Survey of Potential Hanford Site Contaminants in the Upper Sediment for the Reservoirs at McNary, John Day, The Dalles, and Bonneville Dams, 2003

Patton, Gregory W.; Priddy, M; Yokel, Jerel W.; Delistraty, Damon; Stoops, Thomas M.

doi:10.2172/859993

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…Sediment samples collected in 2003 had detectable levels of potassium-40, cobalt-60, strontium-90, cesium-137, europium-152, isotopic uranium, and isotopic plutonium (Patton et al 2005). In general, the values were similar to previously reported concentrations at Priest Rapids Dam (Wells 1994;OHD 1994;Poston et al 2003).…”

Section: Patton Et Al (2002) Survey Of Radiological and Chemical Cosupporting

confidence: 83%

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Summary of Radiological Monitoring of Columbia and Snake River Sediment, 1988 Through 2004

Patton¹,

Dirkes²

2007

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SummaryOperation of the single-pass reactors at the Hanford Site resulted in the deposition of radionuclides, primarily short half-life activation products, to sediment accumulation areas on the Columbia River. Operation of the single-pass reactors ended in 1971, and a number of studies were conducted that documented the rapid decline in the radionuclide inventory in the sediment from the decay of short-lived radionuclides and the deposition of fresh sediment material. For the period from 1975 through 1988, environmental monitoring of Columbia River sediment was limited.From 1988 through 2004, samples of upper-layer sediments from the Columbia River and Snake River were collected under the Hanford Site Surface Environmental Surveillance Project to document concentrations and trends of radionuclides. Low concentrations of potassium-40, cesium-137, uranium isotopes, and plutonium isotopes were detected consistently in sediment samples over the entire sampling period. The concentrations of most radionuclides were similar to values measured upstream of the Hanford Site behind Priest Rapids Dam. For all locations, the concentrations of radionuclides in sediment samples from the Columbia and Snake rivers were below concentrations that would result in a 1-mrem effective dose equivalent to a hypothetical exposed individual using a shoreline exposure scenario (i.e., 500 hr/yr of external dose). The U.S. Department of Energy (DOE) limit for public exposure is 100 mrem/yr. Discerning changes in concentration trends for uranium isotopes in sediment was complicated by the use of different methods for analyzing for the presence of uranium. During the period covered by this report, uranium concentrations had been measured using both low-energy photon spectroscopy (U-LEPS) and alpha energy analysis (U-AEA). The U-LEPS method did not report values for uranium-234 and had higher detection limits for uranium-235, with most uranium-235 results reported as below the detection limit. Radionuclide concentrations in sediment collected from riverbank spring discharges along the Hanford Site shoreline were similar to levels in Columbia River sediment, with one exception-the 300 Area, where the average uranium concentrations were usually two to three times the concentrations measured at Priest Rapids. For all locations, the concentrations of radionuclides in riverbank spring sediment samples were below concentrations that would result in a 1-mrem effective dose equivalent to the hypothetical maximally exposed individual using a shoreline exposure scenario (i.e., 500 hr/yr of external dose), which is below the DOE public exposure limit of 100 mrem/yr.

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Section: Patton Et Al (2002) Survey Of Radiological and Chemical Cosupporting

confidence: 83%

“…The concentrations of total beta, technetium-99, and thorium isotopes were similar to those for the 300 Area near-shore and Vernita Bridge sediment samples. (Patton et al 2005). Sediment samples and adjacent beach sediment (where available) were collected from each pool.…”

Section: Patton Et Al (2002) Survey Of Radiological and Chemical Comentioning

confidence: 99%

Summary of Radiological Monitoring of Columbia and Snake River Sediment, 1988 Through 2004

Patton¹,

Dirkes²

2007

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Chemical and ecotoxicological characterization of Columbia River sediments below the Hanford site (USA)

Delistraty¹,

Yokel²

2007

Ecotoxicology and Environmental Safety

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Survey of Potential Hanford Site Contaminants in the Upper Sediment for the Reservoirs at McNary, John Day, The Dalles, and Bonneville Dams, 2003

Cited by 2 publications

References 6 publications

Summary of Radiological Monitoring of Columbia and Snake River Sediment, 1988 Through 2004

Summary of Radiological Monitoring of Columbia and Snake River Sediment, 1988 Through 2004

Chemical and ecotoxicological characterization of Columbia River sediments below the Hanford site (USA)

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