A sample of cerium-141 for a diagnostic test was dissolved in saline solution to an activity of 4.5 millicuries/mL.If the patient undergoing the test needs a dose of 10 millicuries,how much of the solution should be injected into the patient?

Question

Quizplus · Accepted Answer

First, we can use the formula:

Activity = Dose / Volume

where Activity is in millicuries/mL, Dose is in millicuries, and Volume is in mL.

Rearranging the formula, we can solve for Volume:

Volume = Dose / Activity

Plugging in the given values:

Volume = 10 millicuries / 4.5 millicuries/mL = 2.22 mL

Rounding to the nearest tenth, we get:

Volume ≈ 2.2 mL

Therefore, the correct choice is C, which is 2.2 mL.

A Sample of Cerium-141 for a Diagnostic Test Was Dissolved