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Technetium-99m (99m Tc) is a radioactive isotope commonly used in medical diagnosis. It emits gamma
rays with a half-life of 6.0058 hours.
A sample with activity 8.5 × 108 Bq is injected into a patient
What percentage of this activity will remain after 28 hours?
Give your answer as a percentage to 1 decimal place.
Percentage of activity remaining:
%

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