What are some applications of Nuclear Chemistry in Medicine?

So far I've found

- X-rays
- Radioactive tracers
- Gamma radiation can be used to treat cancer and other diseases

X-rays are not a nuclear effect, but your other answers are excellent. You might also want to consider positron emission tomography (PET) - a noninvasive cancerous tissue detection technique.

http://en.wikipedia.org/wiki/Positron_emission_tomography