Synopsis of French experimental and in situ research on the terrestrial and marine behavior of Tc

Journal Article · Tue Aug 01 00:00:00 EDT 1989 · Health Physics; (USA)

DOI:https://doi.org/10.1097/00004032-198908000-00005· OSTI ID:5674353

Masson, M; Patti, F; Colle, C; Roucoux, P; Grauby, A; Saas, A ^[1]

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1. Laboratoire de Radioecologie Marine, Cherbourg (France)

Terrestrial environment studies have been essentially concerned with the evolution of soil deposition and soil-plant transfers. Experimentally determined coefficients of distribution in soils are low: 60-80% of Tc remains hydrosoluble during the first months. Technetium emissions resulting from microbiological activity have been quantified. Antagonistic effects on Mo and Tc retention by soils are dependent on their respective concentrations. Four areas of soil-plant transfers have been studied: (1) root absorption kinetics relative to deposition of Tc, (2) interaction of stable Mo (environmental parameter) with the transfer of Tc to plants, (3) interaction of some long-lived radioisotopes (effluent parameters) with the transfer of Tc to plants, and (4) long-term soil-plant transfer and aging of deposited material. Of aquatic systems, only the marine environment has been studied. Under anoxic conditions in the presence of reducing sediments, the distribution coefficients (Kd) were very high (10(3)). Concentration factors (CF) from water to organisms were generally very low (1 to 10); however, CF greater than 1000 have been observed for some biota such as macrophytic brown algae, worms and lobsters. Biochemical analysis showed that Tc was essentially free and partially bonded to proteins. The transfer factors between sediments and species were very low (TF less than 0.5). The biological half-time was determined in some marine organisms that had accumulated Tc from water, food or sediments; the loss is biphasic. Uptake in edible parts was low. The physiochemical form affects the accumulation and loss of Tc. Analyses have quantified 99Tc in marine fauna and biota in the English Channel in relation with releases of the reprocessing plant of La Hague. Brown algae are the best bioindicators for following 99Tc dispersion in marine ecosystems. 24 references.

• OSTI ID: 5674353
• Journal Information: Health Physics; (USA), Vol. 57:2; ISSN 0017-9078
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
FOOD CHAINS
CONTAMINATION
TECHNETIUM 99
RADIONUCLIDE MIGRATION
ALGAE
ANNELIDS
ANOXIA
AQUATIC ECOSYSTEMS
BIOLOGICAL HALF-LIFE
CRUSTACEANS
FISHES
FRANCE
MOLLUSCS
MOLYBDENUM
RADIOECOLOGICAL CONCENTRATION
RADIONUCLIDE KINETICS
REVIEWS
ROOT ABSORPTION
SEAWATER
SOILS
TERRESTRIAL ECOSYSTEMS
VEGETABLES
WATER POLLUTION
ABSORPTION
ANIMALS
AQUATIC ORGANISMS
ARTHROPODS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
DOCUMENT TYPES
ECOLOGICAL CONCENTRATION
ECOSYSTEMS
ELEMENTS
ENVIRONMENTAL TRANSPORT
EUROPE
FOOD
HOURS LIVING RADIOISOTOPES
HYDROGEN COMPOUNDS
INTERMEDIATE MASS NUCLEI
INVERTEBRATES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MASS TRANSFER
METALS
NUCLEI
ODD-EVEN NUCLEI
OXYGEN COMPOUNDS
PLANTS
POLLUTION
RADIOISOTOPES
TECHNETIUM ISOTOPES
TRANSITION ELEMENTS
UPTAKE
VERTEBRATES
WATER
WESTERN EUROPE
YEARS LIVING RADIOISOTOPES
510300* - Environment
Terrestrial- Radioactive Materials Monitoring & Transport- (-1989)
520300 - Environment
Aquatic- Radioactive Materials Monitoring & Transport- (1989)
560162 - Radionuclide Effects
Kinetics
& Toxicology- Animals
Plants
Microorganisms
& Cells