After the release of radioactive material into the atmosphere from a nuclear power plant in a country in 1988, the

After the release of radioactive material into the atmosphere from a nuclear power plant in a country in 1988, the hay in that country was contaminated by a radioactive isotope (half-life 5 days). If it is safe to feed the hay to cows when 12%of the radioactive isotope remains how long did the farmers need to wait to use this hay?

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