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There is an accident and there remains 100-times the acceptable human tolerance level of Co-60 (a...

There is an accident and there remains 100-times the acceptable human tolerance level of Co-60 (a radioactive cobalt isotope). If the half-life of Co-60 is appr. 5.27 years, how long before the site can be reopened to the public? Assume Co-60 radioactivity follows the standard growth-decay model.

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