Technetium-99 is used in medicine as a source of radiation. A typical dose is 25 mCi. How

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Technetium-99 is used in medicine as a source of radiation. A typical dose is 25 mCi.
How long does it take for the activity to reduce to 0.100 mCi? The half-life of 99Tc is 210,000 y.
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