The medical uses for sodium 24 have to do with studies of electrolytes within a person's body, according to the World Nuclear Association. Sodium 24 is a radioisotope, which has a half life of around 15 hours.
Sodium 24, which has an atomic mass of 24, emits gamma and beta rays, according to Drugs.com. Atomic mass refers to the total of neutrons and protons in an atom, according to the World Nuclear Association. Radioisotopes of a specific element have different number of neutrons, but the same number of protons. A radioactive isotope can emit beta, gamma or alpha rays. Gamma radiation is a type of electromagnetic radiation. Nuclear medicine utilizes radioactive isotopes for treating a person's ailment or gathering information about a certain organ in a person's body.