A small quantity of solution containing 24Na radionuclide (half-life 15 h) of activity 1.0 microcurie is injected into the blood of a person. A sample of the blood of volume 1cm^3 taken after 5 h shows an activity of 296 disintegrations min^−1 . Determine the total volume of blood in the body of the person. Assume that the radioactivity solution mixes uniformly in the blood of the person. (1 curie =3.7×10^10 disintegrations^−1 )