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A building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90....

A building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90. (The atomic mass of 90 38 Sr is 89.9077 u.) If the building initially contained 9.1 kg of this substance and the safe level is less than 10.1 counts/min, how long will the building be unsafe?

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