Physics · Oct / Nov 2021 · Paper 11 · Question 38

Technetium-99m is a radioactive isotope used in medical scanning. It is injected into the body and its emissions are detected outside the body. Which characteristics of technetium-99m make it suitable for use in medical scanning?

1. AIt has a long half-life and emits alpha radiation.
2. BIt has a long half-life and emits gamma radiation.
3. CIt has a short half-life and emits alpha radiation.
4. DIt has a short half-life and emits gamma radiation.

As printed in the paper