Iodine-123, Which Is Used for Diagnostic Imaging in the Thyroid

question 52

Multiple Choice

Iodine-123, which is used for diagnostic imaging in the thyroid, has a half-life of 13 hours. If 50.0 mg of I-123 were prepared at 8:00 A.M. on Monday, how many mg remain at 10:00 A.M. on the following day?

• A)3.13 mg
• B)6.25 mg
• C)25.0 mg
• D)12.5 mg
• E)50.0 mg

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