Radioisotopes taken internally for medical a. must be eliminated from the body slowly b. should be fissionable isotopes c. are usually deposited in fat structures d. should have a short half-life

D.Should Have A Short Life

Explanation:

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.