From September 1991 through January 1995, partial drawdown of a 1,130-ha U.S. Department of Energy reactor cooling reservoir (Par Pond) in South Carolina exposed sediments contaminated by low-level radiocesium (137Cs).
These exposed sediments were designated as a U.S. Environmental Protection Agency (EPA) superfund site.
Whole-body and muscle concentrations of 137Cs in mourning doves (Zenaida macroura) collected from Par Pond in 1992 and 1993 were 2-3 orders of magnitude higher than in doves from nearby public dove-hunting fields located 12 and 32 km away.
Only 1 of 102 Par Pond doves exceeded the European Economic Community limit of 0.60 Becquerels (Bq) 137Cs/g for fresh meat.
A human risk analysis based on consumption of doves at the observed maximum of muscle 137Cs concentration (0.82 Bq/g wet mass) indicated no more than 41 doves could be consumed by an individual per year at that level before the EPA threshold for action on a superfund site would be exceeded (i.e., further site characterization, possible remedial action).
Levels of whole-body 137Cs in doves from Par Pond declined by>75% from 1992 through 1994.
Pokeweed (Phytolacca americana) seeds, the dominant food of doves foraging on the exposed lake bed, likewise declined (>90%) in 137Cs content over the period.
We noted subtle annual changes in the diets of doves that likely contributed to reduced rates of 137Cs ingestion as the drawdown progressed. (...)
Mots-clés Pascal : Césium, Radioisotope, Pollution radioactive, Accumulation biologique, Gibier, Risque, Homme, Bassin retenue, Caroline du Sud, Etats Unis, Amérique du Nord, Amérique, Milieu eau douce, Zenaida macroura, Aves, Vertebrata, Columbidae
Mots-clés Pascal anglais : Cesium, Radioisotope, Radioactive pollution, Biological accumulation, Game, Risk, Human, Impoundment, South Carolina, United States, North America, America, Freshwater environment, Zenaida macroura, Aves, Vertebrata
Notice produite par :
Inist-CNRS - Institut de l'Information Scientifique et Technique
Cote : 98-0269761
Code Inist : 002A14D05H3. Création : 27/11/1998.