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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

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 x 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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