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How long will it take so that 99.8% of an initial dose of Tc-99m has decayed? (The half-life of Tc-99m is 6.02 hours. Round your

How long will it take so that 99.8% of an initial dose of Tc-99m has decayed? (The half-life of Tc-99m is 6.02 hours. Round your answer to the nearest whole number.) (ANSWER) hr

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