A small amount of solution containing Na24 radio nucleide with activity A=2×103 dps was administered into blood of a patient in a hospital. After 5 hours, a sample of the blood drawn out from the patient showed an activity of 16 dpm per cc t1/2 for Na24=15 hrs . Find:
a. Volume of the blood in patient.
b. Activity of blood sample drawn after a further time of 5 hrs.