Mathematics, 29.06.2019 22:00 jjgccc

Atoxic radioactive substance with a density of 9 milligrams per square centimeter is detected in the ventilating ducts of a nuclear processing building that was used 45 years ago. if the half- life of the substance is 20 years, what was the density of the substance when it was deposited 45 years ago?

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Atoxic radioactive substance with a density of 9 milligrams per square centimeter is detected in the...