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<-Result less than detection l i m i t ()-Uncertainty f o r r e s u l t. NR-No r e s u l t reported. nra-Not r o u t i n e l y analyzed.

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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 9°Sr from worldwide fallout that enters the Columbia River upstream of Hanford. Irrigation water pumped from the Columbia River can deposit 9°Sr on soil where it can be taken up by farm crops. Fallout has also deposited 9°Sr directly on soil by atmospheric deposition. A review of the sources of 9°Sr in soil in the vicinity of Hanford indicates that about 2% can be attributed to Hanford liquid effluents. PNL measurements of 9°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 9°Sr and is of special interest since it has concentrations higher than other farm crops. The concentrations of 9°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 9°Sr uptake study at Hanford. oo.

No abstract