A common isotope used in medical imaging is technetium- 99m, which emits gamma rays. A sample initially

Question:

A common isotope used in medical imaging is technetium- 99m, which emits gamma rays.

A sample initially containing 0.500 mg of technetium-99m is monitored as a function of time. Based on its rate of gamma ray emission, a graph, showing the mass of active technetium-99m as a function of time, is prepared. Study the graph and answer the questions that follow. Mass technetium-99m (grams) 0.6 0.5- 0.4- 0.3 0.2 0.1 0 400 600 Time (minutes) Mass of technitium-99m as a

a. What is the mass of technetium-99m present at 200 minutes?

At 400 minutes?

b. What is the half-life of technetium-99m in minutes? In hours?

c. If a patient is given a 2.0-mg dose of technetium-99m, how much of it is left in the patient’s body after 10 hours? (For this problem, assume that the technetium-99m is not biologically removed from the body.)

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