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Strontium-85 has a half-life of approximately 64.8 days. To determine how long it takes for the radiation level to drop to one-sixteenth, we need to go through four half-lives, since (1/16 = (1/2)^4). Therefore, it will take about (4 \times 64.8) days, which is approximately 259.2 days for the radiation level of strontium-85 to drop to one-sixteenth of its original level.

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