A Patient Was Injected with ¹³¹I on Monday at 10:00

question 42

Multiple Choice

A patient was injected with ¹³¹I on Monday at 10:00 AM.On Tuesday at 10:00 AM, the thyroid probe was placed over the thyroid and produced 100,000 counts.On Thursday at 10:00 AM, the probe showed 25,000 counts.What is the effective half-life in this patient's thyroid?

• A)12 hours
• B)24 hours
• C)48 hours
• D)72 hours

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