Health, 06.08.2019 08:10 kamnicole13
Atoxic radioactive substance with a density of 2 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 2 milligrams per square centimeter is detected in the...
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