Iodine-131 Has a Half-Life of 8

question 132

Multiple Choice

Iodine-131 has a half-life of 8.1 days and is used as a tracer for the thyroid gland.If a patient drinks a sodium iodide (NaI) solution containing iodine-131, how many days will it take for the concentration of iodine-131 to drop to 5.0% of its initial concentration?

• A)19 days
• B)0.81 day
• C)8.1 days
• D)35 days
• E)4.3 days

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