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The half-life for thorium-227 is 18.72 days. This means that thorium-227 decays In 2 exponentially at a rate of 18.72 per day What fraction of

The half-life for thorium-227 is 18.72 days. This means that thorium-227 decays In 2 exponentially at a rate of 18.72 per day What fraction of its initial radioactivity will remain after 5 days? Round your answer to four decimal places.

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