Iodine-131, T_1/2 = 8

question 12

Multiple Choice

Iodine-131, t_1/2 = 8.0 days, is used in the diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 10¹⁸ β particles per day, how long will it take for the activity to drop to 6.22 × 10¹⁷ β particles per day?

• A) 2.0 days
• B) 16 days
• C) 32 days
• D) 128 days
• E) None of the answers is correct.

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