ACCUMULATION; FISHES; UPTAKE; AMERICIUM 241; CURIUM 244; EXPERIMENTAL DATA; PLUTONIUM 238; PLUTONIUM 239; PLUTONIUM 240; PONDS; RADIOECOLOGICAL CONCENTRATION; SEDIMENT-WATER INTERFACES; URANIUM 233; URANIUM 234; URANIUM 238; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; ALPHA DECAY RADIOISOTOPES; AMERICIUM ISOTOPES; ANIMALS; AQUATIC ORGANISMS; CURIUM ISOTOPES; DATA; ECOLOGICAL CONCENTRATION; ELEMENTS; EVEN-EVEN NUCLEI; EVEN-ODD NUCLEI; HEAVY NUCLEI; INFORMATION; INTERFACES; ISOTOPES; METALS; NUCLEI; NUMERICAL DATA; ODD-EVEN NUCLEI; PLUTONIUM ISOTOPES; RADIOISOTOPES; URANIUM ISOTOPES; VERTEBRATES; YEARS LIVING RADIOISOTOPES 520302* -- Environment, Aquatic-- Radioactive Materials Monitoring & Transport-- Aquatic Ecosystems & Food Chains-- (-1987)