Technetium-99m Is Used in Medical Diagnosis by Injecting a Solution

question 4

Multiple Choice

Technetium-99m is used in medical diagnosis by injecting a solution and watch for the pattern of emissions. A 0.325 g sample was injected into a person, and the emission rate indicates that there are approximately 0.01016 grams of Tc-99 left. How much time has passed since the injection? Tc-99 has a half-life of 6 hours.

• A)24 hours
• B)30 hours
• C)36 hours
• D)Not enough data.

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