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A solution containing active cobalt having activity
P of \( 0.8 \mu \mathrm{Ci} \) and decay constant \( \lambda \) is injected in an animal's body. If \( 1 \mathrm{~cm}^{3} \) of blood is drawn from
W the animal's body after \( 10 \mathrm{hrs} \) of injection, the activity found was 300 decays per minute. The volume of blood (in litres) that flowing in the body is
\( \left(1 \mathrm{Ci}=3.7 \times 10^{10}\right. \) decays per second and at \( t=10 \mathrm{hrs}, e^{-\lambda t}=0.84 \) ).
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