a. The recommended dosage of iodine-131 is 4.20 µCi/kg of

Solution 27QPStep 1 of 2a.Here, we have to find the microcuries of iodine- 131 are needed for a 70 kg of patient with hyperthyroidism.Here, the main unit is Ci.Curie(Ci) is the original unit of activity.And it is defined as the number of disintegrations that occur in 1s for 1 g of radium.The given The recommended dosage of iodine-131 is 4.20 µCi/kg of body mass.From the given it is clearly states that 1 kg body mass is equal to 4.20 µCi.Let’s write the conversion factors:1 Kg = 4.20 µCiSo, the conversion factors are and For 70.0 kg body mass:70.0 kg = 294.0µCi.Therefore, 294.0µCi of iodine- 131 are needed for a 70 kg of patient with hyperthyroidism.________________________________________________________________________