Ecological half-life of ¹³⁷Cs in fish from a stream contaminated by nuclear reactor effluents

Journal Article · Fri Dec 01 04:00:00 EST 2000 · Science of the Total Environment, The

DOI:https://doi.org/10.1016/S0048-9697(00)00713-0· OSTI ID:989687

Peles, J ^[1]; BryanJr, A ^[2]; Garten, Jr, Charles T ^[3]; Ribble, D ^[4]; Smith, M ^[2]

---

1. Pennsylvania State University, McKeesport
2. Savannah River Ecology Lab
3. ORNL
4. Trinity University

Radiocesium ({sup 137}Cs) concentrations were determined during 1974, 1981 and 1998 for seven species of fish inhabiting a stream (Steel Creek) contaminated by effluents from a nuclear reactor to examine the decline of this radionuclide in a natural ecosystem. Median {sup 137}Cs concentrations were highest in Micropterus salmoides (largemouth bass) during each year of the investigation (1974 = 6.67 Bq g{sup -1} dry wt. of whole body; 1981 = 3.72 Bq g{sup -1}; 1998 = 0.35 Bq g{sup -1}), but no patterns of differences were observed among Aphredoderus sayanus (pirate perch), Esox americanus (redfin pickerel), Lepomis auritus (redbreast sunfish), L. gulosus (warmouth), L. punctatus (spotted sunfish), and Notropis cummingsae (dusky shiner). Results demonstrated a rapid decline in {sup 137}Cs within fish from Steel Creek during the 24-year period. For example, {sup 137}Cs concentrations in all fish species declined significantly among years, even after accounting for radioactive decay. The observed percent declines in {sup 137}Cs concentrations of individual species were 3-4 times greater between 1974 and 1981 compared to that expected by physical decay alone, and 2-3 times greater during 1981-1998. Ecological half-lives (EHLs) of {sup 137}Cs in fish ranged from 4.43 years in A. sayanus to 6.53 years in L. gulosus. The EHL for {sup 137}Cs in all fish species combined was 5.54 years. Current levels of {sup 137}Cs in fish from Steel Creek (1.16 Bq g{sup -1} dry wt. of whole body to below detection limits) indicate that the consumption of fish from this ecosystem poses little risk to humans and sensitive wildlife species. These results demonstrate the importance of incorporating the concept of ecological half-life into determinations concerning the length and severity of potential risks associated with radiocontaminants.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 989687
• Journal Information: Science of the Total Environment, The, Journal Name: Science of the Total Environment, The Journal Issue: 1-3 Vol. 263; ISSN 0048-9697
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CESIUM 137
DECAY
ECOSYSTEMS
FISHES
HALF-LIFE
RADIOISOTOPES
REACTORS
SENSITIVITY
STEELS
STREAMS