The recommended dosage of iodine-131 is 21 Ci/5 kg of body mass. How many microcuries of iodine-131 are needed for a 75.0-kg person with hyperthyroidism?

Question

• 1580 Ci
• 17.9 MCi
• 315 Ci
• 1.40 Ci

Answer 1

To calculate the required dosage of iodine-131 for a 75.0-kg person, we use the recommended dosage of 21 Ci/5 kg of body mass.

First, we find the mass of the person in 5 kg intervals:
75.0 kg / 5 kg = 15 intervals

Next, we multiply the recommended dosage by the number of intervals:
21 Ci/5 kg * 15 intervals = 315 Ci

Therefore, the correct answer is:
• 315 Ci