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The Hanford Nuclear Reservation on the banks of the Colombia River just north of Richland, Washington, has produced 54 million gallons of radioactive plutonium waste over the past half-century. The waste is currently being stored in 177 underground tanks as a watery sludge. Question: How long it will take for the radioactive waste stored in the Hanford Nuclear Reservation to decay to 1% of its current concentration?

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