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How many mg of Radium-226 will remain after 1000 years?

Customer Question

The half-life of Radium-226 is 1590 years. If a sample contains 200 mg, how many mg will remain after 1000 years? Hint: Recall P=P0ekt where P0 is the initial amount of such a substance, P is the amount at a given time t andk is the exponential rate of decay. What would it mean if P=.5P0?