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Contribution of Hanford liquid effluents to strontium-90 levels in offsite soils

机译:汉福德液体流出物对场外土壤中锶-90水平的贡献

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Strontium-90 is a major constituent of liquid effluents entering the Columbia River at the 100-N Area. The Columbia River also contains (sup 90)Sr from world-wide fallout that enters the Columbia River upstream of Hanford. Irrigation water pumped from the Columbia River can deposit (sup 90)Sr on soil where it can be taken up by farm crops. Fallout has also deposited (sup 90)Sr directly on soil by atmospheric deposition. A review of the sources of (sup 90)Sr in soil in the vicinity of Hanford indicates that about 2% can be attributed to Hanford liquid effluents. PNL measurements of (sup 90)Sr in soil at a background location agree with predicted levels of fallout made by the Federal Radiation Council in 1964. Alfalfa is routinely monitored for (sup 90)Sr and is of special interest since it has concentrations higher than other farm crops. The concentrations of (sup 90)Sr in alfalfa measured in the Hanford vicinity are in the range one would expect, based on measured soil concentrations and using uptake factors from an earlier (sup 90)Sr uptake study at Hanford.

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