Before the use of technetium-99m, patients with high risk coronary artery disease wereevaluated using thallium-201 which has a half-life of 73.00 hours. If a person is exposed to5.000 μg of thallium-201, how many hours would it take to reach 10.00 % of its originalmass?3.322 hours242.5 hours21.98 hours

Answered: Image /qna-images/answer/90ee910d-481e-4d0f-9a8e-8dfe3765778b.jpg

Answered: Before the use of technetium-99m,…

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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A 105.0 nanogram (ng) sample of sodium−24 was stored in a lead-lined cabinet for 2.5 d. How much sodium−24 remained? The half-life of sodium−24 is 15 hours .
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MODULE 5 Potassium ion is present in foods and is an essential nutrient in the human body. One of the naturally occurring isotopes of potassium, potassium-40, is radioactive. Potassium-40 has a natural abundance of 0.0117% and a half-life of 1.28 x 10' yr. It undergoes radioactive decay in three ways: 98.2% is by electron capture, 1.35% is by beta emission, and 0.49% is by positron emission. 1. Write the nuclear equations for the three modes by which K-40 decays. 2. How many K-40 ions are present in 0.76 g of KBr? 3. How long does it take for 7.65% of K-40 in 0.76 g of KBr to undergo radioactive decay?
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Americium-241 is widely used in smoke detectors. Calculate the amount of americium-241 consumed in a smoke detector (initially containing 2.1000 µg of Am), in micrograms, that has been used for 1.000 year if the half-life is 433 years.
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Gallium-67 is used medically in tumor-seeking agents. The half-life of gallium-67 is 78.2 hours. If you begin with 46.2 mg of this isotope, what mass remains after 198 hours have passed? mg
Thallium-201 is used medically to diagnose heart problems. The half-life of thallium- 201 is 72.9 hours. If you begin with 44.3 mg of this isotope, what mass remains after 217 hours have passed? mg

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