Technetium-99m is a radioactive isotope that is used in medical scanning. It is introduced into the body by injection, and its emissions are detected from outside the body. Which characteristics of technetium-99m make it suitable for use in medical scanning?
- AIt has a long half-life and emits alpha radiation.
- BIt has a long half-life and emits gamma radiation.
- CIt has a short half-life and emits alpha radiation.
- DIt has a short half-life and emits gamma radiation.