. A 120 mg sample of technetium-99 is used for a diagnostic test. If technetium-99 has a half life of 6.0 hours, how many milligrams of the technetium-99 sample remains active 24 hours after the test.
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The half-life of technetium-99 is 6.0 hours. \[ \text{Number of half-lives} = \frac{\text{Total time}}{\text{Half-life}} = \frac{24 \text{ hours}}{6.0 \text{ hours/half-life}} = 4 \] Show more…
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