Explain why gamma emitters are often used as medical tracers.

Within Uses of nuclear radiation, this learning objective asks you to explain why gamma emitters are often used as medical tracers. Focus on the approved ideas emitters, often, medical, gamma, used and connect them clearly to Hazards and uses of radioactive emissions and of background radiation. A strong response should state the relevant particle, radiation, isotope, decay, half-life or nuclear-equation idea, then explain how it answers the exact command word. Avoid swapping nearby concepts such as atomic number and mass number, isotope and ion, alpha, beta and gamma radiation, or contamination and irradiation.