I always feel sad for the stars that gave their lives as supernovae in order to power our clean energy future, only to be ignored for the "hot new thing" (Sun) in the galactic neighborhood.
You found one of the two good nukes! Smoke detectors and radioluminescent watches.
Exclusions. Nothing in this section shall be construed to prohibit the following:
4. Uses of radioactive material for smoke detectors, light emitting watches and clocks, and other applications not related to the development of nuclear weapons. (Ord. 5784-NS § 4, 1986)
This includes irradiated food (e.g. many spices).