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8. Patients with Graves disease have an overactive thyroid gland, and are commonly treated with radioactive iodine-131. I 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 I 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 x10¹4 iodine-131 atoms. What is the maximum number of days (round to a whole number) before the pill is no longer usable?

8. Patients with Graves disease have an overactive thyroid gland, and are commonly treated with radioactive iodine-131. I 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 I 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 x10¹4 iodine-131 atoms. What is the maximum number of days (round to a whole number) before the pill is no longer usable?

Chemistry: Principles and Reactions
Chemistry: Principles and Reactions
8th Edition
ISBN:9781305079373
Author:William L. Masterton, Cecile N. Hurley
Publisher:William L. Masterton, Cecile N. Hurley
Chapter18: Nuclear Reactions
Section: Chapter Questions
Problem 54QAP
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Patients with Graves disease have an overactive thyroid gland, and are commonly treated with radioactive iodine-131. I 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 I 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 x10¹4 iodine-131 atoms. What is the maximum number of days (round to a whole number) before the pill is no longer usable?
Transcribed Image Text:Patients with Graves disease have an overactive thyroid gland, and are commonly treated with radioactive iodine-131. I 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 I 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 x10¹4 iodine-131 atoms. What is the maximum number of days (round to a whole number) before the pill is no longer usable?
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