Chemical Kinetics and Nuclear ChemistryHard

Question

A sample of 53I131, as I- ion, was administered to a patient in a carrier consisting 1.0 mg of stable I- ion. After 4.0 days. 60% of the initial radioactivity was detected in the thyroid gland of the patient. What mass of the stable I- ion had migrated to the thyroid gland ? Given: t1/2 of I131 = 8 days

Options

A.0.65 mg
B.0.75 mg
C.0.85 mg
D.0.95 mg

Solution

k =


∴  ≈  0.7 ⇒ 70% of the initial activity is present.
Given that 60% activity is migrated to thyroid gland. weight of I- ion migrated to thyroid gland is:
× 100 ≈ 05.7%
i.e., 1.0 mg × = 0.857 mg

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