A 12 mL sample of an aqueous solution containing `2xx10^(6)` counts per sec of tritium is injected into the blood stream of an animal. After complete circulatory mixing , a 1 mL sample was drawn and found to have an activity of `1.5xx10^(4)` counts . Calculate blood volume of the animal.

Options

A. `1.33 xx 10^(2)` mL
B. `2xx10^(6)` mL
C. `1.5xx10^(4)` mL
D. `2.66xx10^(2)` mL

Answer

A

Explanation

`1.0 xx 10^(4)` counts are in 1 mL volume hence `2xx10^(6)` counts are in `(1xx2xx10^(6))/(1.5xx10^(4))=1.33xx10^(2)` mL.