You Inject a 160 Lb Male Patient with 1

Multiple Choice

You inject a 160 lb male patient with 1.0 ml of a saline solution containing a radioactive form of sodium. It has an activity of 5.0 × 10⁴ dpm. After allowing sufficient time for the solution to mix, you remove a 1.0 ml sample of blood and measure its radioactivity. You discover it to have an activity of 11 dpm. What is the patient's blood volume? (Hint: this is similar to a M₁V₁ = M₂V₂ type problem.)

A) 2.2 liters
B) 3.5 liters
C) 4.6 liters
D) 7.0 liters