A radioactive waste contains 2 curies (Ci) of 60Co per liter and 2 mCi of 45Ca per liter. The waste can be discharged only if its total activity does not exceed 20 μCi/L. If the half-life of 60Co is 10.7 min and that of 45Ca is 152 days, determine how long the waste must be stored before it can be discharged

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