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Columbia River Contamination

The first eight nuclear reactors at Hanford used large amounts of water from the Columbia River to cool the reactor cores. The water went through the reactors once, then was returned  to the Columbia River even though it contained radioactive materials. Radioactive materials that built up inside the reactors were also regularly flushed loose and released into the river.

Current Estimates of Radiation Released into the Columbia River by Hanford, 1944-1971
Arsenic-76: 2,500,000 curies
Neptunium-239: 6,300,000 curies
Phosphorus-32: 230,000 curies
Sodium-24: 12,000,000 curies
Zinc-65: 490,000 curies

More: http://www.toxipedia.org/display/wanmec/Hanford+radiation+releases


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