Gamma Emitters in Marine Sediments near the Columbia River

Science  08 Mar 1963:
Vol. 139, Issue 3558, pp. 916-917
DOI: 10.1126/science.139.3558.916


Samples from sediment cores collected at 26 different locations 5 to 35 miles offshore in and around Astoria Submarine Canyon were analyzed for gamma emitters. Chromium-51 and zinc-65 were the principal radio-nuclides found, although several fission products and natural potassium-40 were also present. Radioactivity fell off sharply with distance from the mouth of the Columbia River, indicating that the river serves as a common source of the artificial radionuclides.