Question

5. (15 points) A vial of radioactive waste is disposed of in a municipal landfill, in violation of federal regulations for hazardous waste. If this vial contains 10 mg/L of

a radioactive isotope, how long will it take until the contents of the vial decay to the allowable limit of0.02 mg/L (in years)? The isotope decays at a rate of 10³ d'.

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