6 Patients with Graves disease have an overactive thyroid gland, and are commonlytreated with radioactive iodine-131. 1311 has a half-life of 8.0 days. A single such pill hasan activity of 9.9 mCi when freshly made. (a) How many atoms of isotope 13¹1 are in onepill when it is just manufactured? (b)Although the iodine in the pill is constantlydecaying, it is still usable as long as it contains at least 1.1 x10¹ iodine-131 atoms. Whatis the maximum number of days (round to a whole number) before the pill is no longerusable?

Given, Half-life, t1/2=8days Activity, A=9.9mCi The decay constant is given by,…

Patients with Graves disease have an overactive thyroid gland, and are commonly treated with radioactive iodine-131. 131I has a half-life of 8.0 days. A single such pill has an activity of 9.9 mCi when freshly made. (a) How many atoms of isotope 131 are in one pill when it is just manufactured? (b)Although the iodine in the pill is constantly decaying, it is still usable as long as it contains at least 1.1 x10¹ iodine-131 atoms. What is the maximum number of days (round to a whole number) before the pill is no longer usable?

Patients with Graves disease have an overactive thyroid gland, and are commonly treated with radioactive iodine-131. 131I has a half-life of 8.0 days. A single such pill has an activity of 9.9 mCi when freshly made. (a) How many atoms of isotope 131 are in one pill when it is just manufactured? (b)Although the iodine in the pill is constantly decaying, it is still usable as long as it contains at least 1.1 x10¹ iodine-131 atoms. What is the maximum number of days (round to a whole number) before the pill is no longer usable?