October 6, 2015

Homework Help: physics

Posted by andrew on Sunday, June 3, 2012 at 9:02pm.

A building has become accidentally contaminated with radioactivity. The longest-lived material in the building is strontium-90. (The atomic mass of Sr is 89.9077 u.) If the building initially contained 4.8 kg of this substance and the safe level is less than 10.0 counts/min, how long will the building be unsafe? (in years)

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