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A radioisotope of iodine, 131I, is used to study thyroid function. A patient is given a sample that is 1.7 Ã 10â4 M 131I. If the half-life is 8.04 days, what fraction of the radioactivity remains after 26.0 days? Radioactive decay is a first-order process.

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Americium-241 is used in smoke detectors. It has a first order rate constant for radioactive decay of k = 1.6x10-3 yr -1. By contrast, iodine-125, which is used to test for thyroid functioning, has a rate constant for radioactive decay of k = 0.011 day -1.1. How much of a 1.00 mg sample of americium remains after 4 days?2. How much of a 1.00 mg sample of iodine remains after 4 days?I know the answer I just don't know how to get to the answer, please explain. Thank You

Iodine-131 is a convenient radioisotope to monitor thyroid activity in humans. It is a beta emitter with a half-life of 8.02 days. The thyroid is the only gland in the body that uses iodine. A person undergoing a test of thyroid activity drinks a solution of NaI, in which only a small fraction of the iodide is radioactive. (a) Why is NaI a good choice for the source of iodine? (b) If a Geiger counter is placed near the person’s thyroid (which is near the neck) right after the sodium iodide solution is taken, what will the data look like as a function of time? (c) A normal thyroid will take up about 12% of the ingested iodide in a few hours. How long will it take for the radioactive iodide taken up and held by the thyroid to decay to 0.01% of the original amount?

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Americium-241 is used in smoke detectors. It has a first–order rate constant for radioactive decay of k = 1.6 × 10^-3 yr^-1. By contrast, iodine-125, which is used to test for thyroid functioning, has a rate constant for radioactive decay of k = 0.011 day^-1. (a) What are the half-lives of these two isotopes? (b) Which one decays at a faster rate? (c) How much of a 1.00-mg sample of each isotope remains after 3 half-lives? (d) How much of a 1.00-mg sample of each isotope remains after 4 days?

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A radioisotope of iodine, 131I, is used to study thyroid function. A patient is given a sample that is 1.7 Ã 10â4 M 131I. If the half-life is 8.04 days, what fraction of the radioactivity remains after 26.0 days? Radioactive decay is a first-order process.

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A radioisotope of iodine, 131I, is used to study thyroid function. A patient is given a sample that is 1.7 Ã 10â4 M 131I. If the half-life is 8.04 days, what fraction of the radioactivity remains after 26.0 days? Radioactive decay is a first-order process.

Unlock all answers

Related textbook solutions

Basic Chemistry

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Principles of Chemistry Molecular Approach

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Principles of Chemistry: A Molecular Approach

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A radioisotope of iodine, 131I, is used to study thyroid function. A patient is given a sample that is 1.7 Ã 10â4 M 131I. If the half-life is 8.04 days, what fraction of the radioactivity remains after 26.0 days? Radioactive decay is a first-order process.