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A toxic radioactive substance with a density of 8 milligrams per square centimeter is detected in the ventilating ducts of a nuclear processing building that
A toxic radioactive substance with a density of 8 milligrams per square centimeter is detected in the ventilating ducts of a nuclear processing building that was used 45 years ago. If thehalf- life of the substance is 20 years, what was the density of the substance when it was deposited 45 yearsago?
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