Solved: The half-life of radioactive cobalt is 5.27 years.
Chapter , Problem 40(choose chapter or problem)
The half-life of radioactive cobalt is 5.27 years. Suppose that a nuclear accident has left the level of cobalt radiation in a certain region at 100 times the level acceptable for human habitation. How long will it be until the region is again habitable? (Ignore the probable presence of other radioactive isotopes.)
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