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Iodine-131, T1/2 = 8

Question 79

Multiple Choice

Iodine-131, t1/2 = 8.0 days, is used in diagnosis and treatment of thyroid gland diseases. If a laboratory sample of iodine-131 initially emits 9.95 × 1018 particles per day, how long will it take for the activity to drop to 6.22 × 1017 particles per day?


A) 2.0 days
B) 16 days
C) 32 days
D) 128 days
E) none of the above

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