Fluorine-18 is a radioactive isotope that decays by positron emission to form oxygen-18 with a half-life of 109.7 min. (A positron is a particle with the mass of an electron and a single unit of positive charge; the equation is SIF 0+e.) Physicians use 18F to study the brain by injecting a quantity of fluoro-substituted glucose into the blood of a patient. The glucose accumulates in the regions where the brain is active and needs nourishment. (a) What is the rate constant for the decomposition of fluorine-18? (b) If a sample of glucose containing radioactive fluorine-18 is injected into the blood, what percent of the radioactivity will remain after 5.59 h? (c) How long does it take for 99.99% of the 18F to decay?

Fluorine-18 is a radioactive isotope that decays by positron emission to form oxygen-18 with a half-life of 109.7 min. (A positron is a particle with the mass of an electron and a single unit of positive charge; the equation is SIF 0+e.) Physicians use 18F to study the brain by injecting a quantity of fluoro-substituted glucose into the blood of a patient. The glucose accumulates in the regions where the brain is active and needs nourishment. (a) What is the rate constant for the decomposition of fluorine-18? (b) If a sample of glucose containing radioactive fluorine-18 is injected into the blood, what percent of the radioactivity will remain after 5.59 h? (c) How long does it take for 99.99% of the 18F to decay?

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...

See similar textbooks

Similar questions

The half life for the radioactive decay of potassium-40 to argon-40 is 1.26× 10⁹ years. Suppose nuclear chemical analysis shows that there is 0.723 mmol of argon-40 for every 1.000 mmol of potassium-40 in a certain sample of rock. Calculate the age of the rock. Round your answer to 2 significant digits. years x10 X
If the amount of radioactive sodium-24, used for studies of electrolytes within the body, in a sample decreases from 0.8 to 0.1 mgmg in 45.0 hh , what is the half-life of sodium-24?
A certain drug has a half-life in the body of 5.5 h. What should the interval between doses be, if the concentration of drug in the body should not fall below 35.% of its initial concentration? Round your answer to 2 significant digits.
The half life for the radioactive decay of carbon-14 to nitrogen-14 is 5.73 × 10³ years. Suppose nuclear chemical analysis shows that there is 0.327 mmol of nitrogen-14 for every 1.000 mmol of carbon-14 in a certain sample of rock. Calculate the age of the rock. Round your answer to 2 significant digits. years. 0 x10 Ś
How long will it take for the intial amount of U-235 to be reduced of this initial amount
How old in years is a bottle of a solution if the deuterium 2H content is 67% that of a new wine? The half-life of deuterium is 1 century. 1. 0.58 yrs 2. 0.85 yrs 3. 58 yrs 4. 85 yrs
A certain drug has a half-life in the body of 7.5 h. What should the interval between doses be, if the concentration of drug in the body should not fall below 25.% of its initial concentration? Round your answer to 2 significant digits.
Archeologists continue to debate the arrival of the first humans in the Western Hemisphere. Radiocarbon dating of charcoal from a cave in Chile was used to establish the earliest date of human habitation in South America as 8700 years ago. This procedure involves comparing the 14C present in a sample of charcoal to the 14C present in a living tree of the same age. What fraction of the 14C initially present remained in the charcoal after 8700 years? The half-life of 14C is 5730 years. (Write the answer as a number with a decimal.)
47. Recently, the skeleton of King Richard III was found under a parking lot in England. If tissue samples from the skeleton contain about 93.79% of the carbon-14 expected in living tissue, what year did King Richard III die? The half-life for carbon-14 is 5730 years.
How old in years is a bottle of a solution if the deuterium 2H content is 67% that of a new wine? The half-life of deuterium is 1 century. 0.85 yrs 58 yrs 85 yrs 0.58 yrs
How old in years is a bottle of a solution if the deuterium 2H content is 67% that of a new wine? The half-life of deuterium is 1 century.
A certain drug has a half-life in the body of 3.0 h. What should the interval between doses be, if the concentration of drug in the body should not fall below 20.% of its initial concentration? Round your answer to 2 significant digits. h X 5